CN115141998A - Amorphous alloy coating and preparation method thereof - Google Patents
Amorphous alloy coating and preparation method thereof Download PDFInfo
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- CN115141998A CN115141998A CN202111048512.1A CN202111048512A CN115141998A CN 115141998 A CN115141998 A CN 115141998A CN 202111048512 A CN202111048512 A CN 202111048512A CN 115141998 A CN115141998 A CN 115141998A
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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
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; and spraying the amorphous alloy powder on the surface of the substrate by using a thermal spraying method so as to form an amorphous alloy coating on the surface of the substrate. According to the conception of the invention, the amorphous alloy coating is formed on the inner wall of the cooker by utilizing the thermal spraying process, so that the inner surface of the non-stick cooker has low surface energy, high wear resistance and high temperature stability, and has the advantages of high temperature resistance, wear resistance and the like while being non-stick, thereby realizing the effect of lasting non-stick.
Description
Technical Field
The present inventive concept relates to a coating, and more particularly, to a method of providing a non-stick coating on an inner wall of a cooker and an amorphous alloy coating formed on the inner wall of the cooker by the method.
Background
The realization of the non-stick technology has three main directions: 1) Low surface energy of itself; 2) Forming a hydrophobic and oleophobic surface similar to a lotus leaf surface through a microscopic concave-convex structure; 3) The porous oil storage forms a stable oil film so as to realize non-sticking by using oil as a medium.
The non-stick materials for the current cookers mainly comprise fluorine paint, ceramic paint and organic silicon resin, and the three non-stick materials form a non-stick coating on the inner surface of the cooker mainly in a spraying mode so as to achieve the aim of non-stick when heating food. The fluorine paint mainly comprises PTFE (polytetrafluoroethylene), PFOA (perfluorooctanoic acid ammonium), PFA (copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene), FEP (fluorinated ethylene propylene copolymer), ETFE (ethylene-tetrafluoroethylene copolymer) and the like, and the non-stick principle of the fluorine paint is that the fluorine-containing polymer has extremely low surface free energy. The ceramic coating is mainly a coating which takes inorganic silicon with a silicon-oxygen bond structure as a main component, and the non-stick effect is achieved mainly by forming a nano structure on the surface of a cooker. The silicone resin achieves the effect of non-stick mainly by utilizing the characteristic of low surface energy. Although these three coatings have a non-stick effect, they all have significant drawbacks: the fluorine coating non-stick coating is not wear-resistant, so that an iron shovel cannot be used during cooking, a steel wire ball and scouring pad cannot be used for cleaning, harmful substances can be generated by decomposition at high temperature, and the non-stick property is reduced after the coating is worn; the ceramic coating has a poor non-stick effect compared with a fluorine coating, is non-stick by mainly utilizing silicone oil in a coating system, but has poor lasting non-stick property, and the coating can easily fall off after being generally used for 3-6 months; the non-stick effect of the organic silicon coating is poorer than that of the fluorine coating, the color of the organic silicon coating is easy to yellow or gray after the organic silicon coating is contacted with high temperature or open fire, the hardness is reduced at high temperature, and the phenomenon of 'back sticking' is easy to generate.
Therefore, the non-stick material generally has the phenomenon of poor permanent non-stick property.
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 cookware including an amorphous alloy coating that is resistant to high temperatures, abrasion, and the like, while not being tacky, thereby achieving a durable non-stick 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; and spraying the amorphous alloy powder on the surface of the substrate by using a thermal spraying method so as to form an amorphous alloy coating on the surface of the substrate.
The thermal spray process may include a low pressure plasma process and/or a sonic flame spray process.
The thickness of the amorphous alloy coating can be controlled between 100 mu m and 500 mu m.
The porosity of the amorphous alloy coating can be controlled to be 2-10%.
The atom percentage of the 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 can be controlled to be 2-8 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 the 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 amorphous alloy coating described above as an inner wall coating for cookware.
According to the above description, the amorphous alloy coating formed on the inner wall of the cooker by the thermal spraying process provided by the invention has the advantages of low surface energy, high wear resistance, high temperature stability and the like, so that the amorphous alloy coating has the characteristics of high temperature resistance, wear resistance and the like while realizing non-adhesion, and achieves the effect of lasting non-adhesion.
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.
An amorphous alloy is an alloy in which atoms are topologically randomly arranged in a three-dimensional space in a solid state and which maintains a relatively stable state over a certain temperature range. The amorphous alloy has the characteristic of long-range disorder short-range order, and molecules (or atoms and ions) of substances composing the amorphous alloy do not have spatial regular periodicity, and crystal grains and crystal boundaries of the crystalline alloy do not exist, so that the amorphous alloy has lower surface energy compared with common materials to generate 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 in the crystalline alloy, has no heterogeneous phase, precipitate, segregation and fluctuation of other components, is a disordered structure, has high uniformity chemically, has no plastic deformation modes such as grain boundary slippage and the like when being subjected to external force, and has higher strength. Accordingly, the present invention contemplates to realize the characteristics of high non-adhesiveness and long service life of the cooker by forming the amorphous alloy coating layer on the inner wall of the cooker using the thermal spraying process.
The coating layer formed by the thermal spraying process of the present inventive concept having high strength, high lifespan and excellent non-stick properties will now be described in detail hereinafter.
The method of preparing an amorphous alloy coating applicable to a surface of a cooker according to the inventive concept may include a step of providing a base material, a step of preparing an amorphous alloy powder, and a step of spraying the amorphous alloy powder on a surface of the base material using a thermal spraying method to form an amorphous alloy coating on the surface of the base material.
Herein, some steps are described sequentially, however, these sequences do not necessarily limit the present invention. That is, the order described for two orders may be performed simultaneously or in an order reverse to the order described, and the present invention is not limited thereto. For example, the step of providing the base material 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 base material may be performed. That is, the process order can be arbitrarily selected by those skilled in the art as needed.
According to the method for preparing the amorphous alloy coating by using the thermal spraying process, which is contemplated by the invention, a substrate is firstly required to be provided and alloy powder is prepared.
According to the inventive concept, the base material may be a base of a cooker (e.g., a pot), so that a receiving space may be provided for an operation such as cooking. Therefore, the base material can be manufactured in various shapes using a metal material. For example, according to example embodiments, the base material may include stainless steel, cast iron, an aluminum alloy, a titanium alloy, a copper alloy, a magnesium alloy, or a composite material composed of two or more of them, 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 according to the process, aesthetic appearance, specific needs.
After providing the substrate, the substrate may be pretreated. Here, the pre-treatment may include a treatment of degreasing, sanding, alcohol wiping, etc., on the surface of the substrate on which the amorphous alloy coating is to be formed, to provide excellent surface properties, thereby facilitating the formation and adhesion of the amorphous alloy coating. 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 substrate is prepared.
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 a 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 main element components of the amorphous alloy may include Fe, zr, cu, al, mg, ti, sn, ni, pb, zn, nd, ga, mo, hf, cr, ca, Y, si, P, B, C, etc., but are not limited thereto. The amorphous alloy according to the inventive concept may be one or more selected from iron (Fe) -based amorphous alloys, zirconium (Zr) -based amorphous alloys, copper (Cu) -based amorphous alloys, aluminum (Al) -based amorphous alloys, magnesium (Mg) -based amorphous alloys, titanium (Ti) -based amorphous alloys. For example, in the case of a liquid, the amorphous alloy may have the composition expressed in atomic percent of Zr60-Cr20-Al13-Ni5-Hf2, zr65- (Ti) -Ni10-Al 10-Cmu 15 Fe80-Cr5-Mo6-B4-Si5, fe50-Zr20-Cr9-B6-C mu 10-Y5, fe87.4-Si6.7-B2.4-Cr2.7-C0.8, etc.
For example, the amorphous alloy may include Fe-based amorphous alloys (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), in which 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 wt% to 5wt%, and the Si content may be controlled to 5wt% to 8%. The amorphous alloy powder with the component proportion has the advantages of strong non-crystallizing capability, high non-crystallizing degree of a sprayed coating, low surface energy, high hardness, good wear resistance and the like.
As another example, the amorphous alloy may include Zr-based amorphous alloy powders 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 alloys described herein refer to alloys known in the art that contain five or more alloying elements and the atomic percentages of the various alloying elements are equal or substantially equal. For example, the high entropy alloy may be Fe20-Sn20-Pb20-P20-C20, etc. Accordingly, the inventive concept is not described in detail as high entropy alloys and 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 reference is made to amorphous alloy materials, amorphous alloy powders and/or amorphous alloy coatings, high entropy alloys may be included therein, or only amorphous alloys and not high entropy alloys. For example, when referring to amorphous alloy materials, amorphous alloy powders, and/or amorphous alloy coatings, the alloy material can be composed of amorphous alloy only or the 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 amorphous alloy powder may be projected onto a copper chill plate rotating at a high speed (surface linear velocity of 100 m/s), and fine particles solidified after the molten alloy liquid is atomized are dispersed all around by centrifugal force, and at this time, inert gas is blown through gas nozzles provided on the periphery of the plate to accelerate cooling of the fine particles. The cooling rate of the method can reach 106K/s, so that the alloy structure is not as time to crystallize but is solidified in a supercooled state, thereby forming amorphous alloy powder. The grain size of the amorphous alloy powder prepared by the method can be in the range of 10-100 μm. Then, alternatively, the amorphous alloy powder in the range of 10 μm to 50 μm may be obtained by sieving with a particle size screener such as a sieve as the amorphous alloy powder for the thermal spraying process contemplated by the present invention.
After the substrate and the amorphous alloy powder are prepared, a thermal spraying process may be performed to spray the amorphous alloy powder on the surface of the substrate.
The thermal spraying process according to the present 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 may be prepared on the surface of the substrate. Here, the thickness of the amorphous alloy coating prepared by the thermal spraying process can be controlled to be between 100 and 500 μm: if the thickness of the formed amorphous alloy coating is too thin to be less than 100 μm (in this case, only 2 to 3 powder deposition layers have no tamping effect of the subsequently sprayed particles, the deposited particles are deformed less by force, and the coating has poor compactness), the coating is loose and porous and has poor strength, thereby causing insufficient wear resistance of the amorphous alloy coating; however, if the thickness of the amorphous alloy coating layer formed is too thick to be greater than 500 μm, it is liable to cause concentration of heat of the coating layer at the time of spraying, so that a crystallization transformation is generated in a portion of the texture, resulting in a decrease in amorphous phase ratio, thereby causing a decrease in non-adhesiveness of the coating layer.
In addition, the amorphous phase content ratio in the amorphous alloy coating layer prepared by the thermal spraying process according to the present inventive concept can be controlled from 60vol% (volume percent) to 100vol%, because if the amorphous ratio is too low to be lower than 60vol%, the non-adhesiveness is decreased; in addition, the porosity in the amorphous alloy coating can be controlled in the range of 2vol% to 10vol%, because if the porosity is too high, the coating strength is decreased, thereby affecting the wear resistance.
After the amorphous alloy coating is prepared by the thermal spraying process, the amorphous alloy coating can be sanded by using industrial scouring pad, so that the surface roughness Ra of the amorphous alloy coating is controlled to be 3-10 μm. By controlling the surface roughness of the amorphous alloy coating within the range, the rough surface of the amorphous alloy coating can be combined with pores to have certain oil absorption and storage effects, so that the non-stick effect of the amorphous alloy coating can be enhanced. However, the inventive concept is not limited thereto, and the sanding step may be omitted.
In the above, the method of preparing the 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, so that the temperature of the amorphous powder is ensured to be in a supercooled liquid phase region and not exceed the crystallization transition temperature of the amorphous powder, and the amorphous powder is softened in the temperature range of the supercooled liquid phase region and is easier to deform.
In the following, 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 the thermal spraying process.
The method for forming the amorphous alloy coating by using the low-pressure plasma arc process comprises the following specific steps of:
1) Providing a substrate and pretreating the surface of the substrate. The pretreatment comprises the steps of cleaning oil stain on the surface by using an alkaline solvent, then performing water cleaning and drying, and then performing sand blasting and coarsening to increase the surface roughness of a matrix so as to improve the binding force of a subsequent spraying layer;
2) And preheating the base material. The base material is preheated by a heating furnace, and the preheating temperature can be 200-300 ℃. Preheating can reduce the temperature difference between the matrix and the high-temperature powder, reduce the thermal stress between the matrix and the coating, and improve the quality and the bonding strength of the coating;
3) And (4) plasma arc starting, and performing thermal spraying of the amorphous alloy coating. Specifically, in a thermal spray process: firstly, the vacuum degree of a spraying chamber is pumped to 0.1Pa to 1.3Pa, and then argon is filled to 5 multiplied by 10 3 Pa, the power of the transferred arc is controlled at 30Kw, the current of the arc is controlled at 600A-800A, the spraying distance is controlled at 150 mm-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 multiple spraying method, wherein the thickness of each spraying is 50 mu m, so as to prevent the amorphous alloy coating from overheating;
4) And after the spraying is finished, naturally cooling the amorphous alloy coating, and sanding the surface by using 120-mesh sand paper, wherein the surface roughness Ra of the sanded amorphous alloy coating reaches 2-8 mu m.
In the following, 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, the plasma spraying process described above in detail is used to prepare the non-stick coating on the surface of the cookware according to the concept of the present invention. In the above specific example, the preheating temperature is controlled at 250 ℃, the vacuum degree of the spraying chamber is pumped to 0.8Pa, the arc current is controlled at 700A, the spraying distance is controlled at 170mm, the spraying angle is controlled at 70 degrees, the powder feeding speed is controlled at 40g/min, the hydrogen pressure is controlled at 0.5MPa, the hydrogen flow is controlled at 5L/min, and the surface roughness Ra of the amorphous alloy coating after sanding is controlled at 0.5 μm.
Further, the non-stick effect of the amorphous alloy coating obtained by the above specific example and the coating of the comparative example, which is the conventional fluorine paint and ceramic paint, was tested by accelerated simulation, and the specific test method thereof is as follows.
The nonstick life of the amorphous alloy coating according to the concept of the invention and the coating in the prior art is evaluated by referring to an accelerated simulation test program of a nonstick frying pan, and the test flow is as follows:
a: shock abrasion resistance test → B: dry-cooked mixed sauce → C: boiled salt water → D: quartz stone (shovel) → E: and (4) evaluating the non-stick grade of the fried eggs, finishing the 4 testing steps and one non-stick grade evaluation, and marking the end of one cycle.
And when the accelerated simulation test is carried out, judging the non-stick service life after each cycle is finished. The endpoint can be determined when one of the following phenomena occurs:
(1) The non-stick property is reduced:
the non-stick level of the fried eggs is continuously classified as level III;
(2) Appearance failure:
the coating has a fluffing phenomenon;
the diameter of the coating falling area is more than 3mm 2 ；
The abrasion obviously exposes the base material;
the coating has puncture type scratches (exposing the base material) of more than 3;
the dirt which cannot be washed off by the wet rag is generated;
the number of simulated test cycles at the end of the test was recorded as the non-stick life of the product, with more cycles indicating a longer non-stick life of the coating.
The experimental results are as follows:
from the comparison of the experimental results of examples 1 to 7 and comparative examples 1 to 2, it can be seen that: compared with the coating of the existing fluorine coating and ceramic coating, the amorphous alloy coating obtained by the conception of the invention has better durability and non-stick property, and the non-stick service life is almost improved by 3 times.
While 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 of the present invention as defined by the following claims.
Claims (10)
1. A method of making an amorphous alloy coating, the method comprising:
providing a substrate;
preparing amorphous alloy powder;
and spraying the amorphous alloy powder on the surface of the substrate by using a thermal spraying method so as to form an amorphous alloy coating on the surface of the substrate.
2. The method of claim 1, wherein the thermal spray process comprises a low pressure plasma process and/or a sonic flame spray process.
3. The method according to claim 1, wherein the thickness of the amorphous alloy coating is controlled to be 100 μm to 500 μm.
4. The method of claim 1, wherein the amorphous alloy coating is controlled to have a porosity of 2% to 10%.
5. The method of claim 1, wherein the amorphous alloy coating is controlled to have an amorphous phase at 60 atomic% to 100 atomic%.
6. The method of claim 1, further comprising the step of sanding the amorphous alloy coating.
7. The method according to claim 6, wherein the surface roughness of the amorphous alloy coating is controlled to be 2 μm to 8 μm.
8. The method of claim 1, further comprising the step of preheating the substrate prior to performing the thermal spray process.
9. The method according to claim 1, wherein the amorphous alloy powder comprises at least any one of an Fe-based amorphous alloy, a Zr-based amorphous alloy, a Cu-based amorphous alloy, an Al-based amorphous alloy, an Mg-based amorphous alloy, a Ti-based amorphous alloy, and a high-entropy alloy.
10. Non-stick cookware, characterized in that it comprises a coating of amorphous alloy prepared according to any one of claims 1 to 9.
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)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111048512.1A CN115141998B (en) | 2021-09-08 | 2021-09-08 | Amorphous alloy coating and preparation method thereof |
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