CN114481001A - Impact-resistant multilayer metal ceramic coating and preparation method thereof - Google Patents
Impact-resistant multilayer metal ceramic coating and preparation method thereof Download PDFInfo
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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
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- 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
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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
- C23C4/131—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 invention discloses a preparation method of an impact-resistant multilayer metal ceramic coating, which comprises the following steps: and sequentially depositing metal coatings on the substrate by using a thermal spraying technology, and depositing ceramic coatings by using a supersonic speed flame spraying technology until the required number of layers is reached to obtain the impact-resistant multilayer metal ceramic coating. The invention combines a ceramic coating with a metal coating, and then a multilayerThe composite coating with excellent impact resistance is prepared by structural design, wherein, the ceramic coating is prepared by preferably selecting metal ceramic powder, the system compatibility of the metal ceramic powder and the metal coating is better, and when the metal ceramic powder is WC-10Co-4Cr powder, the prepared ceramic coating has excellent compactness. The impact toughness of the impact-resistant multilayer metal ceramic coating prepared by the method of the invention reaches 2825.6kJ/m2The material can be used for bulletproof sheets, bulletproof and explosion-proof square cabins, flight decks on ultra-large ships and the like.
Description
Technical Field
The invention relates to the technical field of functional coatings, in particular to an impact-resistant multilayer metal ceramic coating and a preparation method thereof.
Background
With the rapid improvement of the scientific and technical level of China, the requirements of various fields such as aerospace, rail transit, automobile industry and the like on functional materials are higher and higher. It is important to improve the functionality of the material to be able to survive a particular operating environment. The flight deck, the body armor, the bulletproof and explosion-proof shelter and the like on the ultra-large ship need to be made of materials with excellent impact resistance, and the impact resistance is related to whether key parts are damaged or not and life safety, so that the material has important value for researching the impact resistance of the materials.
Chinese patent publication No. CN102140616A discloses a method for preparing a metal-ceramic composite coating and a gradient structure coating; the invention utilizes a plasma spraying method to prepare a ceramic strengthening phase in the coating, utilizes an electric arc spraying method to prepare a matrix metal phase, and adjusts the structure of the coating by adjusting plasma spraying parameters or electric arc spraying parameters to prepare the metal-ceramic composite coating.
Chinese patent publication No. CN105671476A discloses a treatment method for improving the wear resistance of a thermal spray coating; the method improves the wear resistance of the coating by spraying the WC-10Co-4Cr coating to the wear-resisting plate and assisting with deep cooling and tempering treatment, wherein the deep cooling treatment increases the strength, hardness and toughness of the material.
Chinese patent publication No. CN106011840A discloses a method for preparing an impact-resistant cermet wear-resistant coating, which is a special formulation of impact-resistant wear-resistant coating capable of forming diffusion metallurgical bonding with a substrate on a metal surface by a non-contact reactive cladding enhancement method, but the invention requires a bonding auxiliary agent to uniformly mix mixed metal powder into a paste, and the paste is coated on the substrate to obtain a preset coating, and then the preset coating is dried and preheated before non-contact cladding treatment is performed, which is complicated in steps.
Disclosure of Invention
The invention provides a preparation method of an impact-resistant multilayer metal ceramic coating, which is used for preparing a coating with excellent impact resistance by combining a metal coating and a ceramic coating and designing a multilayer structure.
The technical scheme is as follows:
a preparation method of an impact-resistant multilayer metal ceramic coating comprises the following steps:
and sequentially depositing metal coatings on the substrate by using a thermal spraying technology, and depositing ceramic coatings by using a supersonic flame spraying technology until the required number of layers is reached, thereby preparing the impact-resistant multilayer metal ceramic coating.
According to the invention, the metal coating and the ceramic coating are combined, and the composite coating with excellent mechanical property is prepared through the design of a multilayer structure, wherein the ceramic coating is prepared by preferably selecting metal ceramic powder, and the system compatibility of the metal ceramic powder and the metal coating is better; the multi-layer structure can provide better protection effect than a single-layer system, the tough interlayer (namely the metal coating) in the middle of the multi-layer structure can effectively absorb impact energy, inhibit crack propagation, relieve the stress concentration phenomenon and obviously improve the toughness and the impact resistance of the whole material.
The toughening mechanism of a multi-layer structural toughness layer generally derives from (1) the deflection of cracks at the interlayer interface; (2) the metal coating has better plastic deformation capability and can relieve the interface stress; (3) the crack tip is wrapped by the metal coating, so that the crack tip can be passivated, crack propagation is inhibited, and the toughness and the impact resistance of the coating material are improved.
The substrate includes, but is not limited to, metals, alloys, ceramics, etc., such as 316L stainless steel, 304 stainless steel, silicon carbide, etc.
The substrate is required to be pretreated before depositing the metal coating, and the pretreatment comprises the following steps: at least one of rust removal, oil stain removal and sand blasting coarsening. Cleaning the surface of the matrix by operations of removing rust, removing oil stains and the like to remove impurities on the surface of the matrix; the sand blasting coarsening step can increase the surface roughness of the substrate, and is beneficial to enhancing the bonding force between the coating and the substrate.
Preferably, the surface of the substrate is cleaned by using ethanol, acetone and deionized water, the substrate is roughened by using a sand blasting machine after being dried, and the process parameters of sand blasting roughening are as follows: the air pressure is 0.4-2.0 MPa, the sand blasting time is 30 s-2 min, and the mesh number of sand used for sand blasting is 30-80 meshes.
Preferably, the metal coating is deposited by thermal spraying using a metal wire, an alloy wire, a metal powder or an alloy powder as a raw material.
The thermal spraying technology is electric arc spraying, plasma spraying or supersonic flame spraying.
When the thermal spraying technology is arc spraying, the process parameters are as follows: the current is 50-200A, the voltage is 10-50V, the pressure of compressed air is 0.1-1.5 MPa, the spraying distance is 8-30 cm, and the moving speed of the supersonic electric arc gun is 10-50 mm/s.
When the thermal spraying technology is plasma spraying, the process parameters are as follows: the pressure of the argon gas is 0.3-0.8 MPa, and the flow of the argon gas is 2-5 m3H; hydrogen pressure of 0.2-0.5 MPa and hydrogen flow rate of 0.2-0.5 m3H; the current is 300-600A; the voltage is 45-70V; carrier gas flow of 0.8-1.5 m3H; the spraying distance is 50-150 mm; the spraying speed is 50-80 g/min.
Preferably, the ceramic coating is deposited by taking carbide ceramic powder, oxide ceramic powder or metal ceramic powder as raw materials and performing supersonic flame spraying.
Preferably, the ceramic coating is deposited by taking WC-10Co-4Cr powder as a raw material and performing supersonic flame spraying.
Based on different materials, different thermal spraying technologies are selected to prepare the coating, and a large number of experiments prove that the WC-10Co-4Cr powder is very suitable for a supersonic flame spraying technology, and the prepared WC-10Co-4Cr coating has excellent compactness which is obviously better than that of the coating obtained by plasma spraying. The spray velocity of the supersonic flame spraying is much higher than that of the plasma spraying, and WC-10Co-4Cr powder particles impact on a substrate in a molten state or a semi-molten state at supersonic velocity, so that the coating deposited on the substrate is more compact.
Preferably, the technological parameters of the supersonic flame spraying are as follows: the fuel is kerosene, and the gas flow is 15-20L/min; the oxygen flow is 60-120L/min; the carrier gas is argon or high-purity nitrogen, and the carrier gas flow is 3-7L/min; the powder feeding amount is 40-70 g/min; the air pressure is 0.3-0.8 MPa, and the spraying distance is 300-350 mm.
Preferably, the number of layers is 4. When the number of layers is too large, residual stress between the coatings increases, and the coatings are easily peeled off due to the excessive residual stress.
The invention also provides the impact-resistant multilayer metal ceramic coating prepared by the preparation method of the impact-resistant multilayer metal ceramic coating.
Preferably, the thickness ratio of the single-layer metal coating to the single-layer ceramic coating is 0.3-3: 1. the reasonable thickness design of the metal coating and the ceramic coating can ensure that the impact resistance of the impact-resistant multilayer metal ceramic coating is better.
The impact-resistant multilayer metal ceramic coating can be applied to bulletproof sheets, vehicle-mounted bulletproof and explosion-proof shelter, flight decks on ultra-large ships and the like.
Compared with the prior art, the invention has the beneficial effects that:
(1) the composite coating with excellent impact resistance is prepared by combining the ceramic coating and the metal coating and designing the multilayer structure, wherein the ceramic coating is prepared by preferably selecting the metal ceramic powder, the system compatibility of the metal ceramic powder and the metal coating is better, the multilayer structure can provide better protection effect than a single-layer system, a tough interlayer (namely the metal coating) in the middle of the multilayer structure can effectively absorb impact energy, inhibit crack propagation, relieve the stress concentration phenomenon and obviously improve the toughness and the impact resistance of the whole material.
(2) The WC-10Co-4Cr ceramic coating prepared by the supersonic flame spraying technology has good compactness and is obviously superior to the coating obtained by plasma spraying.
(3) The impact toughness of the impact-resistant multilayer metal ceramic coating reaches 2825.6kJ/m2。
Drawings
FIG. 1 is a scanning electron microscope image of the cross-section of the impact-resistant two-layer cermet coating prepared in example 1.
FIG. 2 is a scanning electron microscope image of the cross-section of the impact-resistant four-layer cermet coating prepared in example 2.
FIG. 3 is a scanning electron microscope image of the cross-section of an impact-resistant six-layer cermet coating prepared in example 3.
Fig. 4 is a cross-sectional scanning electron micrograph of the ceramic coating prepared in comparative example 1.
Detailed Description
The invention is further elucidated with reference to the following figures and examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1
In this embodiment, the substrate is 316L stainless steel with a thickness of about 2mm, and the preparation method of the impact-resistant two-layer cermet coating is as follows:
(1) cleaning the surface of a matrix by using ethanol, acetone and deionized water in sequence, and then carrying out sand blasting and coarsening treatment on the surface of the matrix by using 30-mesh brown corundum sand, wherein in the sand blasting process, the air pressure is 0.5MPa, the sand blasting time is 60s, and the sand blasting process can increase the surface roughness of the matrix and improve the bonding strength of a coating and the matrix;
(2) taking an aluminum wire material as a spraying material to carry out electric arc spraying to deposit an aluminum coating on the pretreated matrix, wherein the electric arc spraying has the following process parameters: the current is 200A, the voltage is 32V, the pressure of compressed air is 0.5MPa, the spraying distance is 20cm, and the moving speed of the supersonic electric arc gun is 20 mm/s;
(3) carrying out supersonic flame spraying on the aluminum coating obtained in the step (2) by taking WC-10Co-4Cr powder as a spraying material to further deposit a WC-10Co-4Cr coating, wherein the technological parameters of the supersonic flame spraying are as follows: the fuel is kerosene, and the flow rate is 18.9L/h; the oxygen flow is 80L/min; the carrier gas is high-purity nitrogen, and the flow rate of the carrier gas is 5L/min; the powder feeding amount is 50 g/min; the air pressure is 0.5MPa, and the spraying distance is 300 mm. And after the spraying is finished, preparing the impact-resistant two-layer metal ceramic coating.
The cross-sectional SEM image of the impact-resistant two-layer metal ceramic coating is shown in figure 1, wherein the ceramic coating is excellent in compactness, and the thickness ratio of the single-layer metal coating to the single-layer ceramic coating is 0.3-3: 1.
example 2
In this embodiment, 316L stainless steel with a thickness of about 2mm is selected as the substrate, and the preparation method of the impact-resistant four-layer metal ceramic coating is as follows:
(1) cleaning the surface of a matrix by using ethanol, acetone and deionized water in sequence, and then carrying out sand blasting and coarsening treatment on the surface of the matrix by using 30-mesh brown corundum sand, wherein in the sand blasting process, the air pressure is 0.5MPa, the sand blasting time is 60s, and the sand blasting process can increase the surface roughness of the matrix and improve the bonding strength of a coating and the matrix;
(2) taking an aluminum wire material as a spraying material to carry out electric arc spraying to deposit an aluminum coating on the pretreated matrix, wherein the electric arc spraying has the following process parameters: the current is 200A, the voltage is 32V, the pressure of compressed air is 0.5MPa, the spraying distance is 20cm, and the moving speed of the supersonic electric arc gun is 20 mm/s;
(3) carrying out supersonic flame spraying on the aluminum coating obtained in the step (2) by taking WC-10Co-4Cr powder as a spraying material to further deposit a WC-10Co-4Cr coating, wherein the technological parameters of the supersonic flame spraying are as follows: the fuel is kerosene, and the flow rate is 18.9L/h; the oxygen flow is 80L/min; the carrier gas is high-purity nitrogen, and the flow rate of the carrier gas is 5L/min; the powder feeding amount is 50 g/min; the air pressure is 0.5MPa, and the spraying distance is 300 mm.
And (4) repeating the step (2) and the step (3) once (with the same technological parameters) to prepare the impact-resistant four-layer metal ceramic coating.
The cross-sectional SEM image of the impact-resistant four-layer metal ceramic coating is shown in FIG. 2, wherein the ceramic coating is excellent in compactness, and the thickness ratio of the single-layer metal coating to the single-layer ceramic coating is 0.3-3: 1.
example 3
In this example, 316L stainless steel with a thickness of about 2mm was selected as the substrate, and the preparation method of the impact-resistant six-layer cermet coating was as follows:
(1) cleaning the surface of a matrix by using ethanol, acetone and deionized water in sequence, and then carrying out sand blasting and coarsening treatment on the surface of the matrix by using 30-mesh brown corundum sand, wherein in the sand blasting process, the air pressure is 0.5MPa, the sand blasting time is 60s, and the sand blasting process can increase the surface roughness of the matrix and improve the bonding strength of a coating and the matrix;
(2) taking an aluminum wire material as a spraying material to carry out electric arc spraying to deposit an aluminum coating on the pretreated matrix, wherein the electric arc spraying has the following process parameters: the current is 200A, the voltage is 32V, the pressure of compressed air is 0.5MPa, the spraying distance is 20cm, and the moving speed of the supersonic electric arc gun is 20 mm/s;
(3) carrying out supersonic flame spraying on the aluminum coating obtained in the step (2) by taking WC-10Co-4Cr powder as a spraying material to further deposit a WC-10Co-4Cr coating, wherein the technological parameters of the supersonic flame spraying are as follows: the fuel is kerosene, and the flow rate is 18.9L/h; the oxygen flow is 80L/min; the carrier gas is high-purity nitrogen, and the flow rate of the carrier gas is 5L/min; the powder feeding amount is 50 g/min; the air pressure is 0.5MPa, and the spraying distance is 300 mm.
And (4) repeating the step (2) and the step (3) twice (with the same technological parameters) to prepare the impact-resistant six-layer metal ceramic coating.
The cross-sectional SEM image of the impact-resistant six-layer metal ceramic coating is shown in FIG. 3, wherein the ceramic coating is excellent in compactness, and the thickness ratio of the single-layer metal coating to the single-layer ceramic coating is (0.3-3): 1.
comparative example 1
In this comparative example, 316L stainless steel with a thickness of about 2mm was used as the substrate, and the preparation method of the ceramic coating was as follows:
(1) cleaning the surface of the matrix by using ethanol, acetone and deionized water in sequence, and then carrying out sand blasting roughening treatment on the surface of the matrix by using 30-mesh brown corundum sand, wherein in the sand blasting process, the air pressure is 0.5MPa, and the sand blasting time is 60 s;
(2) carrying out plasma spraying on the pretreated substrate by taking WC-10Co-4Cr powder as a spraying material to deposit a ceramic coating, wherein the technological parameters of the plasma spraying are as follows: argon pressure is 0.345MPa, helium pressure is 0.827MPa, and current is 800A; the voltage is 40V; the spraying distance is 100 mm; the powder feeding pressure is 0.62 MPa.
The cross-sectional SEM image of the ceramic coating is shown in fig. 4, and it can be seen that the ceramic coating is less dense.
Example 4
In this embodiment, 316L stainless steel with a thickness of about 2mm is selected as the substrate, and the preparation method of the impact-resistant four-layer metal ceramic coating is as follows:
(1) cleaning the surface of a matrix by using ethanol, acetone and deionized water in sequence, and then carrying out sand blasting and coarsening treatment on the surface of the matrix by using 50-mesh brown corundum sand, wherein in the sand blasting process, the air pressure is 0.8MPa, the sand blasting time is 90s, and the sand blasting process can increase the surface roughness of the matrix and improve the bonding strength of a coating and the matrix;
(2) carrying out electric arc spraying on the pretreated substrate by taking Ni wire as a spraying material to deposit a nickel coating, wherein the process parameters of the electric arc spraying are as follows: the current is 200A, the voltage is 32V, the pressure of compressed air is 0.5MPa, the spraying distance is 20cm, and the moving speed of the supersonic electric arc gun is 20 mm/s;
(3) carrying out supersonic flame spraying on the nickel coating obtained in the step (2) by taking WC-10Co-4Cr powder as a spraying material to further deposit a WC-10Co-4Cr coating, wherein the technological parameters of the supersonic flame spraying are as follows: the fuel is kerosene, and the flow rate is 16L/h; the oxygen flow is 100L/min; the carrier gas is high-purity nitrogen, and the flow rate of the carrier gas is 6L/min; the powder feeding amount is 60 g/min; the air pressure is 0.6MPa, and the spraying distance is 330 mm.
And (4) repeating the step (2) and the step (3) once (with the same technological parameters) to prepare the impact-resistant four-layer metal ceramic coating.
Sample analysis
The impact resistance of the coatings of examples 1-3 was measured by the drop weight impact method and the results are shown in Table 1:
TABLE 1 impact resistance test results for the coatings of examples 1-3
| Sample (I) | Coating thickness (μm) | Impact toughness (kJ/m)2) |
| Example 1 | 480 | 2684.2 |
| Example 2 | 620 | 2825.6 |
| Example 3 | 830 | 2738.9 |
As can be seen from the data in the table, the impact toughness of the impact-resistant four-layer metal ceramic coating in the example 2 is the highest and reaches 2825.6kJ/m2In example 1, the impact toughness of the impact-resistant two-layer metal ceramic coating is the lowest and reaches 2684.2kJ/m2And the impact toughness of the impact-resistant six-layer metal ceramic coating in the embodiment 3 is between the two, which reaches 2738.9kJ/m2. The reason that the four layers of metal ceramic coatings have the highest impact toughness is mainly that the thickness of the intermediate toughness interlayer metal Al coating is thicker, and the metal Al coating plays a role in absorbing impact energy and improving the impact resistance in the impact process.
The embodiments described above are intended to illustrate the technical solutions of the present invention in detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modification, supplement or similar substitution made within the scope of the principles of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of an impact-resistant multilayer metal ceramic coating is characterized by comprising the following steps:
and sequentially depositing metal coatings on the substrate by using a thermal spraying technology, and depositing ceramic coatings by using a supersonic flame spraying technology until the required number of layers is reached to obtain the impact-resistant multilayer metal ceramic coating.
2. The method of claim 1, wherein the substrate is pretreated prior to depositing the metal coating, the pretreatment comprising: at least one of rust removal, oil stain removal and sand blasting coarsening.
3. The method for preparing an impact-resistant multilayer cermet coating according to claim 2, characterized in that the process parameters of the blasting coarsening are: the air pressure is 0.4-2.0 MPa, the sand blasting time is 30 s-2 min, and the mesh number of sand used for sand blasting is 30-80 meshes.
4. The method for preparing an impact-resistant multilayer cermet coating according to claim 1, wherein the metal coating is deposited by thermal spraying using metal wire, alloy wire, metal powder or alloy powder as raw material, and the thermal spraying technique is arc spraying, plasma spraying or supersonic flame spraying.
5. The method of claim 1, wherein the ceramic coating is deposited by high-speed flame spraying using a carbide ceramic powder, an oxide ceramic powder or a cermet powder as a raw material.
6. The method for preparing an impact-resistant multilayer cermet coating according to claim 5, wherein the ceramic coating is deposited by high-speed flame spraying using WC-10Co-4Cr powder as raw material.
7. The method for preparing an impact-resistant multilayer cermet coating according to claim 5, wherein the process parameters of the supersonic flame spraying are as follows: the fuel is kerosene, and the gas flow is 15-20L/min; the oxygen flow is 60-120L/min; the carrier gas is argon or high-purity nitrogen, and the carrier gas flow is 3-7L/min; the powder feeding amount is 40-70 g/min; the air pressure is 0.3-0.8 MPa, and the spraying distance is 300-350 mm.
8. The method of claim 1, wherein the number of layers is 4.
9. An impact-resistant multilayer cermet coating obtainable by the process for the preparation of an impact-resistant multilayer cermet coating according to any one of claims 1-8.
10. The impact-resistant multilayer cermet coating according to claim 9, wherein the thickness ratio of the single metal coating to the single ceramic coating in the impact-resistant multilayer cermet coating is 0.3-3: 1.
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