CN115141998B - Amorphous alloy coating and preparation method thereof - Google Patents
Amorphous alloy coating and preparation method thereof Download PDFInfo
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- CN115141998B CN115141998B CN202111048512.1A CN202111048512A CN115141998B CN 115141998 B CN115141998 B CN 115141998B CN 202111048512 A CN202111048512 A CN 202111048512A CN 115141998 B CN115141998 B CN 115141998B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
- A47J36/025—Vessels with non-stick features, e.g. coatings
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/02—Amorphous alloys with iron as the major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/10—Amorphous alloys with molybdenum, tungsten, niobium, tantalum, titanium, or zirconium or Hf as the major constituent
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/131—Wire arc spraying
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Food Science & Technology (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The inventive concept provides a method of preparing an amorphous alloy coating and a cooker including the amorphous alloy coating obtained by the method. The method comprises the following steps: providing a substrate; preparing amorphous alloy powder; the amorphous alloy powder is sprayed on the surface of a substrate by a thermal spraying method, so that an amorphous alloy coating is formed on the surface of the substrate. According to the concept of the invention, the amorphous alloy coating is formed on the inner wall of the cooker by utilizing a thermal spraying process, so that the inner surface of the non-sticking cooker has the advantages of low surface energy, high wear resistance, high temperature stability, high temperature resistance, wear resistance and the like, and the non-sticking effect is realized.
Description
Technical Field
The present inventive concept relates to a coating layer, and more particularly, to a method of providing a non-stick coating layer on an inner wall of a cooker and an amorphous alloy coating layer formed on the inner wall of the cooker by the method.
Background
The implementation of the non-stick technology mainly has three directions: 1) Self low surface energy; 2) Forming a hydrophobic and oleophobic surface similar to the lotus leaf surface through a micro concave-convex structure; 3) The porous reservoir forms a stable oil film to achieve non-stick properties using the oil as an intermediary.
The non-stick materials for the cooker at present mainly comprise fluorine paint, ceramic paint and organic silicon resin, and the three non-stick materials mainly form a non-stick coating on the inner surface of the cooker in a spraying mode so as to achieve the purpose of non-stick when food is heated. The fluorine paint mainly comprises PTFE (polytetrafluoroethylene), PFOA (ammonium perfluorooctanoate), PFA (copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene), FEP (perfluoroethylene propylene copolymer), ETFE (ethylene-tetrafluoroethylene copolymer) and the like, and the non-sticking principle is mainly that the fluorine-containing polymer has extremely low surface free energy. The ceramic coating is mainly coating with inorganic silicon with a silicon-oxygen bond structure as a main component, and the ceramic coating achieves the non-sticky effect mainly by forming a nano structure on the surface of the cooker. The organic silicon resin achieves the effect of non-sticking by mainly utilizing the characteristic of low surface energy. Although the three coatings have non-sticking effects, the three coatings have obvious defects: the fluorine coating is not sticky and wear-resistant, so that a shovel cannot be used in cooking, a steel wire ball and a scouring pad cannot be used for cleaning, harmful substances can be generated by decomposition at high temperature, and the non-tackiness is reduced after abrasion; the ceramic coating has a lower non-stick effect than the fluorine coating, and is non-stick mainly by using silicone oil in a coating system, but has poor lasting non-stick property, and the coating can easily fall off after being used for 3-6 months generally; the non-sticking effect of the organosilicon coating is also poorer than that of the fluorine coating, the color of the organosilicon coating is easy to yellow or ash after the organosilicon coating contacts high temperature or open fire, the hardness of the organosilicon coating is reduced at high temperature, and the phenomenon of 'back sticking' is easy to occur.
It can be seen that the non-stick material is not sticky enough for a long time.
Disclosure of Invention
An aspect of the inventive concept provides a method of preparing an amorphous alloy coating, by which an amorphous alloy coating having low surface energy, high wear resistance, and high temperature stability can be prepared.
Another aspect of the inventive concept provides a cooker including an amorphous alloy coating layer, which has high temperature resistance, abrasion resistance, etc. characteristics while being non-sticky, thereby achieving a durable non-sticky effect
According to an exemplary embodiment of the inventive concept, a method of preparing an amorphous alloy coating includes: providing a substrate; preparing amorphous alloy powder; the amorphous alloy powder is sprayed on the surface of a substrate by a thermal spraying method, so that an amorphous alloy coating is formed on the surface of the substrate.
The thermal spray method may include a low pressure plasma method and/or a sonic flame spray method.
The thickness of the amorphous alloy coating layer may be controlled to be 100 μm to 500 μm.
The porosity of the amorphous alloy coating can be controlled to be 2% -10%.
The atomic percentage of amorphous phase in the amorphous alloy coating can be controlled to be 60% -100%.
The method may further comprise the step of sanding the amorphous alloy coating.
The surface roughness of the amorphous alloy coating may be controlled to 2 μm to 8 μm.
The amorphous alloy coating may include two or more layers.
The amorphous alloy powder may include at least any one of Fe-based amorphous alloy, zr-based amorphous alloy, cu-based amorphous alloy, al-based amorphous alloy, mg-based amorphous alloy, ti-based amorphous alloy, and high entropy alloy.
The method may further include a step of preheating the substrate before performing the thermal spraying process, and the preheating temperature is controlled to be 200-300 ℃.
According to an exemplary embodiment of the inventive concept, a non-stick cookware includes the above-described amorphous alloy coating as an inner wall coating of the cookware.
According to the above description, the amorphous alloy coating is formed on the inner wall of the cooker by using the thermal spraying process, so that the formed coating has the advantages of low surface energy, high wear resistance, high-temperature stability and the like, and has the characteristics of high temperature resistance, wear resistance and the like while being non-sticky, so as to achieve the effect of lasting non-stick.
Detailed Description
The inventive concept will now be described more fully hereinafter. The inventive concept may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Amorphous alloys refer to alloys in which the three-dimensional space of atoms in a solid state is topologically disordered and remains relatively stable over a range of temperatures. The amorphous alloy has the characteristics of long-range disordered short-range ordered, and molecules (or atoms and ions) of substances composing the amorphous alloy do not have space regular periodicity, and crystal grains and crystal boundaries of the crystalline alloy are not present, so the amorphous alloy has lower surface energy compared with common materials, and the amorphous alloy has a non-sticky effect. Meanwhile, the amorphous alloy has no structural defects such as grain boundaries, twin crystals, lattice defects, dislocation, stacking faults and the like as a crystal alloy, has no heterogeneous phase, precipitation, segregation and other component fluctuation, is a disordered structure, has high uniformity in chemistry, has no plastic deformation forms such as grain boundary sliding and the like when being subjected to external force, and has higher strength. Accordingly, the present inventive concept achieves the characteristics of high non-tackiness and long service life of the cooker by forming an amorphous alloy coating on the inner wall of the cooker using a thermal spray process.
The coating layer having high strength, long service life and excellent non-tackiness, which is formed by the thermal spray process, of the inventive concept will now be described in detail hereinafter.
The method of preparing an amorphous alloy coating applicable to a cooker surface according to the inventive concept may include a step of providing a substrate, a step of preparing amorphous alloy powder, and a step of spraying the amorphous alloy powder on a substrate surface using a thermal spraying method to form an amorphous alloy coating on the substrate surface.
Herein, some steps are described sequentially, however, these sequences do not necessarily limit the present invention. That is, the two sequentially described sequences may be simultaneously performed or performed in reverse order of the described sequences, to which the present invention is not limited. For example, the step of providing the substrate and the step of preparing the alloy powder may be performed simultaneously, or the step of preparing the alloy powder may be performed first and then the step of providing the substrate may be performed. That is, the process sequence may be arbitrarily selected by those skilled in the art as desired.
According to the method for preparing amorphous alloy coating by using thermal spraying process, it is preferred to provide a substrate and prepare alloy powder.
According to the inventive concept, the substrate may be a base of a cooker (e.g., a pot), so that an accommodation space may be provided for an operation such as cooking. Accordingly, the base material can be manufactured into various shapes using a metal material. For example, according to an exemplary embodiment, the substrate may include stainless steel, cast iron, aluminum alloy, titanium alloy, copper alloy, magnesium alloy, or a composite material composed of two or more thereof, and may have a single-layer or multi-layer structure, to which the inventive concept is not limited. In addition, the substrate may be formed to have an angled shape and/or a rounded shape depending on the process, aesthetic appearance, and specific needs.
After the substrate is provided, the substrate may be subjected to a pretreatment. Here, the pretreatment may include a treatment of degreasing, sanding, alcohol wiping, or the like of the surface of the substrate on which the amorphous alloy coating layer is to be formed, to provide excellent surface properties, thereby facilitating the formation and adhesion of the amorphous alloy coating layer. However, the inventive concept is not limited thereto, that is, the pretreatment step of the substrate may be omitted.
The amorphous alloy powder may be prepared simultaneously with or after the preparation of the substrate.
Here, the amorphous alloy material may include an amorphous alloy commonly used in the art and may further include a high-entropy alloy, and may be attached on at least part of the surface of the core material in various forms (e.g., a layer, a film, a block, particles having a specific shape or an amorphous shape). The amorphous alloy main element component may include Fe, zr, cu, al, mg, ti, sn, ni, pb, zn, nd, ga, mo, hf, cr, ca, Y, si, P, B, C and the like, but is not limited thereto. The amorphous alloy according to the inventive concept may be one or more selected from the group consisting of iron (Fe) -based amorphous alloy, zirconium (Zr) -based amorphous alloy, copper (Cu) -based amorphous alloy, aluminum (Al) -based amorphous alloy, magnesium (Mg) -based amorphous alloy, titanium (Ti) -based amorphous alloy. For example, the number of the cells to be processed, the amorphous alloy has the components expressed in atomic percent of Zr60-Cr20-Al13-Ni5-Hf2, zr65- (Ti) -Ni10-Al 10-C.mu.15, fe80-Cr5-Mo6-B4-Si5, fe50-Zr20-Cr 9-B6-C.mu.10-Y5, fe87.4-Si6.7-B2.4-Cr2.7-C0.8, and the like.
For example, the amorphous alloy may include a Fe-based amorphous alloy (including Fe-Cr-C, fe-B-Si, fe-Si-B-Cr-C, fe-Mo-C, fe-Cr-P, fe-Mo-P, or Fe-Cr-Mo-C-P), wherein the Cr content may be controlled to 0wt% to 25wt%, the Mo content may be controlled to 0wt% to 15wt%, the C content may be controlled to 0wt% to 5wt%, the P content may be controlled to 0wt% to 8wt%, the B content may be controlled to 2% to 5%, and the Si content may be controlled to 5% to 8%. The amorphous alloy powder with the composition ratio has the beneficial effects of strong amorphization capability, high amorphization degree of the sprayed coating, lower surface energy, high hardness, good wear resistance and the like.
For another example, the amorphous alloy may include Zr-based amorphous alloy powder Zr65- (Ti) -Ni10-Al10-Cu15, zr-Cu-Ti, zr-Al-Ni-Pt, zr53-Cu30-Al10-Ni5-Hf2, and the like.
In addition, the high-entropy alloy described herein refers to an alloy that contains five or more alloying elements and that has equal or substantially equal atomic percentages of the various alloying components, as known in the art. For example, the high entropy alloy may be Fe20-Sn20-Pb20-P20-C20, etc. Accordingly, the inventive concept is not described in detail for high entropy alloys, and the inventive concept is not limited thereto.
Hereinafter, the amorphous alloy and the high-entropy alloy are collectively referred to as an amorphous alloy material. However, it will be understood that when referring to amorphous alloy materials, amorphous alloy powders, and/or amorphous alloy coatings, high entropy alloys may be included therein, or only amorphous alloys may be included without high entropy alloys. For example, when amorphous alloy material, amorphous alloy powder and/or amorphous alloy coating are mentioned, they may be composed of only amorphous alloy or of amorphous alloy and high entropy alloy.
According to the inventive concept, the above-described amorphous alloy powder may be prepared using an atomization method. Specifically, a molten alloy liquid (e.g., an Fe-based molten alloy liquid) for forming an amorphous alloy powder may be directed onto a copper quenching disc rotating at a high speed (a surface linear velocity may reach 100 m/s), and fine particles solidified after atomization of the molten alloy liquid may be scattered around by centrifugal force, at which time inert gas may be blown through gas nozzles provided around the disc to accelerate cooling of the fine particles. The cooling rate of the method can reach 106K/s, so that the alloy structure is not crystallized and is solidified in a supercooled state, thereby forming amorphous alloy powder. The amorphous alloy powder produced by this method may have a particle size ranging from 10 μm to 100 μm. Then, alternatively, amorphous alloy powder in the range of 10 μm to 50 μm may be obtained as amorphous alloy powder for thermal spraying process of the present inventive concept by sieving with a particle size screener such as a sieve.
After the substrate and the amorphous alloy powder are prepared, a thermal spray process may be performed to spray the amorphous alloy powder on the surface of the substrate.
The thermal spraying process according to the inventive concept may include a low pressure plasma process and/or a supersonic flame spraying process, and after the thermal spraying process, an amorphous alloy coating layer may be prepared on the surface of the substrate. Here, the thickness of the amorphous alloy coating prepared by the thermal spraying process may be controlled to be 100 μm to 500 μm: if the thickness of the formed amorphous alloy coating is so thin as to be less than 100 μm (in this case, only 2 to 3 powder deposition layers are provided without the tamping action of the subsequently sprayed particles, the deposited particles are less deformed under stress, the coating density is poor), the coating is loose and porous and has poor strength, resulting in insufficient wear resistance of the amorphous alloy coating; however, if the thickness of the formed amorphous alloy coating is too thick to be more than 500 μm, heat concentration of the coating at the time of spraying is easily caused, so that a part of the texture is transformed into crystallization, resulting in a decrease in the proportion of amorphous phase, and thus a decrease in the non-tackiness of the coating.
In addition, the amorphous phase ratio in the amorphous alloy coating layer prepared by the thermal spraying process according to the inventive concept can be controlled to be 60vol% (volume percent) to 100vol%, because the non-tackiness is lowered if the amorphous ratio is too low to be lower than 60 vol%; in addition, the porosity in the amorphous alloy coating layer can be controlled in the range of 2vol% to 10vol%, because if the porosity is too high, the coating strength is lowered, thereby affecting the wear resistance.
After the amorphous alloy coating is prepared by using a thermal spraying process, the amorphous alloy coating can be sanded, such as by using an industrial scouring pad, to control the surface roughness Ra of the amorphous alloy coating to 3 μm to 10 μm. By controlling the surface roughness of the amorphous alloy coating in the above range, the rough surface of the amorphous alloy coating can have a certain oil absorption and storage effect in combination with pores, so that the non-sticking effect of the amorphous alloy coating can be enhanced. However, the inventive concept is not limited thereto, and the sanding step may be omitted.
Above, the method of preparing an amorphous alloy coating according to the inventive concept is described in detail. Compared with the metal powder spraying process in the prior art, the method for preparing the amorphous alloy coating has the advantages of longer spraying distance, lower spraying temperature, more sufficient powder heat absorption and heat dissipation and the like, thereby ensuring that the temperature of the amorphous powder is in a supercooled liquid phase region and does not exceed the crystallization transition temperature of the amorphous powder, and the amorphous powder is softened in the supercooled liquid phase region temperature range and is easier to deform.
Hereinafter, a method of preparing an amorphous alloy coating according to the inventive concept will be described in detail with a low-pressure plasma arc process as a specific example of a thermal spray process.
The amorphous alloy coating is formed by using a low-pressure plasma arc process, which comprises the following specific steps:
1) Providing a substrate and pre-treating the surface of the substrate. The pretreatment comprises cleaning the greasy dirt on the surface by adopting an alkaline solvent, then cleaning the greasy dirt, drying, and then performing sand blasting coarsening to increase the surface roughness of the substrate so as to improve the binding force of the subsequent spray coating;
2) And (5) preheating the base material. The heating furnace is adopted to preheat the base material, and the preheating temperature can be between 200 and 300 ℃. The preheating can reduce the temperature difference between the substrate and the high-temperature powder, reduce the thermal stress between the substrate and the coating, and improve the quality and the bonding strength of the coating;
3) And (5) plasma arcing, and performing thermal spraying of the amorphous alloy coating. Specifically, in the thermal spray process: firstly, pumping the vacuum degree of a spraying chamber to 0.1 Pa-1.3 Pa, and then flushing argon to 5 multiplied by 10 3 Pa, the transfer arc power is controlled at 30Kw, the arc current is controlled at 600A-800A, the spraying distance is controlled at 150-200 mm, and the spraying angle is controlled at 60-80 degrees. The powder feeding speed is controlled to be 30 g/min-50 g/min, the hydrogen pressure is controlled to be 0.3 MPa-0.7 MPa, and the hydrogen flow is controlled to be 5L/min-10L/min. Adopting a multi-spraying method, wherein the thickness of each spraying is 50 mu m, so as to prevent the amorphous alloy coating from overheating;
4) After the spraying is finished, naturally cooling the amorphous alloy coating, and sanding the surface by adopting 120-mesh sand paper, wherein the surface roughness Ra of the amorphous alloy coating after sanding reaches 2-8 mu m.
In the following, non-stick coatings according to the inventive concept are prepared on the surface of cookware using the plasma spray process specifically described above, taking Fe-Cr-C, fe-Mo-C, fe-Cr-P, fe-Mo-P and Fe-Cr-Mo-C-P amorphous alloy powders as specific examples. In the specific example above, the preheating temperature was controlled at 250 ℃, the vacuum degree of the spray chamber was evacuated to 0.8Pa, the arc current was controlled at 700A, the spray distance was controlled at 170mm, the spray angle was controlled at 70 °, the powder feeding speed was controlled at 40g/min, the hydrogen pressure was controlled at 0.5MPa, the hydrogen flow rate was controlled at 5L/min, and the surface roughness Ra of the amorphous alloy coating after sanding was controlled at 0.5. Mu.m.
And, the non-sticking effect of the amorphous alloy coating obtained by the above specific example and the coating of the conventional fluorine coating and ceramic coating was tested by using acceleration simulation, and the specific test method thereof is as follows.
The non-stick life of the amorphous alloy coating according to the inventive concept and the prior art coating was evaluated with reference to a non-stick pan acceleration simulation test procedure, which is as follows:
a: vibration wear resistance test→b: dry-burning mixed sauce material- & gtC: boiling brine- & gtD: stir-frying quartz stone (iron shovel) → E: the omelet was evaluated for non-stick grade, and the above 4 test steps were completed and the non-stick grade was evaluated once, marking the end of one cycle.
When the acceleration simulation test is performed, the non-sticking life is determined after each cycle is completed. Endpoint determination occurs as one of the following:
(1) Tack-free decrease:
the non-sticking grade of the fried eggs is III grade continuously in two cycles;
(2) Appearance failure:
the coating layer has fuzzing phenomenon;
the coating falling area diameter is more than 3mm 2 ；
Abrasion significantly exposes the substrate;
the coating has more than 3 penetrating scratches (exposing the substrate);
dirt which cannot be washed off by the wet rag appears;
the number of simulated test cycles at the end point of the test is recorded to be the non-stick life of the product, and the more the number of cycles is, the longer the non-stick life of the coating is.
The experimental results are as follows:
from comparison of the experimental results of examples 1 to 7 and comparative examples 1 to 2, it is clear that: the amorphous alloy coating obtained by the invention has better lasting non-adhesion compared with the existing fluorine coating and ceramic coating, and the non-adhesion life is almost improved by 3 times.
Although one or more embodiments of the present invention have been described, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope as defined by the following claims.
Claims (7)
1. A method of preparing an amorphous alloy coating that does not adhere to cookware, the method comprising:
providing a substrate;
preparing amorphous alloy powder;
spraying the amorphous alloy powder on the surface of a substrate by using a thermal spraying method so as to form an amorphous alloy coating with the porosity of 2-10% and the thickness of 100-500 mu m on the surface of the substrate,
wherein the atomic percentage of amorphous phase in the amorphous alloy coating is controlled to be 60% -100%.
2. The method of claim 1, wherein the thermal spray method comprises a low pressure plasma method and/or a sonic flame spray method.
3. The method of claim 1, further comprising the step of sanding the amorphous alloy coating.
4. A method according to claim 3, wherein the surface roughness of the amorphous alloy coating is controlled to be 2 μm to 8 μm.
5. The method of claim 1, further comprising the step of preheating the substrate prior to performing the thermal spray process.
6. The method of claim 1, wherein the amorphous alloy powder comprises at least any one of a Fe-based amorphous alloy, a Zr-based amorphous alloy, a Cu-based amorphous alloy, an Al-based amorphous alloy, a Mg-based amorphous alloy, a Ti-based amorphous alloy, and a high entropy alloy.
7. A non-stick cookware, characterized in that it comprises an amorphous alloy coating prepared according to any of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111048512.1A CN115141998B (en) | 2021-09-08 | 2021-09-08 | Amorphous alloy coating and preparation method thereof |
Applications Claiming Priority (1)
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