CN116411235B - Method for preparing in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating by plasma spraying - Google Patents
Method for preparing in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating by plasma spraying Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000007750 plasma spraying Methods 0.000 title claims abstract description 29
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 30
- 238000005507 spraying Methods 0.000 claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 21
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000007921 spray Substances 0.000 claims abstract description 10
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Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
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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
-
- 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
- C23C4/18—After-treatment
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- Thermal Sciences (AREA)
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Abstract
The invention discloses a method for preparing an in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating by plasma spraying, and belongs to the technical field of high-entropy alloy coatings. High-entropy alloy powder Fe by plasma spraying 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 Spraying on a substrate, and carrying out vacuum heat treatment and solution treatment on the obtained coating to obtain an in-situ authigenic nano precipitated phase enhanced high-entropy alloy coating; the parameters in the plasma spraying process are set as follows: the distance between the plasma spray gun and the substrate is 140mm, the spraying voltage is 72.5V, the spraying current is 620A, the powder feeding rate is 35g/min, the argon flow is 30Slpm, and the hydrogen flow is 8Slpm. The method has low cost, further expands the application range of the high-entropy alloy, and has good interlayer combination, compact structure and excellent wear resistance.
Description
Technical Field
The invention belongs to the technical field of high-entropy alloy coatings, and particularly relates to a method for preparing an in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating by plasma spraying.
Background
Experience in the development of conventional alloys has shown that after the number of metal elements constituting the alloy is increased, numerous brittle intermetallic compounds having complicated structures are formed, and the alloy performance is deteriorated. However, in recent years, researchers have found that an alloy obtained by melting 5 or more metal elements in an equimolar ratio or a nearly equimolar ratio, without distinguishing the main elements, has a microstructure that is simplified, is free from intermetallic compounds, has structural features such as nano precipitates and amorphous structures, and has high strength, high hardness, tempering softening resistance, wear resistance, and other performance characteristics. Such alloys were initially defined by She Junwei et al as multi-principal alloys or high entropy alloys. The prior traditional alloy has no alloy with the excellent properties, so the high-entropy alloy has wide application prospect, can be widely applied to manufacturing high-strength, high-temperature-resistant and corrosion-resistant cutters, dies and parts, and is a good opportunity for cutting into the field of high-performance and high-added-value special alloy materials.
Although many students have prepared high-entropy alloy block materials by various methods and have achieved a certain research result, the preparation of block materials has unavoidable defects such as material waste, component segregation, shrinkage cavity and the like. The high-entropy alloy material is used as a coating by a coating technology, so that the manufacturing cost can be greatly reduced and the industrialization of the high-entropy alloy material can be accelerated.
There are some methods for preparing high-entropy alloy coating such as laser cladding, magnetron sputtering, hot press sintering, etc., but these methods have high preparation cost and are difficult to be applied to industry.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for preparing an in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating by plasma spraying. And preparing a wear-resistant coating on the surface of the stainless steel substrate by adopting an atmospheric plasma spraying process, and adjusting spraying parameters to realize the maximum optimization of the microscopic appearance of the coating so as to obtain the spraying parameters with the optimal wear resistance of the coating. The method has low cost, further expands the application range of the high-entropy alloy, and has good interlayer combination, compact structure and excellent wear resistance.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for preparing an in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating by plasma spraying comprises the steps of spraying high-entropy alloy powder on a substrate in a plasma spraying mode, and carrying out vacuum heat treatment and solution treatment on the obtained coating to obtain the in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating;
the high-entropy alloy powder is Fe 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 ；
The parameters in the plasma spraying process are set as follows: the distance between the plasma spray gun and the substrate is 140mm, the spraying voltage is 72.5V, the spraying current is 620A, the powder feeding rate is 35g/min, the argon flow is 30Slpm, and the hydrogen flow is 8Slpm.
The substrate is 304 stainless steel, oil stains are removed from the surface of the substrate before spraying, and then sand blasting texturing is carried out to achieve uniform surface roughness and no reflection; finally, drying at 90 ℃ for 2 hours, and then carrying out plasma spraying.
Further, the particle size of the high-entropy alloy coating powder is 53-150 μm.
Further, the parameters of the vacuum heat treatment are as follows: the temperature is 780+/-50 ℃ and the time is 3-5 hours; the quenching temperature of the solution treatment is 15-25 ℃.
The invention also provides the in-situ authigenic nano precipitated phase enhanced high-entropy alloy coating prepared by the method.
Compared with the prior art, the invention has the following advantages and technical effects:
1) The invention provides a method for using the atmosphereFe preparation by plasma method 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 Feasibility of high-entropy alloy coating; in the invention, the high-entropy alloy coating is prepared by adopting a plasma spraying technology, and H is changed 2 Flow rate is controlled to control flame flow temperature, so that high-entropy alloy powder is fully melted in the deposition process, interface structure among flattened particles is enhanced, porosity of a coating is reduced, generation of cracks is inhibited, and Fe is obtained 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 Optimal spraying parameters of the high-entropy alloy coating method.
2) The invention adopts commercial gas atomization high-entropy alloy powder, has good sphericity, and ensures good fluidity of the powder in the spraying process; as the high-entropy alloy has a diffusion hysteresis effect, a second phase is easy to separate out in a supersaturated solid solution, thereby playing a role in dispersion strengthening.
3) The preparation method disclosed by the invention is simple in preparation process, easy to prepare, low in cost and capable of realizing industrialization. Prepared Fe 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 The high-entropy alloy coating has the characteristics of high hardness, wear resistance and the like, and the hardness and the wear resistance of the coating are greatly improved after the subsequent heat treatment strengthening.
4) The method has small influence on the matrix, and the prepared coating is uniform and has controllable thickness.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application. In the drawings:
FIG. 1 is Fe 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 A morphology of the powder, (a) a morphology of the low-power powder, (b) a morphology of the high-power powder;
FIG. 2 is Fe 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 The surface and cross-sectional morphology of the coating, (a) the surface morphology of the coating, and (b) the cross-sectional morphology of the coating;
FIG. 3 spray-coated Fe prepared according to the present invention 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 Coating and heat-treated Fe 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 An X-ray diffraction pattern of the coating;
FIG. 4 is a Vickers hardness chart of the in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating prepared by the invention before and after heat treatment;
FIG. 5 shows the spray-coated Fe prepared according to the present invention 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 Coating and heat-treated Fe 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 Wear coefficient map of the coating.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The invention discloses a method for preparing an in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating by plasma spraying, which comprises the steps of heating preset alloy powder (high-entropy alloy coating powder) on the surface of 304 stainless steel by adopting plasma thermal spraying under the protection of argon and hydrogen, and carrying out high-temperature spraying (the flame temperature of the plasma spraying is up to thousands of ℃) and quick cooling (the plasma spraying time is very short and only stays on the surface for a few seconds, so that the coating can be subjected to a quick cooling process from thousands of ℃ to room temperature quickly, and the wear-resistant coating can be obtained after solution treatment of the high-entropy alloy coating. The high-entropy alloy coating prepared by the method has good interlayer combination, compact structure and excellent wear resistance. After testing, the coating has good wear resistance and is composed of an FCC phase and an L12 phase and some oxide phases. After heat treatment, the coating is composed of FCC phase, L21 phase and oxide phase, and the wear resistance of the coating is further improved. The abrasion coefficient of the coating provided by the invention at room temperature after test is 0.35. The specific technical scheme is as follows:
a method for preparing an in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating by plasma spraying comprises the steps of spraying high-entropy alloy powder on a substrate in a plasma spraying mode, and carrying out vacuum heat treatment and solution treatment on the obtained coating to obtain the in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating;
the high-entropy alloy powder is Fe 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 ；
The parameters in the plasma spraying process are set as follows: the distance between the plasma spray gun and the substrate is 140mm, the spraying voltage is 72.5V, the spraying current is 620A, the powder feeding rate is 35g/min, the argon flow is 30Slpm, and the hydrogen flow is 8Slpm.
The specific method for preparing the in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating by plasma spraying comprises the following steps:
1) Treating the substrate before spraying;
2) Fixing the substrate on a spraying frame;
3) Placing high-entropy alloy powder for spraying into a powder feeder;
4) Adjusting the spraying distance and determining the running track of the spray gun;
5) Preparing a high-entropy alloy coating by adopting a plasma spraying method;
6) And carrying out vacuum heat treatment and solution treatment on the prepared high-entropy alloy coating to obtain the high-entropy alloy coating.
In some embodiments of the present invention, the substrate is not specifically limited, but preferably, in the present invention, the substrate is 304 stainless steel, and before spraying, the surface of the substrate is degreased, and then is roughened by sand blasting, so as to achieve uniform surface roughness and no reflection; finally, drying at 90 ℃ for 2 hours, and then carrying out plasma spraying.
Preferably, in some embodiments of the present invention, the high entropy alloy coating powder has a particle size of 53-150 μm, since this particle size range can ensure good powder flowability and is easy to melt. Below this range may be detrimental to flowability and may easily cause excessive burning, leaving a large number of holes in the coating and the powder being easily blown off by the plasma flame, making it difficult to deposit on the substrate, resulting in low deposition efficiency. Above this range, the difficulty of melting increases, which results in a larger number of pores of the coating that melt the powder unevenly.
Preferably, in some embodiments of the present invention, the parameters of the vacuum heat treatment are: the temperature is 780+/-50 ℃ and the time is 3-5 hours; the second phase precipitates less in size and less in quantity below this temperature, and the second phase grows more and less in quantity above this temperature.
Preferably, in some embodiments of the invention, the solution treatment is performed at a quenching temperature of 15-25 ℃ for a period of 4 hours. The solid solution at the temperature can fully diffuse the alloy elements in the coating and separate out the nano reinforced phase, thereby improving the hardness of the coating. The number of precipitated phases is small below the temperature, the precipitation strengthening effect is poor, and the size of the precipitated phases grows and the number of the precipitated phases is reduced above the temperature.
The invention also provides the in-situ authigenic nano precipitated phase enhanced high-entropy alloy coating prepared by the method.
The raw materials used in the following examples of the invention are prepared by Ningbo Zhong Yuanzhi materials technology Co., ltd. By adopting an air atomization method.
The following examples serve as further illustrations of the technical solutions of the invention.
Example 1
Firstly, selecting a 304 stainless steel workpiece, removing oil stains on the surface of the stainless steel workpiece by ethanol ultrasonic treatment, and then performing sand blasting roughening treatment to achieve uniform surface roughness without reflection; finally, the mixture is dried for 2 hours at 90 ℃ for standby.
Step two, fe is used 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 (see figure 1) as a coating raw material with the grain diameter of 53-150 mu m, spraying on the surface of the substrate after the sand blasting roughening treatment by an atmospheric plasma spraying device to obtain Fe 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 The high entropy alloy coating has a thickness of 400 μm. The spraying parameters are as follows: the distance between the plasma spray gun and the substrate is 140mm, the spraying voltage is 72.5V, the spraying current is 620A, the powder feeding rate is 35g/min, the argon flow is 30Slpm, and the hydrogen flow is 8Slpm.
And thirdly, carrying out heat treatment on the prepared high-entropy alloy coating in a vacuum heat treatment furnace at 780 ℃ for 4 hours, and then quenching (the quenching temperature is 15-25 ℃ and the quenching time is 4 hours) to obtain the in-situ authigenic nano precipitated phase enhanced high-entropy alloy coating.
FIG. 1 is Fe 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 Powder morphology graph, from which it can be seen that the high entropy is combinedThe sphericity of the gold powder is good, and good fluidity can be ensured in the spraying process.
Fig. 2 is an SEM image of the surface and the cross section of the in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating prepared in this example, and it can be seen from the image that the interlayer bonding is good and the hard phase is uniformly distributed.
FIG. 3 is an X-ray diffraction chart of the in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating prepared in the present example before and after heat treatment, from which it can be seen that Fe 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 The high-entropy alloy coating has phase transformation in the heat treatment process, and the coating consists of FCC phase, L21 phase and oxide phase, so that the coating performance is improved.
FIG. 4 is a Vickers hardness chart of the in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating prepared in the embodiment before and after heat treatment, and the sprayed Fe can be seen from the chart 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 The hardness of the coating is about 250HV, and the hardness of the coating after heat treatment is about 500 HV.
And carrying out a ball disc reciprocating friction and wear experiment on the prepared coating, wherein the friction ball is a hard alloy ball, the load is 5N, the speed is 220mm/s, and the total sliding distance is 576m. FIG. 5 is a graph showing the wear coefficient of the in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating prepared in this example before and after heat treatment, from which it can be seen that Fe is sprayed 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 The wear coefficient of the coating is about 0.8, and the wear coefficient of the coating after heat treatment is about 0.35.
Comparative example 1
The difference from example 1 is that the spray parameters are: the distance between the plasma spray gun and the substrate is 120mm, the spraying voltage is 71V, the spraying current is 600A, the powder feeding rate is 29g/min, the argon flow is 30Slpm, and the hydrogen flow is 7Slpm.
As a result, it was found that the Vickers hardness of the coating prepared by this comparative example was about 220HV, and the wear factor was about 1.2.
Comparative example 2
The difference from example 1 is that the heat treatment temperature was chosen to be 900 ℃;
as a result, it was found that the Vickers hardness of the coating prepared by this comparative example was about 400HV, and the wear coefficient was about 0.6.
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. A method for preparing an in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating by plasma spraying is characterized in that high-entropy alloy powder is sprayed on a substrate in a plasma spraying mode, and the obtained coating is subjected to vacuum heat treatment and solution treatment to obtain the in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating;
the high-entropy alloy powder is Fe 28.0 Co 29.5 Ni 27.5 Al 8.5 Ti 6.5 ；
The parameters in the plasma spraying process are set as follows: the distance between the plasma spray gun and the substrate is 140mm, the spraying voltage is 72.5V, the spraying current is 620A, the powder feeding speed is 35g/min, the argon flow is 30Slpm, and the hydrogen flow is 8Slpm;
the parameters of the vacuum heat treatment are as follows: the temperature is 780+/-50 ℃ and the time is 3-5h.
2. The method for preparing an in-situ self-generated nano precipitated phase enhanced high-entropy alloy coating by plasma spraying according to claim 1, wherein the particle size of the high-entropy alloy coating powder is 53-150 μm.
3. The method for preparing the in-situ self-generated nano precipitated phase enhanced high entropy alloy coating by plasma spraying according to claim 1, further comprising a process of preprocessing a substrate before the plasma spraying, wherein the preprocessing method comprises the following steps: removing greasy dirt on the surface of the matrix, and then performing sand blasting roughening treatment until the surface roughness is uniform and no reflection exists; finally, the mixture is dried for 2 hours at 90 ℃.
4. The method for preparing an in-situ self-generated nano precipitated phase enhanced high entropy alloy coating according to claim 1, wherein the quenching temperature of the solution treatment is 15-25 ℃.
5. An in-situ self-generated nano precipitated phase enhanced high entropy alloy coating prepared by the method of any one of claims 1-4.
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