CN111074190B - MoSi on steel surface2Composite coating and preparation method thereof - Google Patents

MoSi on steel surface2Composite coating and preparation method thereof Download PDF

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CN111074190B
CN111074190B CN201911360419.7A CN201911360419A CN111074190B CN 111074190 B CN111074190 B CN 111074190B CN 201911360419 A CN201911360419 A CN 201911360419A CN 111074190 B CN111074190 B CN 111074190B
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powder
steel
mosi
alloy
laser
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CN111074190A (en
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王洪金
孙顺平
王斌
卢雅琳
李小平
于赟
王江涛
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Suzhou Qingdu Intelligent Technology Co.,Ltd.
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Jiangsu University of Technology
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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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • 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
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/027—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal matrix material comprising a mixture of at least two metals or metal phases or metal matrix composites, e.g. metal matrix with embedded inorganic hard particles, CERMET, MMC.

Abstract

The application discloses steel surface MoSi2A composite coating and a preparation method thereof relate to the technical field of coating materials. The preparation method comprises the following steps: pretreating the surface of the steel; hot dip aluminizing is carried out on the surface of the steel; carrying out ball milling and mixing on Mo powder, Si powder and Y powder to obtain Mo-Si-Y alloy powder; the Mo-Si-Y alloy powder is placed in a powder feeding device matched with a laser, and the surface of the aluminized steel is synchronously fed with powder and scanned with laser to prepare MoSi on the surface of the steel2And (4) composite coating. The application solves the problem of MoSi on the surface of the existing steel2The coating has the problems of low-temperature brittleness and poor high-temperature oxidation resistance, and the high-temperature oxidation resistance of the surface of the steel is improved.

Description

MoSi on steel surface2Composite coating and preparation method thereof
Technical Field
The application belongs to the technical field of coating materials, and particularly relates to MoSi on the surface of steel2A composite coating and a preparation method thereof.
Background
The loss of steel materials caused by corrosion, oxidation and the like is more than trillion yuan per year. The steel surface modification can improve the high-temperature oxidation resistance, the medium corrosion resistance, the wear resistance and the like of the steel. MoSi2Has high melting point (2030 ℃), low density (6.24 multiplied by 103kg/m3), excellent high-temperature oxidation resistance and corrosion resistance, and good electrical conductivity and thermal conductivity, and is one of the most studied metal silicides in recent years. MoSi2The high-temperature alloy has good thermal stability, and has obvious advantages compared with high-temperature alloy and ceramic materials when used at high temperature of 1200-1600 ℃, so that the high-temperature alloy has wide application prospects in the fields of aviation, high-temperature parts of gas turbines, gas combustors, spray pipes, high-temperature filters, spark plug materials and the like.
MoSi2The main bonding modes of (A) are metallic bond and covalent bond, the covalent bond plays a main role at low temperature, MoSi2The ceramic has the properties of high low-temperature brittleness; at medium temperature (400-. Adopting alloying method to treat MoSi2The low-temperature brittleness and medium-temperature oxidation resistance of the material can be improved by modifying the material. Secondly, modified MoSi2The composite coating has an important function for the surface modification of steel, and especially has an important significance for improving the high-temperature oxidation resistance of the steel. At present to MoSi2The method for modifying the material cannot obviously improve the low-temperature brittleness and the medium-temperature oxidation resistance, and the high-temperature oxidation resistance of the steel needs to be improved.
Disclosure of Invention
The embodiment of the application provides a steel surface MoSi2The composite coating and the preparation method thereof solve the problem of MoSi on the surface of the existing steel2The coating has the problems of low-temperature brittleness and poor high-temperature oxidation resistance, and the high-temperature oxidation resistance of the surface of the steel is improved.
In order to achieve the above purpose, the present application mainly provides the following technical solutions:
on one hand, the embodiment of the application provides a steel surface MoSi2The preparation method of the composite coating comprises the following steps:
pretreating the surface of the steel;
hot dip aluminizing is carried out on the surface of the steel;
carrying out ball milling and mixing on Mo powder, Si powder and Y powder to obtain Mo-Si-Y alloy powder; the Mo-Si-Y alloy powder is placed in a synchronous powder feeding device matched with a laser, and the surface of the aluminized steel is synchronously fed with powder and scanned with laser to prepare MoSi on the surface of the steel2And (4) composite coating.
Preferably, the hot-dip aluminizing of the steel surface is: the steel is placed in Al-Si alloy liquid for dip plating, the dip plating time is 1-5 minutes, and the temperature of the Al-Si alloy liquid is 650-.
Preferably, the weight percentage of the Si element in the Al-Si alloy liquid is 6-10%, and the balance is Al and inevitable impurities.
Preferably, when the steel surface is hot dip aluminized, the thickness of the hot dip aluminized layer is 10 to 100 μm.
Preferably, the Mo-Si-Y alloy powder contains 62-72% of Mo powder, 26-37% of Si powder and 0.1-2% of Y powder by mass percent respectively.
Preferably, the powder feeding speed of the powder feeding device is 5-50g/min, and the flow rate of the carrier gas is 2-5L/min.
Preferably, the laser power of the laser scanning is 1.5-2.6KW, and the scanning speed is 5-10 mm/s.
Preferably, the laser scanning adopts multi-pass scanning, and the overlapping rate of the laser scanning is 30%.
Preferably, the steel surface MoSi2The thickness of the composite coating is 200-1500 μm.
On the other hand, the embodiment of the application also provides the MoSi on the surface of the steel material prepared by the preparation method2And (4) composite coating.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. according to the embodiment of the application, the Al-Si alloy is hot-dipped and plated on the surface of the steel, so that an Fe-Al compound layer and an aluminum-silicon dipping and plating layer are formed on the surface of the steel, the alloy layers are continuously distributed, and the components are uniform; then the Al-Si alloy layer and MoSi are mixed2Fully alloying the alloy powder under the conditions of laser rapid heating and rapid cooling to form metallurgically bonded MoSi2A composite alloy layer, solves the existing MoSi2The low-temperature brittleness and the high-temperature oxidation resistance of the coating are poor. The MoSi2The composite alloy layer has excellent interface bonding with steel, presents metallurgical bonding, is macroscopically flat and uniform, has compact composite layer structure, fine crystal grains and MoSi2The composite coating has good toughness and excellent oxidation resistance, thereby remarkably improving the high-temperature oxidation resistance of the surface of the steel.
2. Preparation of examples of the present applicationOf MoSi2The composite alloy layer absorbs oxygen through Al and Si elements and forms Al in situ2O3、SiO2Protective layer thereby effectively increasing MoSi2The oxidation resistance of the composite layer.
3. MoSi prepared by the embodiment of the application2The composite alloy layer is made of MoSi by replacing Si atoms with Al2Covalent bonds are reduced, and metal bonds are increased, so that the metal property is increased, the low-temperature toughness of the alloy is effectively improved, and the cracking tendency of a composite layer is reduced.
Drawings
FIG. 1 is a cross-sectional overall morphology of a 20 steel hot-dip Al-9.5Si layer in example 1 of the present application;
FIG. 2 shows MoSi in example 1 of the present application2A cross-sectional overall topography of the composite coating;
FIG. 3 shows a MoSi-coated layer in example 1 of the present application2After the 20 steel with the composite coating is oxidized for 7 days at 550 ℃, MoSi2A graph of oxidation weight per unit area of the composite coating;
FIG. 4 shows MoSi in example 1 of the present application2An impression map of the composite coating;
FIG. 5 shows MoSi in example 2 of the present application2A cross-sectional overall topography of the composite coating;
FIG. 6 shows MoSi in example 3 of the present application2And (3) a cross-section overall morphology graph of the composite coating.
Detailed Description
The embodiment of the application provides a steel surface MoSi2The composite coating and the preparation method thereof solve the problem of MoSi on the surface of the existing steel2The coating has the problems of low-temperature brittleness and poor high-temperature oxidation resistance, and the high-temperature oxidation resistance of the surface of the steel is improved.
In order to solve the above problems, the technical solution in the embodiment of the present application has the following general idea:
the embodiment of the application provides a steel surface MoSi2The preparation method of the composite coating comprises the following steps:
pretreating the surface of the steel;
hot dip aluminizing is carried out on the surface of the steel;
carrying out ball milling and mixing on Mo powder, Si powder and Y powder to obtain Mo-Si-Y alloy powder; the Mo-Si-Y alloy powder is placed in a powder feeding device matched with a laser, and the surface of the steel after aluminum plating is synchronously fed with powder and scanned with laser to prepare MoSi on the surface of the steel2And (4) composite coating.
According to the embodiment of the application, the Al-Si alloy is hot-dipped and plated on the surface of the steel, so that an Fe-Al compound layer and an aluminum-silicon dipping and plating layer are formed on the surface of the steel, the alloy layers are continuously distributed, and the components are uniform; then the Al-Si alloy layer and MoSi are mixed2Fully alloying the alloy powder under the conditions of laser rapid heating and rapid cooling to form metallurgically bonded MoSi2A composite alloy layer. The MoSi2The composite alloy layer has excellent interface bonding with steel, presents metallurgical bonding, is macroscopically flat and uniform, has compact composite layer structure, fine crystal grains and MoSi2The composite coating has good toughness and excellent oxidation resistance, thereby remarkably improving the high-temperature oxidation resistance of the surface of the steel. The MoSi2The Al and Si elements in the composite alloy layer have obvious effect of improving the oxidation resistance, and can absorb oxygen and form Al in situ2O3、SiO2Protective layer thereby effectively increasing MoSi2The oxidation resistance of the composite layer. Al element to MoSi2The toughness of the composite layer has obvious improvement effect, and the cracking tendency of the composite layer is reduced. MoSi by substituting Si atoms with Al2Covalent bonds are reduced, and metal bonds are increased, so that the metal property is improved, and the low-temperature toughness of the alloy is also effectively improved. The trace element Y can improve MoSi2The microstructure of the composite layer refines grains, enhances the anti-stripping capability of the oxide film on the surface of the composite layer, and obviously improves the oxidation resistance of the composite layer.
Preferably, the hot-dip aluminizing of the steel material surface is: the steel is placed in Al-Si alloy liquid for dip plating, the dip plating time is 1-5 minutes, and the temperature of the Al-Si alloy liquid is 650-. The thickness of the dip coating on the surface of the steel is controlled by controlling the temperature of the Al-Si alloy liquid and the dip coating time, the thickness of the dip coating is preferably 10-100 mu m, the metallurgical bonding of the coating and the steel substrate is realized,conditioning and improving MoSi2Low temperature toughness of the composite layer.
Preferably, the Al — Si alloy liquid contains 6 to 10% by weight of Si element, and the balance Al and inevitable impurities. The Al-Si alloy liquid is subjected to slag removal, degassing and standing, and then is subjected to dip plating.
Preferably, the Mo-Si-Y alloy powder contains 62-72 wt%, 26-37 wt% and 0.1-2 wt% of Mo powder, Si powder and Y powder, respectively.
Preferably, the Mo powder has a purity of 99.9% and a particle diameter of 1 to 5 μm; the purity of Si powder is 99.9%, and the particle diameter is 1-5 μm; the purity of the Y powder is 99.9 percent, and the particle diameter is 1-5 mu m; preferably, a planetary ball mill is adopted to perform ball milling on the Mo powder, the Si powder and the Y powder, the ball milling time is 24h, and the rotating speed is 300 r/min.
Preferably, the powder feeding speed of the powder feeding device is 5-50g/min, and the flow rate of the carrier gas is 2-5L/min.
Preferably, the laser power of the laser scanning is 1.5-2.6KW, and the scanning speed is 5-10 mm/s; the laser scanning adopts multi-pass scanning, and the lapping rate of the laser scanning is 30%.
According to the embodiment of the application, the thickness of the Mo-Si-Y alloy layer is controlled by controlling the powder feeding process and the laser scanning process of the powder feeding device, and MoSi on the surface of the steel material is scanned by laser2The thickness of the composite coating is 200-1500 mu m, the thickness refers to the total thickness of the aluminum layer and the Mo-Si-Y alloy layer which are dipped on the surface of the steel, and the MoSi can be reduced within the thickness range2The low-temperature brittleness of the composite coating improves the high-temperature oxidation resistance.
For better understanding of the above technical solutions, the following detailed descriptions will be provided with reference to the drawings and specific embodiments of the specification, but the present invention is not limited thereto.
Example 1
Providing 20 steel, and pretreating the surface of the steel, wherein the pretreatment comprises the following steps: polishing the surface, removing oxide film, removing oil in 20% NaOH water solution, washing with clear water, removing rust in 5% sulfuric acid solution, and washing with clear waterWashing in ZnCl2Carrying out plating assisting treatment in the aqueous solution, taking out after soaking for ten minutes, putting into an ethanol solution for washing, and drying;
placing the pretreated 20 steel in an Al-9.5Si alloy solution, wherein the temperature of the Al-9.5Si alloy solution is 660 ℃, the dip plating time is 120s, and the thickness of the prepared hot dip aluminum silicon coating is about 40 mu m, which is shown in figure 1;
1255g, 735g and 10g of Mo powder, Si powder and Y powder are respectively weighed and put into a ball mill to be uniformly mixed for 24 hours, and the ball milling rotating speed is 300 r/min. Wherein the purity of the Mo powder is 99.9 percent, and the particle diameter is 1-5 mu m; the purity of Si powder is 99.9%, and the particle diameter is 1-5 μm; the purity of the Y powder is 99.9%, and the particle diameter is 1-5 μm. Placing the mixed powder in a synchronous powder feeding device matched with a laser, carrying out synchronous powder feeding and laser scanning on the surface of the aluminized steel, wherein the powder feeding speed is 20g/min, the carrier gas flow is 4L/min, the laser spot size is 8mm multiplied by 8mm, the laser power is 1.8KW, the scanning speed is 7mm/s, and the prepared MoSi is2The thickness of the composite coating is about 0.8mm, see fig. 2.
Comparative example 1
Providing 20 steel, and pretreating the surface of the steel, wherein the pretreatment comprises the following steps: polishing the surface, removing oxide film, removing oil in 20% NaOH water solution, washing with clear water, removing rust in 5% sulfuric acid solution, washing with clear water, and removing rust in ZnCl2Carrying out plating assisting treatment in the aqueous solution, taking out after soaking for ten minutes, putting into an ethanol solution for washing, and drying;
1255g and 735g of Mo powder and Si powder are respectively weighed and put into a ball mill to be uniformly mixed for 24 hours, and the ball milling rotating speed is 300 r/min. Wherein the purity of the Mo powder is 99.9 percent, and the particle diameter is 1-5 mu m; the purity of Si powder is 99.9%, and the particle diameter is 1-5 μm. Putting the mixed powder into a synchronous powder feeding device matched with a laser, synchronously feeding powder and scanning laser to the surface of the pretreated steel, wherein the powder feeding speed is 20g/min, the carrier gas flow is 4L/min, the laser spot size is 8mm multiplied by 8mm, the laser power is 1.8KW, the scanning speed is 7mm/s, and MoSi is prepared on the surface of 20 steel2And (4) coating.
Comparative example 2
The provision of 20 steels has been found to be,the method for pretreating the surface of the steel comprises the following steps: polishing the surface, removing oxide film, removing oil in 20% NaOH water solution, washing with clear water, removing rust in 5% sulfuric acid solution, washing with clear water, and removing rust in ZnCl2Carrying out plating assisting treatment in the aqueous solution, taking out after soaking for ten minutes, putting into an ethanol solution for washing, and drying;
1255g, 735g and 10g of Mo powder, Si powder and Y powder are respectively weighed and put into a ball mill to be uniformly mixed for 24 hours, and the ball milling rotating speed is 300 r/min. Wherein the purity of the Mo powder is 99.9 percent, and the particle diameter is 1-5 mu m; the purity of Si powder is 99.9%, and the particle diameter is 1-5 μm; the purity of the Y powder is 99.9%, and the particle diameter is 1-5 μm. Putting the mixed powder into a synchronous powder feeding device matched with a laser, synchronously feeding powder and scanning laser to the surface of the pretreated steel, wherein the powder feeding speed is 20g/min, the carrier gas flow is 4L/min, the laser spot size is 8mm multiplied by 8mm, the laser power is 1.8KW, the scanning speed is 7mm/s, and MoSi is prepared on the surface of 20 steel2+0.5Y coating.
MoSi was coated in example 12Composite coated 20 steel, no hot dip coating, MoSi coated in comparative example 12Coated 20 steel and MoSi coated steel without hot dip coating in comparative example 22And after the 20 steel with +0.5Y coating is oxidized for 7 days at 550 ℃, the oxidation weight increase of the alloy layer in unit area is respectively detected, and the oxidation weight increase chart in unit area shown in figure 3 is obtained. As can be seen from FIG. 3, MoSi prepared in example 12The composite coating effectively improves the oxidation resistance of the 20 steel, and the oxidation resistance is far higher than that of MoSi prepared by laser scanning on the surface of the 20 steel without hot dipping2Composite coating and MoSi2+0.5Y composite coating, and trace Y element can improve MoSi2The oxidation resistance of the composite coating.
For MoSi prepared in example 12Performing indentation detection on the composite coating to obtain MoSi shown in figure 42And (5) impression diagram of the composite coating. As can be seen from FIG. 4, MoSi2The indentation of the composite coating has no cracking phenomenon, which shows that the MoSi prepared by the embodiment has no cracking phenomenon2MoSi is effectively improved by the composite coating2Low-temperature toughness of the alloy.
Example 2
Providing 45 steel, and pretreating the surface of the steel, wherein the pretreatment comprises the following steps: polishing the surface, removing oxide film, removing oil in 20% NaOH water solution, washing with clear water, removing rust in 5% sulfuric acid solution, washing with clear water, and removing rust in ZnCl2Carrying out plating assisting treatment in the aqueous solution, taking out after soaking for ten minutes, putting into an ethanol solution for washing, and drying;
placing the pretreated 45 steel in an Al-9.5Si alloy solution, wherein the temperature of the Al-9.5Si alloy solution is 660 ℃, the dip plating time is 120s, and the thickness of the prepared hot dip aluminum silicon coating is about 40 mu m;
1255g, 735g and 10g of Mo powder, Si powder and Y powder are respectively weighed and put into a ball mill to be uniformly mixed for 24 hours, and the ball milling rotating speed is 300 r/min. Wherein the purity of the Mo powder is 99.9 percent, and the particle diameter is 1-5 mu m; the purity of Si powder is 99.9%, and the particle diameter is 1-5 μm; the purity of the Y powder is 99.9%, and the particle diameter is 1-5 μm. Placing the mixed powder in a synchronous powder feeding device matched with a laser, carrying out synchronous powder feeding and laser scanning on the surface of the aluminized steel, wherein the powder feeding speed is 10g/min, the carrier gas flow is 3L/min, the laser spot size is 8mm multiplied by 8mm, the laser power is 2KW, the scanning speed is 5mm/s, and the prepared MoSi is obtained2The thickness of the composite coating was about 1.0mm as shown in fig. 5.
Example 3
Providing H13 steel, and performing pretreatment on the surface of the steel, wherein the pretreatment comprises the following steps: polishing the surface, removing oxide film, removing oil in 20% NaOH water solution, washing with clear water, removing rust in 5% sulfuric acid solution, washing with clear water, and removing rust in ZnCl2Carrying out plating assisting treatment in the aqueous solution, taking out after soaking for ten minutes, putting into an ethanol solution for washing, and drying;
placing the pretreated H13 steel in an Al-9.5Si alloy solution, wherein the temperature of the Al-9.5Si alloy solution is 660 ℃, the dip plating time is 120s, and the thickness of the prepared hot dip aluminum silicon coating is about 40 mu m;
1400g, 594g and 6g of Mo powder, Si powder and Y powder are respectively weighed and placed in a ball mill to be uniformly mixed for 24 hours, and the ball milling rotating speed is 300 r/min. Wherein the purity of the Mo powder is 99.9%, and the particle diameter1-5 μm; the purity of Si powder is 99.9%, and the particle diameter is 1-5 μm; the purity of the Y powder is 99.9%, and the particle diameter is 1-5 μm. Placing the mixed powder in a synchronous powder feeding device matched with a laser, carrying out synchronous powder feeding and laser scanning on the surface of the aluminized steel, wherein the powder feeding speed is 10g/min, the carrier gas flow is 3L/min, the laser spot size is 8mm multiplied by 8mm, the laser power is 2KW, the scanning speed is 8mm/s, and the prepared MoSi is obtained2The thickness of the composite coating was about 0.8mm as shown in fig. 6.
Finally, the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application, and all the technical solutions of the present application should be covered by the claims of the present application.

Claims (9)

1. MoSi on steel surface2The preparation method of the composite coating is characterized by comprising the following steps:
pretreating the surface of the steel;
performing hot dip aluminum plating on the surface of the steel, wherein the hot dip aluminum plating on the surface of the steel comprises the following steps: placing the steel in Al-Si alloy liquid for immersion plating, wherein the immersion plating time is 1-5 minutes, and the temperature of the Al-Si alloy liquid is 650-;
carrying out ball milling and mixing on Mo powder, Si powder and Y powder to obtain Mo-Si-Y alloy powder; the Mo-Si-Y alloy powder is placed in a synchronous powder feeding device matched with a laser, and the surface of the aluminized steel is synchronously fed with powder and scanned with laser to prepare MoSi on the surface of the steel2And (4) composite coating.
2. The production method according to claim 1, wherein the Al-Si alloy liquid contains 6 to 10% by weight of Si element, and the balance is Al and inevitable impurities.
3. The method according to claim 1, wherein the thickness of the dip coating layer is 10 to 100 μm when the steel surface is hot dip aluminized.
4. The preparation method according to claim 1, wherein the Mo-Si-Y alloy powder comprises 62-72 wt%, 26-37 wt% and 0.1-2 wt% of Mo powder, Si powder and Y powder, respectively.
5. The production method according to claim 1, wherein the powder feeding rate of the powder feeding device is 5 to 50g/min and the flow rate of the carrier gas is 2 to 5L/min.
6. The method of claim 1, wherein the laser power of the laser scan is 1.5-2.6KW and the scan speed is 5-10 mm/s.
7. The method for preparing the alloy material according to the claim 1, wherein the laser scanning adopts multi-pass scanning, and the overlapping rate of the laser scanning is 30%.
8. The method according to claim 1, wherein the steel surface MoSi2The thickness of the composite coating is 200-1500 μm.
9. MoSi on steel surface2Composite coating, characterized in that it is produced by the production method according to any one of claims 1 to 8.
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