CN217948236U - Device for preparing intermetallic compound coating - Google Patents
Device for preparing intermetallic compound coating Download PDFInfo
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- CN217948236U CN217948236U CN202221892234.8U CN202221892234U CN217948236U CN 217948236 U CN217948236 U CN 217948236U CN 202221892234 U CN202221892234 U CN 202221892234U CN 217948236 U CN217948236 U CN 217948236U
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Abstract
The utility model discloses a device for preparing intermetallic compound coating, including heating furnace body, temperature control device, vacuum pump and spraying equipment, be provided with the heating unit in the heating furnace body, the heating unit is connected with the temperature control device electricity, and the top symmetric connection of heating furnace body has a pair of spraying equipment, and the inner chamber and the vacuum pump intercommunication of heating furnace body, the work piece is treated in the intracavity setting of heating furnace body. The utility model discloses can prepare intermetallic compound on metal parts surface, combine together with hot spraying equipment, two spray guns can work respectively, also can work simultaneously, can spray different metal powder, through changing two kinds of metal powder's composition and spraying speed, can obtain the bimetal coating that has multilayer structure, also can obtain the bimetal coating that two kinds of metal particles mix together, can generate multiple intermetallic compound in situ in the coating; the vacuum pump can pre-vacuumize the spraying bin, so that the coating and the spraying powder are prevented from being oxidized and polluted during heating.
Description
Technical Field
The utility model relates to a technical field of coating preparation especially relates to a device for preparing intermetallic compound coating.
Background
The preparation technology of the material surface coating is widely applied to various industries at present, and the surface coating can greatly improve the performance and the service life of a workpiece. Wear-resistant, corrosion-resistant, heat-resistant and oxidation-resistant coatings obtained by adopting various coating preparation technologies are widely adopted in the industries of chemical industry, mining, smelting, aviation, aerospace and the like. Thermal spraying is one of the common methods in which material surface coatings are prepared, with the most common types being plasma spraying, electric arc spraying, supersonic flame spraying, oxyacetylene flame spraying, and the like. At present, various metal coatings, ceramic coatings, composite material coatings, functional material coatings and the like can be prepared by adopting the thermal spraying technology.
The intermetallic compound is a new material which is more and more emphasized in recent years, has higher strength and lower density, has good performances of high temperature resistance, oxidation resistance and the like, and has obtained some applications in the fields of aviation, aerospace and the like, for example, the intermetallic compounds of Ti-A1 series and Ni-Al series are used as structural materials on many parts of aerospace. If the intermetallic compound coatings can be prepared on the surfaces of parts in the industries of aviation, aerospace, smelting and the like, the method is a significant work for improving the high-temperature service performance and prolonging the service life of the parts. For example, the Ni-Al compound coating is prepared on the surface of the titanium alloy, so that the problem of reduction of high-temperature oxidation resistance of the titanium alloy at the temperature of more than 650 ℃ can be solved, and the titanium alloy can be used for a long time under the high-temperature working condition. However, current coating preparation techniques also present significant difficulties in preparing intermetallic coatings. For example, when Ni-Al and Ti-Al coatings are prepared by thermal spraying, the arc flame temperature is too high, and if NiAl and TiAl compound powders are directly sprayed, the problems of burning loss and decomposition are relatively serious, and a coating structure with uniform components and no pollution cannot be obtained. In addition, the bonding strength between the coating prepared by the method and the metal matrix is low, and the requirement of industrial use is difficult to meet.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a device for preparing intermetallic compound coating to solve the problem that above-mentioned prior art exists, can the various intermetallic compounds of normal position generation in the coating.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides a device for preparing intermetallic compound coating, including heating furnace body, temperature control device, vacuum pump and spraying equipment, be provided with the heating unit in the heating furnace body, the heating unit with the temperature control device electricity is connected, the top symmetric connection of heating furnace body has a pair ofly spraying equipment, the inner chamber of heating furnace body with the vacuum pump intercommunication, the work piece is treated in the intracavity setting of heating furnace body.
Preferably, the heating furnace body comprises a furnace shell, a heating unit and a two-dimensional moving platform, the heating unit is arranged on the furnace shell in the circumferential direction, the two-dimensional moving platform is arranged at the bottom of the furnace shell, and the two-dimensional moving platform is used for setting the workpiece to be processed.
Preferably, the bottom of the furnace shell is provided with a heat preservation layer, the top of the furnace shell is detachably provided with a sealing cover, and the sealing cover is provided with an air vent.
Preferably, the heating unit comprises a ceramic furnace body and a plurality of resistance wires, the ceramic furnace body is cylindrical, the resistance wires are uniformly distributed along the circumferential direction, and the resistance wires are electrically connected with the temperature control device.
Preferably, the two-dimensional moving platform comprises a transverse moving platform and a longitudinal moving platform, the transverse moving platform is arranged above the longitudinal moving platform, and the transverse moving platform and the longitudinal moving platform are both screw rod sliding nut mechanisms.
Preferably, a thermocouple is arranged in the cavity of the heating furnace body and is electrically connected with the temperature control device.
Preferably, the spraying equipment comprises a spraying gun, a powder feeder and a protective gas cylinder, the spraying gun is respectively communicated with the powder feeder and the protective gas cylinder through pipelines, the protective gas in the protective gas cylinder is argon, and the same or different spraying powders are arranged in the two powder feeders.
Preferably, the spraying equipment is one of plasma spraying equipment, electric arc spraying equipment, supersonic speed flame spraying equipment and oxyacetylene flame spraying equipment.
The utility model discloses for prior art gain following technological effect:
the device of the utility model is a special equipment for preparing intermetallic compounds on the surface of metal parts, and the device is combined with thermal spraying equipment, two spraying guns can work respectively and simultaneously, and can spray different metal powders, and by changing the components and spraying speed of the two metal powders, a bimetallic coating with a multilayer structure can be obtained, and a bimetallic coating with two metal particles mixed together can also be obtained, and multiple intermetallic compounds can be generated in situ in the coating; the vacuum pump can pre-vacuumize the spraying cabin, and ensures that the coating and the spraying powder are not oxidized and polluted when being heated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an apparatus for producing an intermetallic compound coating layer according to the present invention;
FIG. 2 is a schematic view of the internal structure of the heating furnace body of the present invention;
FIG. 3 is a schematic view of the structure of the ceramic furnace body of the present invention;
FIG. 4 is a cross-sectional view of a compound coating of the present invention sprayed with a Ni-Al bimetallic coating that was not made hot;
FIG. 5 is a cross-sectional view of a Ni-Al intermetallic coating layer prepared by spray heating of a compound coating layer according to the present invention;
wherein: 1-heating furnace body, 2-temperature control device, 3-vacuum pump, 4-spraying equipment, 5-workpiece to be processed, 6-furnace shell, 7-ceramic furnace body, 8-resistance wire, 9-heat preservation layer, 10-sealing cover, 11-air exhaust hole, 12-air exhaust hole, 13-spraying gun, 14-mechanical seal, 15-mounting cover, 16-thermocouple, 17-lead screw, 18-sliding nut, 19-transverse moving platform and 20-longitudinal moving platform.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model aims at providing a device for preparing intermetallic compound coating to solve the problem that prior art exists, make and to generate various intermetallic compounds in situ in the coating.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Example 1:
as shown in fig. 1 to 3: the embodiment provides a device for preparing intermetallic compound coating, including heating furnace body 1, temperature control device 2, vacuum pump 3 and spraying equipment 4, be provided with the heating unit in the heating furnace body 1, the heating unit is connected with temperature control device 2 electricity, and the top symmetric connection of heating furnace body 1 has a pair of spraying equipment 4, and the inner chamber and the 3 intercommunications of vacuum pump of heating furnace body 1, the intracavity setting of heating furnace body 1 treats processing work piece 5. Wherein, the vacuum pump 3 can pre-vacuumize the spraying bin of the inner cavity of the heating furnace body 1 through the air exhaust hole 11, so as to ensure that the coating and the spraying powder are not oxidized during spraying.
The heating furnace body 1 comprises a furnace shell 6, a heating unit and a two-dimensional moving platform, wherein the heating unit is arranged on the furnace shell 6 in the circumferential direction, the two-dimensional moving platform is arranged at the bottom of the furnace shell 6, and the two-dimensional moving platform is used for setting a workpiece 5 to be processed. The bottom of the furnace shell 6 is provided with a heat preservation layer 9, the top is detachably provided with a sealing cover 10, and the sealing cover 10 is provided with an air vent 12. The heating unit includes ceramic furnace body and resistance wire 8, and ceramic furnace body 7 is the tube-shape and has a plurality of resistance wire 8 along the circumference equipartition, and resistance wire 8 is connected with temperature control device 2 electricity, can make the spraying storehouse inside by the bulk heating to make ceramic furnace body 7 can keep warm under the uniform temperature for a long time, under high temperature, can take place chemical reaction between two kinds of metals, form intermetallic compound, thereby obtain the intermetallic compound coating that the normal position grows. The two-dimensional moving platform comprises a transverse moving platform 19 and a longitudinal moving platform 20, the transverse moving platform 19 is arranged above the longitudinal moving platform 20, the transverse moving platform 19 and the longitudinal moving platform 20 are both screw rod sliding nut mechanisms, a screw rod 17 penetrates through the furnace shell 6 and passes through a mechanical seal 14, and a handle for adjustment is arranged at the tail end of the screw rod 17. A thermocouple 16 is arranged in the cavity of the heating furnace body 1, and the thermocouple 16 is electrically connected with the temperature control device 2.
The spraying equipment 4 comprises a spraying gun 13, powder feeders and a protective gas cylinder, the spraying gun 13 is installed on the sealing cover 10 through an installation cover 15, the spraying gun 13 is communicated with the powder feeders and the protective gas cylinder through pipelines respectively, some spraying equipment 4 further comprises a power supply, the spraying gun 13 is electrically connected with the power supply, the protective gas in the protective gas cylinder is argon, and the same or different spraying powders are arranged in the two powder feeders. The spraying equipment 4 is one of plasma spraying equipment, electric arc spraying equipment, supersonic flame spraying equipment and oxyacetylene flame spraying equipment.
The specific use process of the device of the embodiment is as follows: before starting the operation, the sealing cover 10 is first opened; the transverse moving platform 19 and the longitudinal moving platform 20 are adjusted to proper positions through the handle adjusting screw rod 17; the workpiece 5 to be processed, on which the coating is to be prepared, is placed on the platform 19, and then the sealing lid 10 is closed. And starting the vacuum pump 3, vacuumizing the spraying cabin in advance, and closing the vacuum pump 3 when the vacuum degree reaches a preset required value. Then, two spraying devices 4 are started, and the preparation of the bimetallic coating is completed by two spraying guns 13 according to the component requirements of the prepared coating. The two spray guns 13 can work simultaneously or sequentially, and the types of the spray materials and the spray speed used by the spray guns are controlled by the powder feeders on the two spray devices 4. The working gas and the powder feeding gas used by both spraying devices 4 are required to be argon. The purpose of pre-vacuumizing the spraying bin is to pump out air in the spraying bin to form a certain vacuum degree, so that the oxidation of oxygen in the spraying bin on spraying particles and a coating is prevented. After the spray gun 13 starts to work, the vacuum degree of the spray cabin does not need to be maintained continuously because argon is fed, and the air vent 12 is opened after the fed gas reaches a certain amount. Because the pressure in the spraying cabin is already higher than the ambient pressure at this moment, the argon gas will be discharged to the atmosphere from the air release hole 12, and the argon gas is converted into the environment protected by the argon gas in the spraying cabin. By controlling the working time of the two spray guns 13, the thickness of the coating produced can be controlled. In the coating preparation process, the movement of the transverse moving platform 19 and the longitudinal moving platform 20 is controlled by adjusting the screw 17, so that the coating can be uniformly distributed on the upper surface of the workpiece 5 to be processed, and a coating with uniform thickness is formed. According to the requirements of the phase transition temperature and the forming time of the intermetallic compound, when the thickness of the coating reaches the preset requirement, the temperature control device 2 is started to electrify the resistance wire 8 in the ceramic furnace body 7, and the interior of the spraying bin is integrally heated. According to the temperature measured by the thermocouple 16, when the temperature of the spraying cabin reaches the requirement of the preset phase transition temperature, the temperature control device 2 starts to preserve the heat of the spraying cabin, and the heat preservation time is determined according to the pre-designed intermetallic compound coating preparation process. The heating of the spraying bin can be carried out after the coating is completely prepared, or can be carried out while spraying, and is carried out according to the process requirements for preparing the coating. When the spraying is finished, the two spraying devices 4 are stopped, and the air vent 12 is closed. And finally, after the heating process is finished, stopping the heating furnace, opening the sealing cover 10 after the temperature in the spraying bin is reduced to the normal temperature, and taking out the workpiece with the prepared intermetallic compound coating.
Example 2:
this example utilizes the apparatus of example 1 to produce a Ni-Al intermetallic coating on the surface of a Ti workpiece: the internal dimensions of the spray booth, the equipment used, were 500mm (length) x 500mm (width) x 350mm (height). The heating furnace has the power of 90kW and the heating temperature range of 0-1000 ℃. The vacuum pump 3 adopts a ZJP-150 Roots vacuum pump before sprayingThe vacuum degree of the spraying cabin is required to be within the range of (5.5-6.5) multiplied by 10 -4 hPa. The spray devices 4 used in the test were plasma spray devices. (Praxair 3710) the spray powder used in the apparatus was pure Ni powder with a particle size of 15-48 μm. The other spraying device 4 is an electric arc spraying device (XDP-5), and the used spraying material is industrial pure aluminum wire with the diameter of 2mm and the purity of more than 99.8 percent. The workpiece 5 to be machined was prepared using pure titanium TA1, the composition of which is shown in table 1 below.
TABLE 1 chemical composition of pure titanium workpieces (mass fraction,%)
At first to the work piece carry out sand blasting, then, utilize the utility model provides a device utilizes first spraying equipment 4 to spray pure Ni layer earlier on the workpiece surface, adopts second spraying equipment 4 spraying pure Al layer on pure Ni layer afterwards for form the double-deck coating of Al/Ni on the titanium plate, the spraying parameter is as shown in following table 2, table 3.
TABLE 2 plasma spraying Process parameters
TABLE 3 arc spraying Process parameters
According to the preparation process of the Ni-Al compound coating, after the Ni coating and the Al coating are completely prepared, the coating is heated under the protection of argon, the heating temperature is 800 ℃, and the heat preservation time is 5 hours.
The coating preparation is completed by using the device of the embodiment, and if only the pre-vacuum and argon protection are performed and the heating furnace is not started for heating, the prepared coating is a Ni and Al bimetal layered coating, and the structure of the coating is shown in FIG. 4. If the heating is carried out using a heating furnace,when the temperature was 800 ℃ and the holding time was 5 hours, the coating structure obtained was as shown in FIG. 5, and it can be seen that a coating containing NiAl was obtained 3 And Ni 2 Al 3 A coating of an intermetallic compound.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (8)
1. An apparatus for producing an intermetallic coating, characterized by: the heating furnace comprises a heating furnace body, a temperature control device, a vacuum pump and spraying equipment, wherein a heating unit is arranged in the heating furnace body, the heating unit is electrically connected with the temperature control device, the spraying equipment is symmetrically connected to the upper part of the heating furnace body, the inner cavity of the heating furnace body is communicated with the vacuum pump, and a workpiece to be processed is arranged in the inner cavity of the heating furnace body.
2. The apparatus for producing an intermetallic compound coating layer according to claim 1, characterized in that: the heating furnace body comprises a furnace shell, a heating unit and a two-dimensional moving platform, wherein the heating unit is arranged on the furnace shell in the circumferential direction, the two-dimensional moving platform is arranged at the bottom of the furnace shell, and the two-dimensional moving platform is used for setting the workpiece to be processed.
3. The apparatus for producing an intermetallic compound coating layer according to claim 2, characterized in that: the bottom of the furnace shell is provided with a heat preservation layer, the top of the furnace shell is detachably provided with a sealing cover, and the sealing cover is provided with an air vent.
4. The apparatus for producing an intermetallic compound coating layer according to claim 2, characterized in that: the heating unit comprises a ceramic furnace body and resistance wires, the ceramic furnace body is cylindrical, the resistance wires are evenly distributed along the circumferential direction, and the resistance wires are electrically connected with the temperature control device.
5. The apparatus for producing an intermetallic compound coating layer according to claim 2, characterized in that: the two-dimensional moving platform comprises a transverse moving platform and a longitudinal moving platform, the transverse moving platform is arranged above the longitudinal moving platform, and the transverse moving platform and the longitudinal moving platform are both screw rod sliding nut mechanisms.
6. The apparatus for producing an intermetallic compound coating layer according to claim 1, characterized in that: and a thermocouple is arranged in the cavity of the heating furnace body and is electrically connected with the temperature control device.
7. The apparatus for producing an intermetallic compound coating layer according to claim 1, characterized in that: the spraying equipment comprises a spraying gun, a powder feeder and a protective gas cylinder, wherein the spraying gun is respectively communicated with the powder feeder and the protective gas cylinder through pipelines, the protective gas in the protective gas cylinder is argon, and the same or different spraying powders are arranged in the two powder feeders.
8. The apparatus for producing an intermetallic compound coating layer according to claim 7, characterized in that: the spraying equipment is one of plasma spraying equipment, electric arc spraying equipment, supersonic speed flame spraying equipment and oxyacetylene flame spraying equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221892234.8U CN217948236U (en) | 2022-07-20 | 2022-07-20 | Device for preparing intermetallic compound coating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221892234.8U CN217948236U (en) | 2022-07-20 | 2022-07-20 | Device for preparing intermetallic compound coating |
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| Publication Number | Publication Date |
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| CN217948236U true CN217948236U (en) | 2022-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221892234.8U Active CN217948236U (en) | 2022-07-20 | 2022-07-20 | Device for preparing intermetallic compound coating |
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- 2022-07-20 CN CN202221892234.8U patent/CN217948236U/en active Active
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