CN114930030B

CN114930030B - Scroll member, scroll compressor provided with same, and method for manufacturing scroll member

Info

Publication number: CN114930030B
Application number: CN202080091384.6A
Authority: CN
Inventors: 正木元基; 诸江将吾; 木本贵也
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2024-03-01
Anticipated expiration: 2040-01-07
Also published as: CN114930030A; JP6768991B1; WO2021140567A1; JPWO2021140567A1

Abstract

The scroll member is provided with: a scroll base material having a sliding surface for sliding with other members, the scroll base material being made of an aluminum alloy; and a coating formed on the sliding surface of the scroll base material. The coating layer is provided with: a zinc phosphate layer formed on the sliding surface and containing zinc phosphate particles; a solid lubricant layer formed on the surface of the zinc phosphate layer and containing solid lubricant particles; and a polishing layer formed on the surface of the solid lubricant layer, the polishing layer including a binder and abrasive particles having a Mohs hardness higher than the Mohs hardness of the binder.

Description

Scroll member, scroll compressor provided with same, and method for manufacturing scroll member

Technical Field

The present disclosure relates to a scroll member used in a scroll compressor of an air conditioner or the like, a scroll compressor provided with the scroll member, and a method for manufacturing the scroll member.

Background

A scroll compressor, which is one of scroll fluid machines, has advantages such as high efficiency, high reliability, and noise, as compared with other compressors, and is widely used in refrigeration and air conditioning equipment and other various fields. The scroll compressor includes: a fixed scroll fixed to the frame, and a swing scroll disposed opposite to the fixed scroll. The scroll compressor compresses refrigerant gas by the rotational movement of the scroll, and can achieve higher output by increasing the rotational speed of the scroll.

However, increasing the rotational speed increases the centrifugal force applied to the scroll, which causes problems such as mechanical deformation. Accordingly, as a countermeasure for reducing the weight of the scroll, studies have been actively conducted to change the material from cast iron to an aluminum alloy having a light specific gravity. However, aluminum alloys have a lower melting point and lower surface hardness than cast iron, and thus cause sintering of sliding surfaces during operation. Therefore, in the scroll made of aluminum alloy, it is an object to improve slidability and prevent sintering.

Accordingly, in patent document 1, the following sliding member is disclosed: the sliding property is improved by providing a resin-based coating layer in which a solid lubricant is dispersed on the surface of a sliding member made of an aluminum alloy, and by setting the relative c-axis strength ratio of the solid lubricant in the resin-based coating layer to 85% or more.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2008-95725

Disclosure of Invention

Problems to be solved by the invention

In the coating layer formed on the sliding surfaces of the fixed scroll and the orbiting scroll, if the film thickness is not uniform, a gap is generated between the sliding surfaces to become a leakage flow path of the refrigerant gas, resulting in a decrease in the output of the scroll compressor. Therefore, the thickness of the coating layer is required to be uniform to such an extent that a gap, which is a leakage flow path of the refrigerant gas, is not generated. However, in patent document 1, although a certain effect can be expected in terms of improvement of slidability, there is a problem that the film thickness of the coating layer may become uneven.

The present disclosure has been made to solve the above-described problems, and an object thereof is to provide: a scroll member made of an aluminum alloy, which has excellent sliding properties and can improve uniformity of film thickness of a coating layer; a scroll compressor provided with the scroll member and a method for manufacturing the scroll member.

Means for solving the problems

The scroll member according to the present disclosure includes: a scroll base material having a sliding surface for sliding with other members, the scroll base material being made of an aluminum alloy; and a coating layer formed on the sliding surface of the scroll base material, the coating layer comprising: a zinc phosphate layer formed on the sliding surface and containing zinc phosphate particles; a solid lubricant layer formed on the surface of the zinc phosphate layer and containing solid lubricant particles; and a polishing layer formed on the surface of the solid lubricant layer, the polishing layer including a binder and abrasive particles having a Mohs hardness higher than the Mohs hardness of the binder.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present disclosure, the coating layer is configured to include a zinc phosphate layer, a solid lubricating layer, and a polishing layer, and the abrasive particles of the polishing layer use particles having a higher mohs hardness than the binder of the polishing layer, so that when the sliding surface rubs against the surface of other members, a part of the polishing layer is ground, and thus the uniformity of the film thickness of the coating layer can be improved. Further, since the solid lubricating layer of the base is exposed on the surface of the sliding surface by grinding a part of the grinding layer, the friction coefficient of the sliding surface is reduced, and the sliding property can be improved.

Drawings

Fig. 1 is a schematic cross-sectional view of a compression mechanism unit including a scroll member in embodiment 1.

Fig. 2 is a schematic cross-sectional view of a sliding surface of a scroll member in embodiment 1.

Fig. 3 is a schematic cross-sectional view of a coating layer of a sliding surface of a scroll member in embodiment 1.

Fig. 4 is a schematic cross-sectional view of a coating layer in which a part of a polishing layer of a scroll member is polished and the film thickness is uniform in embodiment 1.

Fig. 5 is a schematic cross-sectional view of a coating layer in which part of the polishing layer and the solid lubricating layer of the scroll member is ground and the film thickness is uniform in embodiment 1.

Fig. 6 is a flowchart showing a method of manufacturing the scroll member according to embodiment 1.

Fig. 7 is a schematic cross-sectional view of the scroll compressor in embodiment 2.

Detailed Description

Hereinafter, a scroll member according to embodiment 1 will be described with reference to the drawings.

Embodiment 1.

Fig. 1 is a schematic cross-sectional view of a compression mechanism unit including a scroll member in embodiment 1. Fig. 2 is a schematic cross-sectional view of a sliding surface of a scroll member in embodiment 1. Fig. 3 is a schematic cross-sectional view of a coating layer of a sliding surface of a scroll member in embodiment 1. Fig. 4 is a schematic cross-sectional view of a coating layer in which a part of a polishing layer of a scroll member is polished and the film thickness is uniform in embodiment 1. Fig. 5 is a schematic cross-sectional view of a coating layer in which a part of a polishing layer and a solid lubricating layer of a scroll member in embodiment 1 is ground and the film thickness is uniform.

The compression mechanism section 18 shown in fig. 1 has a orbiting scroll 2 and a fixed scroll 3. The orbiting scroll 2 and the fixed scroll 3 have sliding surfaces 1a that rub against each other. The orbiting scroll 2 and the fixed scroll 3 each have a sliding surface 1a. The orbiting scroll 2 and the fixed scroll 3 are constituted by the scroll member 1 according to embodiment 1.

The scroll member 1 according to embodiment 1 has a sliding surface 1a that slides with other members. In addition, the scroll member 1 includes, as shown in fig. 2: a scroll base material 1b composed of an aluminum alloy 5, and a coating 9 formed on the sliding surface 1a of the scroll base material 1 b.

The coating 9 has: a zinc phosphate layer 6 formed on the surface of the aluminum alloy 5, a solid lubricating layer 7 formed on the surface of the zinc phosphate layer 6, and a polishing layer 8 formed on the surface of the solid lubricating layer 7. The zinc phosphate layer 6 is a layer composed of zinc phosphate particles 10. The solid lubricant layer 7 is a layer in which scale-like solid lubricant particles 11 are dispersed in a binder 12. The polishing layer 8 is a layer in which abrasive particles 13 are dispersed in a binder 14.

In this way, by forming the polishing layer 8 containing the abrasive particles 13 on the surface of the aluminum alloy 5, even if the thickness of the coating layer 9 is uneven as shown in fig. 3, when the sliding surface 1a rubs against the surface of other members, as shown in fig. 4, a part of the polishing layer 8 is ground, and the thickness of the coating layer 9 becomes uniform. Thus, leakage of refrigerant gas during operation of the compressor can be suppressed. Further, by grinding the polishing layer 8, the solid lubricating layer 7 of the base is exposed on the surface of the sliding surface 1a, and therefore the friction coefficient of the sliding surface 1a is reduced, and the slidability of the surface of the aluminum alloy 5 can be improved.

In addition, as shown in fig. 5, when all of the polishing layer 8 and a part of the solid lubricating layer 7 are ground, more solid lubricating layer 7 is exposed on the surface of the sliding surface 1a, and therefore the friction coefficient of the sliding surface 1a is further reduced, and the slidability of the surface of the aluminum alloy 5 can be further improved. In this case, by properly adjusting the particle diameter and hardness of the abrasive particles 13, the polishing layer 8 and the solid lubricating layer 7 can be easily properly ground when the sliding surfaces 1a rub against each other, and the effect of uniformizing the film thickness can be improved.

The zinc phosphate layer 6 in the scroll member 1 of embodiment 1 is composed of plate-shaped zinc phosphate particles 10, and the zinc phosphate layer 6 is formed by precipitating the plate-shaped zinc phosphate particles 10 so as to be fixed to each other. In this case, from the viewpoint of adhesion to the solid lubricating layer 7, the surface of the zinc phosphate layer 6 is preferably formed in a lattice shape in which the plate-like zinc phosphate particles 10 protrude, as compared with a smooth shape. By forming the shape as described above, the zinc phosphate particles 10 and the solid lubricant particles 11 are easily interlaced with each other at the interface between the zinc phosphate layer 6 and the solid lubricant layer 7, and the adhesion is improved by the anchor effect. Thus, the zinc phosphate particles 10 are preferably plate-shaped, but are not limited to plate-shaped.

The zinc phosphate layer 6 may be a dense film, and even a porous film has no particular problem, and can obtain the same adhesion. The length of the zinc phosphate particles 10 constituting the zinc phosphate layer 6 is not particularly limited, but is preferably 2 μm or more and 15 μm or less, more preferably 3 μm or more and 10 μm or less. When the long diameter of the zinc phosphate particles 10 is smaller than 2 μm, the protrusion of the zinc phosphate particles 10 on the surface of the zinc phosphate layer 6 is small, and thus it is difficult to obtain the above-described anchoring effect. When the length of the zinc phosphate particles 10 exceeds 15 μm, the strength of the zinc phosphate layer 6 decreases, the holding power of the solid lubricating layer 7 decreases, and the adhesion decreases. As will be described later, the ratio of the long diameter of the zinc phosphate particles 10 to the long diameter of the solid lubricant particles 11 is important from the viewpoint of improving the adhesion due to the anchor effect.

The thickness of the zinc phosphate layer 6 is not particularly limited, but is not less than 2 μm and not more than 10 μm, more preferably not less than 3 μm and not more than 6 μm. If the thickness is less than 2 μm, it is difficult to coat the entire surface of the aluminum alloy 5 when fluctuation in thickness occurs, and the base of the aluminum alloy 5 may be exposed. On the other hand, when the thickness of the zinc phosphate layer 6 exceeds 10 μm, peeling may occur due to a shear force applied to the inside of the zinc phosphate layer 6.

The solid lubricant layer 7 in the scroll member 1 of embodiment 1 mainly contains scaly solid lubricant particles 11 and a binder 12. The solid lubricant particles 11 are dispersed in the binder 12, and fixed by the binder 12, thereby forming the solid lubricant layer 7. The solid lubricant particles 11 are preferably contained in an amount of 20% by volume or more and 70% by volume or less, more preferably 30% by volume or more and 60% by volume or less, relative to the solid lubricant layer 7. If the amount of the solid lubricant particles 11 is less than 20% by volume, the amount of the solid lubricant particles 11 exposed on the surface of the solid lubricant layer 7 becomes small, and thus sufficient slidability may not be obtained. On the other hand, if the amount of the solid lubricant particles 11 exceeds 70% by volume, the solid lubricant layer 7 becomes brittle, and the durability of the solid lubricant layer 7 may deteriorate.

The thickness of the solid lubricating layer 7 is not particularly limited, but is preferably 5 μm or more and 60 μm or less, more preferably 10 μm or more and 40 μm or less. If the thickness of the solid lubricating layer 7 is less than 5 μm, it may be difficult to coat the entire surface of the zinc phosphate layer 6 when the in-plane thickness fluctuates, and the surface of the zinc phosphate layer 6 may be exposed. If the thickness of the solid lubricating layer 7 is less than 5 μm, the sliding surfaces 1a may rub against each other, so that a part of the solid lubricating layer 7 may be ground, and as shown in fig. 5, the zinc phosphate layer 6 of the base may be exposed when the film thickness is uniform. On the other hand, if the thickness of the solid lubricating layer 7 exceeds 60 μm, the fluctuation of the in-plane thickness becomes large. Therefore, when the sliding surfaces 1a rub against each other and the polishing layer 8 and a part of the solid lubricating layer 7 are ground, as shown in fig. 4 or 5, a large amount of shavings may be generated when the film thickness is uniform, and the shavings may circulate inside the compressor, thereby causing a problem.

When the microscopic crystal structure of the solid lubricant particles 11 is observed, the layers of the covalently bonded two-dimensional crystals are layered with each other by van der waals bonds, and the layers of the two-dimensional crystals are peeled off during sliding, thereby exhibiting excellent lubricity. In addition, at the interface between the zinc phosphate layer 6 and the solid lubricant layer 7, the zinc phosphate particles 10 and the solid lubricant particles 11 are interlaced with each other, and thus the adhesion is improved.

Here, the state in which the zinc phosphate particles 10 are interlaced with the solid lubricant particles 11 is determined using a photograph taken by enlarging the cross section of the coating layer to 7000 times by an electron microscope (SEM), and is referred to as the following state. Namely, it means: in the above-mentioned photograph, when a straight line parallel to the coating layer forming surface of the aluminum alloy 5 is vertically moved from the surface of the aluminum alloy base material to the surface of the solid lubricating layer 7, a state in which the surface where the zinc phosphate particles 10 and the solid lubricant particles 11 coexist exists on the straight line.

Further, the closer the long diameter of the zinc phosphate particles 10 and the long diameter of the solid lubricant particles 11 are, the stronger the anchoring effect when the particles are interlaced with each other, and the adhesion between the zinc phosphate layer 6 and the solid lubricant layer 7 is further improved. That is, the ratio of the major axis (d 1) of the zinc phosphate particles 10 to the major axis (d 2) of the solid lubricant particles 11 is preferably set to a range of 0.5.ltoreq.d1/d2.ltoreq.2. Here, the long diameter (d 1) of the zinc phosphate particles 10 and the long diameter (d 2) of the solid lubricant particles 11 can be obtained as follows. Several photographs were taken of the cross section of the coating magnified thousands of times using an electron microscope (SEM). Then, the length of each zinc phosphate particle 10 shown in these several photographs is actually measured, and the measured values are averaged to obtain the length of the zinc phosphate particle 10. Similarly, the long diameter of the solid lubricant particles 11 can be obtained by actually measuring the long diameter of each solid lubricant particle 11 shown in the plurality of photographs and averaging the measured values.

As shown in fig. 3, the solid lubricant layer 7 in the scroll member 1 of embodiment 1 has excellent sliding properties and adhesion even in a 1-layer structure, and further improves sliding properties and adhesion by forming it as a 2-layer structure. At this time, the c-plane orientation of the solid lubricant particles 11 of the first layer of the solid lubricant layer 7 formed on the surface of the zinc phosphate layer 6 is preferably smaller than the c-plane orientation of the solid lubricant particles 11 of the second layer. Further, it is more preferable that the c-plane orientation of the solid lubricant particles 11 of the first layer is 50% or less, and the c-plane orientation of the solid lubricant particles 11 of the second layer is 70% or more.

With such a configuration, the solid lubricant particles 11 near the sliding surface 1a are inclined parallel to the sliding surface 1a, so that the layers of the two-dimensional crystals of the solid lubricant particles 11 are easily peeled off during sliding, and the sliding property is improved. Further, since the solid lubricant particles 11 in the vicinity of the zinc phosphate layer 6 are in a state of standing up perpendicularly to the interface with the zinc phosphate layer 6, the zinc phosphate particles 10 and the solid lubricant particles 11 are easily staggered, and the adhesion due to the anchor effect is improved.

The c-plane orientation of the solid lubricant particles 11 can be obtained by measuring the X-ray diffraction pattern of the solid lubricant layer 7. Specifically, each peak of the X-ray diffraction pattern obtained by irradiating the solid lubricating layer 7 with X-rays in the thickness direction is denoted by the miller index (hkl) of the crystal structure. Then, as shown in expression 1, the c-plane orientation of the solid lubricant particles 11 can be evaluated by calculating the ratio of the sum of peak intensities (Σi (00 l)) of the planes (c-plane) perpendicular to the c-axis to the sum of all peak intensities (Σ (hkl)).

c-plane orientation (%) =Σi (00 l)/(c-plane orientation (%)). Sigma I (hkl). Times.100. Cndot.cndot.1

In the solid lubricant layer 7, the larger the proportion of the solid lubricant particles 11 falling parallel to the sliding surface 1a of the solid lubricant layer 7, the larger the value of c-plane orientation becomes, and the total falling becomes 100%.

Among the solid lubricant particles 11 in the scroll member 1 of embodiment 1, particles having a scaly shape and a crystal structure of hexagonal system are preferably used from the viewpoint of improving slidability. By using such particles, the friction coefficient of the sliding surface 1a is reduced and the sliding property is improved due to the lubrication effect caused by the delamination of the two-dimensional crystal of the solid lubricant particles 11 during sliding. The specific solid lubricant particles 11 are not particularly limited, and MoS2, WS2, h-BN, and graphite may be used singly or in combination of two or more. Thus, the solid lubricant particles 11 are preferably in a scale shape, but are not limited to a scale shape.

The polishing layer 8 in the scroll member 1 of embodiment 1 mainly contains the abrasive particles 13 and the binder 14. The abrasive particles 13 are dispersed in the binder 14, and are fixed by the binder 14, thereby forming the polishing layer 8. The abrasive particles 13 are preferably contained in an amount of 20% by volume or more and 70% by volume or less, more preferably 30% by volume or more and 60% by volume or less, relative to the polishing layer 8. If the amount of the abrasive particles 13 is less than 20% by volume, the effect of grinding the polishing layer 8 and the solid lubricating layer 7 may be reduced when the sliding surfaces 1a rub against each other, and the film thickness may not be sufficiently uniform. On the other hand, if the amount of the abrasive particles 13 exceeds 70% by volume, the polishing layer 8 becomes brittle, and when the sliding surfaces 1a rub against each other, the polishing layer 8 may peel off from the solid lubricating layer 7, and a sufficient polishing effect may not be obtained.

The thickness of the polishing layer 8 is not particularly limited, and is preferably thicker than the maximum value of the thickness fluctuation of the solid lubricating layer 7 of the substrate, from the viewpoint of uniformizing the film thickness by the polishing effect when the sliding surfaces 1a are rubbed against each other. If the thickness of the polishing layer 8 is smaller than the maximum value of the thickness fluctuation of the solid lubricating layer 7, the polishing layer 8 may disappear before the film thickness is homogenized by the polishing effect, and the film thickness may not be sufficiently homogenized. Therefore, the thickness (T) of the polishing layer 8 is preferably set to be the maximum thickness (T) of the solid lubricating layer 7 _max ) And the minimum thickness (t _min ) T is greater than or equal to T _max -t _min And the calculated thickness.

Here, the maximum thickness (t _max ) The maximum value is obtained by photographing the cross section of the solid lubricant layer 7 of the sliding surface 1a at 20 by SEM and measuring the thickness of the solid lubricant layer 7 at each portion. In addition, the minimum thickness (t _min ) The minimum value when the solid lubricant layer 7 thickness of each portion was measured by photographing the cross section of the solid lubricant layer 7 of the sliding surface 1a at 20 by SEM. In the scroll member 1 including the polishing layer 8, when the sliding surfaces 1a are rubbed against each other, the polishing layer 8 is first ground, whereby the film thickness is uniformed. At this time, as shown in fig. 4, the solid lubricating layer 7 of the base is partially exposed on the surface, and thus the friction coefficient of the sliding surface 1a is reduced and the sliding property is improved. In addition, when polishing is further performed, as shown in fig. 5, the solid lubricant layer 7 forming the base is completely exposed, the friction coefficient of the sliding surface 1a is further reduced, and the sliding property is further improved.

As means for homogenizing the film thickness by such a polishing effect, after the scroll member 1 is assembled to the compressor, the compressor is experimentally operated to rub the sliding surfaces 1a against each other, whereby the film thickness can be homogenized. However, in this method, there is a possibility that a problem may occur due to circulation of the grinding sludge in the compressor. Therefore, from the viewpoint of avoiding such a problem, it is preferable to unify the film thickness by rubbing the sliding surfaces 1a with each other before the scroll member 1 is assembled in the compressor.

The abrasive particles 13 in the scroll member 1 according to embodiment 1 are particles having a higher mohs hardness than the binder 14 in terms of the polishing of the coating layer 9 and the uniformity of the film thickness.

In the case where the binder 14 used in the coating layer 9 is an organic binder, the mohs hardness is often less than 2.5. Therefore, by using the abrasive particles 13 having a mohs hardness of 2.5 or more, more preferably the abrasive particles 13 having a mohs hardness of 3 or more, a sufficient polishing effect can be obtained, and the film thickness can be made uniform.

In the case where the binder 14 used in the coating layer 9 is an inorganic binder, abrasive particles 13 having hardness equal to or higher than mohs hardness of the inorganic binder used may be used. For example, when a glass-based binder is used, the abrasive particles 13 having a mohs hardness of 5 or more are preferable because the mohs hardness of glass is usually about 5.

On the other hand, if the abrasive particles 13 of the grinding dust are circulated in the compressor, the hardness of the abrasive particles 13 is preferably not excessively high. Specifically, from the viewpoint of preventing the abrasive particles 13 of the shavings from wearing out the components inside the compressor, the mohs hardness is preferably 7 or less, more preferably 6 or less, and still more preferably 5 or less.

The average particle diameter of the abrasive particles 13 is preferably 0.1 μm or more and 5 μm or less, more preferably 0.3 μm or more and 3 μm or less. If the particle diameter of the abrasive particles 13 is smaller than 0.1 μm, it is difficult to uniformly disperse the abrasive particles 13 in the binder 14, and when the polishing layer 8 is formed, a large portion and a small portion of the abrasive particles 13 are generated, and uneven polishing effect is likely to occur. Further, workability in forming the polishing layer 8 is also deteriorated, and productivity is lowered. On the other hand, if the particle diameter of the abrasive particles 13 exceeds 5 μm, the surface of the polishing layer 8 tends to be roughened when the sliding surfaces 1a rub against each other, and thus the effect of suppressing leakage of the refrigerant gas may be reduced.

The average particle diameter of the abrasive particles 13 can be determined as follows. Several photographs were taken of the cross section of the coating magnified thousands of times using an electron microscope (SEM). Then, the particle diameters of the abrasive particles 13 shown in the several photographs are actually measured, and the measured values are averaged, whereby the average particle diameter of the abrasive particles 13 can be obtained.

The binder 12 in the scroll member 1 of embodiment 1 may be an organic binder or an inorganic binder as long as it has a function of dispersing and immobilizing the solid lubricant particles 11. As an index for selecting the binder, heat resistance is given, and the binder having desired heat resistance can be appropriately selected according to the temperature at which the scroll member 1 is used. Further, as an index from another point of view, a load applied to the solid lubricating layer 7 at the time of sliding is given, and it is preferable to select a binder having low hardness for use with a low load and a binder having high hardness for use with a high load. In this way, by selecting the binder according to the applied load, the lubrication effect of the solid lubricant is more easily obtained.

The organic binder is not particularly limited, and examples thereof include epoxy resins, unsaturated polyester resins, phenolic resins, melamine resins, silicone resins, polyimide resins, and the like. Among them, epoxy resins are preferable because of their excellent adhesion. Examples of the epoxy resin include bisphenol a type epoxy resin, bisphenol F type epoxy resin, o-cresol novolac type epoxy resin, phenol novolac type epoxy resin, alicyclic epoxy resin, and glycidyl-aminophenol type epoxy resin. These resins may be used singly or in combination of 2 or more.

In the case of selecting an epoxy resin as the organic binder and using an epoxy resin as the thermosetting resin, the following can be given as examples of the curing agent. Namely, alicyclic acid anhydrides such as methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride and nadic anhydride; aliphatic acid anhydrides such as dodecenyl succinic anhydride; aromatic anhydrides such as phthalic anhydride and trimellitic anhydride; organic dihydrazides such as dicyandiamide and adipic dihydrazide; tris (dimethylaminomethyl) phenol; dimethylbenzylamine; 1, 8-diazabicyclo (5, 4, 0) undecene and derivatives thereof; imidazoles such as 2-methylimidazole, 2-ethyl-4-methylimidazole and 2-phenylimidazole. These curing agents may be used singly or in combination of 2 or more.

The amount of the curing agent to be blended is required to be appropriately set according to the type of the thermosetting resin and the curing agent to be used, and is usually 0.1 parts by mass or more and 200 parts by mass or less with respect to 100 parts by mass of the thermosetting resin.

The solid lubricant layer 7 in the scroll member 1 of the present embodiment may contain a coupling agent from the viewpoint of improving the adhesion of the interface between the solid lubricant particles 11 and the cured product of the thermosetting resin. Examples of the coupling agent include gamma-glycidoxypropyl trimethoxysilane, N-beta (aminoethyl) gamma-aminopropyl triethoxysilane, N-phenyl-gamma-aminopropyl trimethoxysilane, and gamma-mercaptopropyl trimethoxysilane. These coupling agents may be used alone or in combination. The amount of the coupling agent to be blended is required to be appropriately set according to the type of the thermosetting resin and the coupling agent to be used, and is usually 0.01 parts by mass or more and 1 part by mass or less relative to 100 parts by mass of the thermosetting resin.

As the inorganic binder used for the binder 12 of the solid lubricant layer 7, a liquid binder having a good affinity with the solid lubricant particles 11 and being uniformly dispersible is preferable. In addition, the inorganic binder has a higher curing temperature than the organic binder. The curing temperature of the inorganic binder is preferably 250 ℃ or lower, more preferably 200 ℃ or lower, and even more preferably 180 ℃ or lower, from the viewpoints of deterioration of the crystal structure and heat resistance of the zinc phosphate layer 6 due to heat treatment of the aluminum alloy.

By using such an inorganic binder, the solid lubricating layer 7 can be formed without causing a decrease in strength of the aluminum alloy or thermal degradation of the zinc phosphate layer 6. Examples of the inorganic binder include, but are not particularly limited to, sol-gel glass, organic-inorganic hybrid glass, water glass, one-liquid inorganic binder, and two-liquid inorganic binder. They may be used alone or in combination.

The clearance between the sliding surfaces 1a of the scroll member 1 for a compressor needs to be as small as possible from the viewpoint of improving the sealing performance of the refrigerant gas. When the clearance between the sliding surfaces 1a is large in the case of combining the fixed scroll 3 and the orbiting scroll 2 of the scroll member 1, the sealing performance of the refrigerant gas is deteriorated. Therefore, the clearance of the sliding surface 1a is preferably 10 μm or less, more preferably 5 μm or less. If the clearance of the sliding surface 1a of the scroll member 1 is 10 μm or less, even if the clearance is generated in the sliding surface 1a, the oil film of the lubricating oil can replace the gasket to suppress the deterioration of the sealing property.

In the scroll member 1 of the present embodiment, a strong mechanical stress is applied by sliding. Therefore, mechanical strength to such an extent that strain is not generated by the applied mechanical stress is required. Therefore, in the scroll member 1 of the present embodiment, the 0.2% yield strength in the tensile test is preferably 150MPa or more, more preferably 200MPa or more, and still more preferably 300MPa or more. If the 0.2% yield strength in the tensile test has the above-mentioned value, no strain is generated at the time of sliding, and the reliability as a sliding member is high. Here, in the present specification, the value evaluated by the method described in JIS Z2411 is used for the 0.2% yield strength in the tensile test.

In the scroll member 1 of the present embodiment, even if the edge portion is not processed, the sliding property and the adhesion of the coating layer 9 are not adversely affected, but from the viewpoint of the smoothness of the coating layer, it is preferable to perform the curved surface (R) processing or the taper processing. By performing the curved surface (R) processing or the taper processing on the edge portion, burrs of the edge portion generated at the time of manufacturing the scroll are removed, the smoothness of the coating 9 is improved, and the refrigerant gas tightness of the scroll 1 is improved. In this case, the curved surface (R) is preferably R0.5mm or more and R3mm or less.

The taper is preferably not less than 0.5mm and not more than 3 mm. In this specification, R means a radius of a curved surface, and C means a distance from an edge portion. If R and C for processing the edge portion are smaller than 0.5mm, the burr removal at the edge portion may be insufficient, which may prevent the smoothness of the coating layer. On the other hand, when R and C exceed 3mm, the area of the sliding surface 1a becomes small when applied to a sliding member such as the scroll member 1, and the pressure applied during sliding increases.

In the aluminum alloy 5 of the scroll member 1 according to the embodiment, the young's modulus is preferably 70GPa or more from the viewpoint of suppressing deformation due to mechanical stress applied during sliding. The material of the aluminum alloy 5 is not particularly limited, and aluminum alloys for casting, forging, and die casting known in the art can be used. As an example of the aluminum alloy, a metal alloy, examples thereof include Al-Cu-Mg-based alloy, al-Cu-Si-based alloy, al-Si-based alloy Al-Si-Mg alloy, al-Si-Cu alloy, al-Si-Mg alloy, and method for producing the same Al-Si-Cu-Mg alloy, al-Cu-Ni-Mg alloy, al-Si-Cu-Ni-Mg alloy, al-Si-Fe-Cu alloy, and the like.

Method for manufacturing scroll member 1

Fig. 6 is a flowchart showing a method of manufacturing the scroll member according to embodiment 1. A method for manufacturing the scroll member 1 according to embodiment 1 will be described below with reference to fig. 6.

First, an aluminum alloy is machined into a scroll shape. The method of forming the fixed scroll 3 and the orbiting scroll 2 from the aluminum alloy is not particularly limited, and a casting method, a forging method, or a die casting method may be used. As a subsequent step, a surface grinding treatment may be applied to an aluminum alloy formed into a shape of a scroll (hereinafter referred to as a scroll base material). By performing the surface grinding treatment, the smoothness and dimensional accuracy of the surface can be improved. Next, the surface of the scroll base material is degreased using an alkali cleaner or the like, and after the degreasing treatment, the surface of the scroll base material is cleaned by washing with water.

(step of forming Zinc phosphate layer (step S1))

The surface of the cleaned scroll base material, which is the sliding surface 1a, is immersed in the zinc phosphate treatment liquid, whereby zinc phosphate particles 10 are precipitated as crystals. Then, the scroll base material is washed with water and dried, whereby a zinc phosphate layer 6 containing zinc phosphate particles 10 is formed on the surface of the scroll base material. The zinc phosphate treatment liquid is not particularly limited, and commercially available products can be used. The immersion time in the zinc phosphate treatment solution may be appropriately adjusted so as to obtain a desired thickness of the zinc phosphate layer 6 and a desired long diameter (d 1) of the zinc phosphate particles 10, and is, for example, about 1 to 10 minutes. The temperature of the zinc phosphate treatment solution is about 60-80 ℃. When the temperature of the zinc phosphate treatment solution is too low, the precipitation reaction of the zinc phosphate particles 10 cannot be promoted. On the other hand, when the temperature of the zinc phosphate treatment liquid is too high, zinc phosphate particles 10 precipitate in the treatment liquid, and formation of the zinc phosphate layer 6 on the surface of the aluminum alloy 5 is inhibited.

(step of applying solid lubricant paste (step S2))

Next, the solid lubricant particles 11 are mixed and dispersed in the binder 12 diluted with the solvent at a predetermined ratio, thereby preparing a solid lubricant paste. The method of mixing and dispersing the solid lubricant particles 11 is not particularly limited, and examples thereof include a method using a kneader, a ball mill, a planetary ball mill, a kneading mixer, a bead mill, or the like. The binder 12 used here is preferably selected appropriately in consideration of the curing treatment temperature described later.

Further, the viscosity of the solid lubricant paste is preferably the following: when the solid lubricant paste is applied to the surface of the zinc phosphate layer 6, the solid lubricant particles 11 flow or settle, and the zinc phosphate particles 10 are in a state of being interlaced. Specifically, the solid lubricant paste preferably has a viscosity of 10pa·s or less, and more preferably has a viscosity of 5pa·s or less.

The solvent used for diluting the binder 12 is not particularly limited, and examples thereof include phenols such as cresol, polar solvents such as N-methyl-2-pyrrolidone, N' -dimethylformamide, 1, 3-dimethylimidazolidinone, 4-morpholinecarboxaldehyde, aromatic hydrocarbons such as xylene and toluene, ketones such as methyl ethyl ketone, methyl isobutyl ketone, γ -butyrolactone, and δ -valerolactone, and the like.

Next, a solid lubricant paste was applied to the surface of the zinc phosphate layer 6 formed on the surface of the aluminum alloy 5 so as to be of a uniform thickness. The method of applying the solid lubricant paste is not particularly limited, and examples thereof include a spray method, a dipping method, a brush coating method, a screen printing method, a transfer method, and the like. The thickness of the coating film may be inversely calculated from the dry shrinkage and the cure shrinkage of the solid lubricant paste, and appropriately adjusted so that the thickness of the dried and cured solid lubricant layer 7 becomes a desired thickness.

(step of removing solvent (step S3))

Next, the coating film of the obtained solid lubricating paste is heated to a temperature at which the solvent evaporates, thereby removing the solvent. The heating method is not particularly limited, and there may be mentioned a method using a drying oven, a hot plate, a hot air blower, an electric furnace, a high-frequency heating furnace, or the like. The heating temperature may be appropriately adjusted in consideration of the boiling point of the solvent to be used, and is preferably set to a temperature several tens of degrees lower than the boiling point, for example.

When heated to a temperature exceeding the boiling point of the solvent, the solvent rapidly evaporates, and crater-like pores are formed in the coating film, which tends to cause uneven thickness. Further, the rising flow of the solvent vapor generated from the inside of the coating film increases the proportion of the solid lubricant particles 11 in a state parallel to the thickness direction of the coating film near the surface of the coating film, and thus becomes a factor of decreasing the sliding property. On the other hand, when heating to a temperature extremely lower than the boiling point of the solvent, a long time is required until the solvent is removed, and productivity is lowered.

(step of forming solid lubricating layer (step S4))

Next, the solvent-removed coating film is heated to a temperature at which the binder 12 is cured, whereby the solid lubricant layer 7 including the binder 12 and the solid lubricant particles 11 is formed on the surface of the zinc phosphate layer 6. The heating method is not particularly limited, and examples thereof include a method using a drying oven, a hot plate, a hot air blower, an electric furnace, a high-frequency heating furnace, and the like. In addition, the curing temperature of the adhesive 12 to be used can be appropriately adjusted in consideration of the curing temperature. From the viewpoints of deterioration of the crystal structure of the aluminum alloy and heat resistance of the zinc phosphate layer 6 due to the heat treatment, the temperature at which the binder 12 is cured is preferably 250 ℃ or less, more preferably 200 ℃ or less, and even more preferably 180 ℃ or less.

In the case where the solid lubricant layer 7 has a two-layer structure, the step of applying the solid lubricant paste and the step of removing the solvent may be repeated 2 times, and then the step of curing the binder 12 may be performed 1 time to form the solid lubricant layer 7. The step of applying the solid lubricant paste, the step of removing the solvent, and the step of curing the binder 12 to form the solid lubricant layer 7 may be repeated 2 times to form the solid lubricant layer 7 in a two-layer structure.

(step of applying abrasive paste (step S5))

Next, abrasive particles 13 are mixed and dispersed in a binder 14 diluted with a solvent at a predetermined ratio, to prepare an abrasive paste. The method for mixing and dispersing the abrasive particles 13 is not particularly limited, and examples thereof include a method using a kneader, a ball mill, a planetary ball mill, a kneading mixer, a bead mill, or the like. The binder 14 used here is preferably selected appropriately in consideration of the curing treatment temperature described later.

Further, the viscosity of the polishing agent paste is not particularly limited, but is preferably a viscosity such that the polishing agent paste can be uniformly applied to the surface of the solid lubricating layer 7. Specifically, the polishing paste preferably has a viscosity of 10pa·s or less, and more preferably has a viscosity of 5pa·s or less. The solvent used for diluting the binder 14 is not particularly limited, and examples thereof include phenols such as cresol, polar solvents such as N-methyl-2-pyrrolidone, N' -dimethylformamide, 1, 3-dimethylimidazolidinone, 4-morpholinecarboxaldehyde, aromatic hydrocarbons such as xylene and toluene, ketones such as methyl ethyl ketone, methyl isobutyl ketone, γ -butyrolactone, and δ -valerolactone, and the like.

Next, the abrasive paste was applied to the surface of the solid lubricating layer 7 so as to be a uniform thickness. The method of applying the abrasive paste is not particularly limited, and examples thereof include a spraying method, a dipping method, a brush coating method, a screen printing method, a transfer method, and the like. The thickness of the coating film can be calculated inversely from the drying shrinkage and curing shrinkage of the polishing agent paste, and can be appropriately adjusted so that the thickness of the polishing layer 8 after drying and curing becomes a desired thickness.

(step of removing solvent (step S6))

Next, the coating film of the obtained abrasive paste is heated to a temperature at which the solvent evaporates, thereby removing the solvent. The heating method is not particularly limited, and examples thereof include a method using a drying oven, a hot plate, a hot air blower, an electric furnace, a high-frequency heating furnace, and the like. In addition, the heating temperature may be appropriately adjusted in consideration of the boiling point of the solvent to be used, and for example, it is preferable to heat to a temperature several tens of ℃ lower than the boiling point. When heated to a temperature exceeding the boiling point of the solvent, the solvent rapidly evaporates, and crater-like pores are formed in the coating film, and the thickness is also liable to become uneven. On the other hand, when heating to a temperature extremely lower than the boiling point of the solvent, a long time is required until the solvent is removed, and productivity is lowered.

(step of Forming polishing layer (step S7))

Next, the solvent-removed coating film is heated to a temperature at which the binder 14 is cured, whereby the polishing layer 8 including the binder 14 and the abrasive particles 13 is formed on the surface of the solid lubricant layer 7. The heating method is not particularly limited, and examples thereof include a method using a drying oven, a hot plate, a hot air blower, an electric furnace, a high-frequency heating furnace, and the like. In addition, the curing temperature of the adhesive 14 to be used can be appropriately adjusted in consideration of the curing temperature. The temperature at which the binder 14 is cured is preferably 250 ℃ or less, more preferably 200 ℃ or less, and even more preferably 180 ℃ or less, from the viewpoints of deterioration of the crystal structure of the aluminum alloy 5 and heat resistance of the zinc phosphate layer 6 due to heat treatment.

With the above, the coating 9 can be formed.

< simulation test >)

Next, a simulation test for verifying the effect of the sliding property and the film thickness uniformity of the scroll member 1 according to embodiment 1 will be described. In the present simulation test, a test piece was prepared, which was subjected to the same coating as the coating 9 applied to the scroll member 1 according to embodiment 1, and evaluated. Specifically, test pieces of examples 1 to 8 and test pieces of comparative examples 1 to 3 were prepared, and simulation tests for evaluating slidability, adhesion, and uniformity of film thickness were performed on the respective test pieces.

Table 1 is a table summarizing abrasive particles used in the simulation test. Table 2 is a table summarizing the results of the simulation test performed on the test pieces of examples 1 to 8 and the test pieces of comparative examples 1 to 3.

TABLE 1

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Example 1

The zinc phosphate layer 6 was formed on the surface of the ADC14, which was an aluminum alloy, by chemical phosphoric acid treatment so as to have a thickness of about 4.2 μm. At this time, the conditions of the phosphoric acid treatment were adjusted so that the length of the zinc phosphate particles 10 became about 4.5. Mu.m. Next, a solid lubricant layer 7 in which MoS2 particles having a length of about 5 μm were dispersed in an epoxy resin at a ratio of 60% by volume was formed on the surface of the zinc phosphate layer 6 so as to have a thickness of about 16 μm.

The curing condition of the epoxy resin of the solid lubricating layer 7 was 180℃for 2 hours. Next, abrasive particles 13 of No. f in table 1 were dispersed in an amount of 55 vol% in the polishing layer 8 of epoxy resin so as to have a thickness of about 25.2 μm on the surface of the solid lubricant layer 7. The curing condition of the epoxy resin of the polishing layer 8 was 180℃for 2 hours. Thus, a test piece for evaluating the sliding property and adhesion of the coating 9 formed on the aluminum alloy 5 was obtained. Further, a test piece for evaluating uniformity of film thickness of a coating layer formed on the aluminum alloy (ADC 14) of the scroll shape was obtained in the same manner as described above.

Example 2

Test pieces were obtained in the same manner as in example 1, except that the thickness of the zinc phosphate layer 6 was changed to 4.7. Mu.m, the thickness of the solid lubricating layer 7 was changed to 15.8. Mu.m, the type of the abrasive particles 13 was changed to No. C in Table 1, and the thickness of the polishing layer 8 was changed to 27.4. Mu.m.

Example 3

Each test piece was obtained in the same manner as in example 1, except that the thickness of the zinc phosphate layer 6 was changed to 3.8 μm, the thickness of the solid lubricating layer 7 was changed to 17.1 μm, the type of the abrasive particles 13 was changed to No. h of table 1, and the thickness of the polishing layer 8 was changed to 31 μm.

Example 4

Test pieces were obtained in the same manner as in example 1, except that the thickness of the zinc phosphate layer 6 was changed to 5.0. Mu.m, the thickness of the solid lubricating layer 7 was changed to 15.4. Mu.m, the type of the abrasive particles 13 was changed to No. I in Table 1, and the thickness of the polishing layer 8 was changed to 26.6. Mu.m.

Example 5

Test pieces were obtained in the same manner as in example 1, except that the thickness of the zinc phosphate layer 6 was changed to 3.9. Mu.m, the thickness of the solid lubricating layer 7 was changed to 18.0. Mu.m, the type of the abrasive particles 13 was changed to No. J in Table 1, and the thickness of the polishing layer 8 was changed to 33.2. Mu.m.

Example 6

Test pieces were obtained in the same manner as in example 1, except that the thickness of the zinc phosphate layer 6 was changed to 4.1. Mu.m, the thickness of the solid lubricating layer 7 was changed to 19.3. Mu.m, the type of the abrasive particles 13 was changed to No. D in Table 1, and the thickness of the polishing layer 8 was changed to 29.1. Mu.m.

Example 7

Test pieces were obtained in the same manner as in example 1, except that the thickness of the zinc phosphate layer 6 was changed to 4.4. Mu.m, the thickness of the solid lubricating layer 7 was changed to 18.5. Mu.m, the type of the abrasive particles 13 was changed to No. E in Table 1, and the thickness of the polishing layer 8 was changed to 25.6. Mu.m.

Example 8

Test pieces were obtained in the same manner as in example 1, except that the thickness of the zinc phosphate layer 6 was changed to 4.5. Mu.m, the thickness of the solid lubricating layer 7 was changed to 15.7. Mu.m, the type of the abrasive particles 13 was changed to No. G in Table 1, and the thickness of the polishing layer 8 was changed to 27.8. Mu.m.

Comparative example 1

Test pieces were obtained in the same manner as in example 1, except that the thickness of the zinc phosphate layer 6 was changed to 4.7. Mu.m, the thickness of the solid lubricating layer 7 was changed to 18.4. Mu.m, the type of the abrasive particles 13 was changed to No. A in Table 1, and the thickness of the polishing layer 8 was changed to 26.7. Mu.m.

Comparative example 2

Test pieces were obtained in the same manner as in example 1, except that the thickness of the zinc phosphate layer 6 was changed to 3.6. Mu.m, the thickness of the solid lubricating layer 7 was changed to 17.2. Mu.m, the type of the abrasive particles 13 was changed to No. B in Table 1, and the thickness of the polishing layer 8 was changed to 29.3. Mu.m.

Comparative example 3

Each test piece was obtained in the same manner as in example 1, except that the zinc phosphate layer 6 was not formed on the surface of the aluminum alloy (ADC 14), the thickness of the solid lubricating layer 7 was 19.1 μm, the type of the abrasive particles 13 was No. f in table 1, and the thickness of the abrasive layer 8 was 28.0 μm.

Here, as an evaluation of slidability, the seizure resistance by the pin-and-disc method was evaluated. The evaluation results of "slidability (sintering resistance)" in table 2 are based on the evaluation results of the sintering resistance obtained with the test piece of example 1. The test pieces of each example and each comparative example were used to obtain the same evaluation results of the sintering resistance as those of example 1, and the test pieces were slightly inferior but within the allowable range were defined as "Δ", and those that were slightly inferior and outside the allowable range were defined as "x".

Further, as the adhesion of the coating layer 9, the peel strength of the film by the saics method was measured. The evaluation results of the "adhesion (peel strength)" in table 2 are based on the evaluation results of the peel strength obtained with the test piece of example 1. The test pieces of each example and each comparative example were evaluated for peel strength equal to those of example 1, and the test pieces were evaluated for peel strength slightly inferior but within the allowable range, and were evaluated for peel strength slightly inferior and outside the allowable range, respectively.

Further, the uniformity of the film thickness of the coating layer 9 was evaluated as follows. That is, each test piece of the shape of the scroll was assembled into a compressor for evaluation, and after the compressor was operated for 1 hour, the test piece of the shape of the scroll was taken out. Then, the coating thickness of each portion of the sliding portion of the test piece was calculated from the SEM images of the sections at 20, and the difference between the maximum value and the minimum value of the film thickness was calculated, thereby evaluating the film thickness uniformity. The evaluation results of "uniformity of film thickness (thickness fluctuation)" in table 2 were based on the evaluation results of uniformity of film thickness obtained with the test piece of example 1, and the evaluation results of uniformity of film thickness obtained with the test piece of each example or each comparative example were equal to the evaluation results of example 1, and were "o", slightly worse but within the allowable range was "Δ", and the case relatively worse and outside the allowable range was "x".

As is clear from table 2, the test pieces of examples 1 to 8, in which abrasive particles having a higher mohs hardness than the epoxy resin having a mohs hardness of 2.5 used as the binder were used, were excellent in uniformity of film thickness in the sliding portion. It is also known that the aluminum alloy has excellent sintering resistance and adhesion of the coating, and can be used as a coating of aluminum alloy. In particular, it is known that: the test pieces of examples 1 to 5 and examples 7 to 8, in which the abrasive particles 13 had a particle diameter of 0.18 to 4.7 μm, were high in uniformity of film thickness and excellent in slidability.

On the other hand, in the test pieces of comparative examples 1 and 2 using soft abrasive particles 13 having a mohs hardness of 1 to 2, the polishing effect of the polishing layer 8 was not obtained because the polishing was difficult to be polished, and thus the uniformity of the film thickness was very poor. And learn: since the solid lubricant layer 7 of the base is not exposed on the sliding surface 1a, the sliding property is also poor. However, in comparative example 2, since h-BN having solid lubricity was used in the abrasive particles 13, the slidability was slightly inferior to that of example 1. In addition, for comparative example 3, it is known that: since the zinc phosphate layer 6 is not formed on the surface of the aluminum alloy, the anchoring effect of the solid lubricating layer 7 is not maintained, and the adhesion between the zinc phosphate layer 6 and the solid lubricating layer 7 is remarkably poor. In this way, the solid lubricating layer 7 peels off from the zinc phosphate layer 6 at the time of sliding because of poor adhesion. Therefore, in comparative example 3, the effects of improving the uniformity of film thickness due to the polishing effect and improving the slidability due to the solid lubricating layer 7 were not obtained.

< Effect >

The scroll member 1 of embodiment 1 includes: a scroll base material 1b having a sliding surface 1a that slides with another member, and made of an aluminum alloy; and a coating 9 formed on the sliding surface 1a of the scroll base material 1 b. The coating 9 includes: a zinc phosphate layer 6 formed on the sliding surface 1a and containing zinc phosphate particles 10; a solid lubricant layer 7 formed on the surface of the zinc phosphate layer 6 and containing solid lubricant particles 11; and a polishing layer 8 formed on the surface of the solid lubricant layer 7, the polishing layer including a binder 14 and abrasive particles 13 having a Mohs hardness higher than the Mohs hardness of the binder 14.

Thus, the scroll member 1 having excellent sliding properties and improved uniformity of the film thickness of the coating 9 can be provided. As a result, the scroll member 1 can be provided which can prevent the occurrence of seizing and also can prevent the decrease in output due to the leakage of the refrigerant gas.

The abrasive particles have a Mohs hardness of 3 to 7. The abrasive particles have an average particle diameter of 0.1 μm or more and 5 μm or less. Further, the solid lubricant particles 11 are scale-shaped.

This can further improve slidability and uniformity of the film thickness of the coating 9.

The solid lubricant particles 11 are composed of at least 1 of MoS2, WS2, h-BN, and graphite.

Thus, as the solid lubricant particles 11, at least 1 of MoS2, WS2, h-BN, graphite can be used.

The zinc phosphate particles 10 are plate-shaped.

This can improve the adhesion between the zinc phosphate layer 6 and the solid lubricating layer 7, and can suppress the peeling of the solid lubricating layer 7 from the zinc phosphate layer 6 during sliding.

The adhesive 14 of the polishing layer 8 is an organic adhesive or an inorganic adhesive.

As the binder 14 of the polishing layer 8, an organic binder or an inorganic binder can be used.

The method for manufacturing the scroll member 1 according to embodiment 1 includes: a step of immersing the sliding surface 1a of the scroll base material 1b made of the aluminum alloy 5 in a zinc phosphate treatment liquid to form a zinc phosphate layer 6 containing zinc phosphate particles 10 on the sliding surface 1 a. The method for manufacturing the scroll member 1 includes: a step of applying a solid lubricant paste containing a binder 12, solid lubricant particles 11 and a solvent to the surface of the zinc phosphate layer 6; a step of heating the scroll base material 1b coated with the solid lubricant paste to remove the solvent by evaporation; and a step of heating the scroll base material 1b from which the solvent has been removed to cure the binder 12, thereby forming the solid lubricating layer 7 on the surface of the zinc phosphate layer 6. The method for manufacturing the scroll member 1 further includes: a step of applying an abrasive paste containing a binder 14, abrasive particles 13 having a higher mohs hardness than the binder 14, and a solvent to the surface of the solid lubricating layer 7; a step of heating the scroll base material 1b coated with the polishing paste to remove the solvent of the polishing paste by evaporation; and a step of heating the scroll base material 1b from which the solvent of the polishing paste has been removed, and curing the binder 14 of the polishing paste to form the polishing layer 8 on the surface of the solid lubricating layer 7.

Thus, the scroll member 1 having excellent sliding properties and improved uniformity of the film thickness of the coating 9 can be produced with high productivity. As a result, the scroll member 1 can be provided which can prevent the occurrence of seizing and also can prevent the decrease in output due to the leakage of the refrigerant gas.

Embodiment 2.

In fig. 7, the scroll compressor 15 is a so-called vertical scroll compressor, and compresses and discharges a fluid such as a refrigerant gas, for example. The scroll compressor 15 includes: a closed container 16; a compression mechanism unit 18 that is housed in the closed casing 16 and compresses a fluid flowing into the closed casing 16; a motor 21 that generates a rotational force; and a drive shaft 22 that transmits the rotational force generated by the motor 21 to the compression mechanism portion 18. The closed vessel 16 is formed in a cylindrical shape, for example, and has pressure resistance. A suction pipe 23 for taking in the fluid into the sealed container 16 is connected to a side surface of the sealed container 16, and a discharge pipe 24 for discharging the compressed fluid to the outside of the sealed container 16 is connected to the other side surface.

The compression mechanism 18 includes the orbiting scroll 2, the fixed scroll 3, and an oldham mechanism 17 for preventing rotation of the orbiting scroll 2. The motor 21 includes a stator 19 and a rotor 20. The drive shaft 22 is supported by a fixed frame 25 and an auxiliary frame 26.

In the scroll compressor 15 according to embodiment 2, the orbiting scroll 2 and the fixed scroll 3 are constituted by the scroll member 1 according to embodiment 1. The scroll member 1 is constituted of an aluminum alloy as described above, and is therefore light in weight as compared with cast iron. Therefore, the centrifugal force applied to the orbiting scroll 2 during the operation of the compressor can be reduced.

In addition, the coating 9 applied to the surface of the aluminum alloy 5 improves the sliding property. Further, by making the film thickness of the coating 9 uniform, leakage of the refrigerant gas is suppressed. Therefore, the rotation speed of the orbiting scroll 2 can be increased, the compression efficiency of the refrigerant gas can be improved, and the output of the scroll compressor 15 can be increased. The method of assembling the scroll member 1 in the closed casing 16 of the scroll compressor 15 is not particularly limited, and may be performed according to a known method.

As described above, according to embodiment 2, since the fixed scroll 3 and the orbiting scroll 2 are constituted by the scroll member 1 according to embodiment 1, the sliding surface 1a portion is excellent in sliding property, and a scroll compressor capable of preventing the sliding surface from being sintered can be provided. In addition, embodiment 2 can provide a scroll compressor as follows: that is, since the uniformity of the film thickness of the coating layer 9 can be ensured, the leakage of the refrigerant gas is excellent, and the decrease in output due to the leakage of the refrigerant gas can be prevented.

[ description of reference numerals ]

A 1 scroll member, a 1a sliding surface, a 1b scroll member base material, a 2 swing scroll member, a 3 fixed scroll member, a 5 aluminum alloy, a 6 zinc phosphate layer, a 7 solid lubrication layer, an 8 grinding layer, a 9 coating layer, 10 zinc phosphate particles, 11 solid lubricant particles, 12 binder, 13 abrasive particles, 14 binder, 15 scroll compressor, 16 closed container, 17 oldham mechanism, 18 compression mechanism part, 19 stator, 20 rotor, 21 motor, 22 drive shaft, 23 suction piping, 24 discharge piping, 25 fixed frame, 26 auxiliary frame.

Claims

1. A scroll member comprising:

a scroll base material having a sliding surface for sliding with other members, the scroll base material being made of an aluminum alloy; and

a coating formed on the sliding surface of the scroll base material,

the coating layer is provided with:

a zinc phosphate layer formed on the sliding surface and containing zinc phosphate particles;

a solid lubricant layer formed on the surface of the zinc phosphate layer and containing solid lubricant particles; and

a polishing layer formed on the surface of the solid lubricant layer, the polishing layer including a binder and abrasive particles having a Mohs hardness higher than the Mohs hardness of the binder,

the thickness T of the grinding layer is the maximum thickness T of the solid lubricating layer _max And a minimum thickness t of the solid lubricating layer _min T is greater than or equal to T _max -t _min And the calculated thickness.

2. The scroll member according to claim 1, wherein the abrasive particles have a mohs hardness of 3 or more and 7 or less.

3. The scroll member according to claim 1 or 2, wherein the abrasive particles have an average particle diameter of 0.1 μm or more and 5 μm or less.

4. The scroll member according to claim 1 or 2, wherein the solid lubricant particles are scaly.

5. The scroll member according to claim 1 or 2, wherein the solid lubricant particles are composed of at least 1 of MoS2, WS2, h-BN, graphite.

6. The scroll member according to claim 1 or 2, wherein the zinc phosphate particles are plate-shaped.

7. The scroll member according to claim 1 or 2, wherein the binder is an organic binder or an inorganic binder.

8. A scroll compressor includes a compression mechanism unit having a orbiting scroll and a fixed scroll for compressing a fluid,

the orbiting scroll and the fixed scroll are constituted by the scroll member according to any one of claims 1 to 7.

9. A method of manufacturing a scroll member, comprising:

Immersing a sliding surface of a scroll base material made of an aluminum alloy in a zinc phosphate treatment liquid, and forming a zinc phosphate layer containing zinc phosphate particles on the sliding surface;

a step of coating a solid lubricant paste containing a binder, solid lubricant particles and a solvent on the surface of the zinc phosphate layer;

a step of heating the scroll base material coated with the solid lubricant paste and removing the solvent by evaporation;

a step of heating the scroll base material from which the solvent has been removed to cure the binder, thereby forming a solid lubricating layer on the surface of the zinc phosphate layer;

a step of applying an abrasive paste containing a binder, abrasive particles having a higher mohs hardness than the binder, and a solvent to the surface of the solid lubricating layer;

a step of heating the scroll base material coated with the abrasive paste, and removing the solvent of the abrasive paste by evaporation; and

a step of heating the scroll base material from which the solvent of the abrasive paste has been removed, solidifying the binder of the abrasive paste, and forming a polishing layer on the surface of the solid lubricating layer, the polishing layer having a maximum thickness t of the solid lubricating layer _max And a minimum thickness t of the solid lubricating layer _min T is greater than or equal to T _max -t _min And the calculated thickness T.

10. The method for producing a scroll member according to claim 9, wherein abrasive particles having a mohs hardness of 3 or more and 7 or less are used as the abrasive particles.

11. The method for producing a scroll member according to claim 9 or 10, wherein the abrasive particles have an average particle diameter of 0.1 μm or more and 5 μm or less.

12. The method for manufacturing a scroll member according to claim 9 or 10, wherein as the solid lubricant particles, scaly solid lubricant particles are used.

13. The method for manufacturing a scroll member according to claim 9 or 10, wherein at least 1 of MoS2, WS2, h-BN, graphite is used for the solid lubricant particles.

14. The method for manufacturing a scroll member according to claim 9 or 10, wherein plate-shaped zinc phosphate particles are used as the zinc phosphate particles.

15. The method for manufacturing a scroll member according to claim 9 or 10, wherein an organic binder or an inorganic binder is used as the binder.