Method for preparing conductive, magnetic and heat-conducting metal coating on ceramic surface and application of conductive, magnetic and heat-conducting metal coating

Abstract

The invention discloses a method for preparing an electric-conducting, magnetic-conducting and heat-conducting metal coating on a ceramic surface. The method comprises the following steps: S1, uniformly mixing Ni powder, Cu powder and Al powder according to a certain proportion, and drying to ensure the fluidity of the powder in the spraying process; s2, the ceramic matrix is subjected to sand blasting treatment, so that surface stains are removed, the surface roughness is improved, and combination of the coating and the matrix is better facilitated; the base body is fully dried after sand blasting, water stored in ceramic holes is removed, and the situation that in the spraying process, the water is evaporated to break the bonding interface of ceramic and metal is avoided; and S3, spraying the mixed powder on the surface of the dried ceramic matrix through a low-pressure cold power spraying machine. The invention aims to provide a method for preparing an electric-conductive, magnetic-conductive and heat-conductive metal coating on a ceramic surface, and Ni-Cu-Al metal mixed powder with a specific ratio is combined with a cold spraying process to prepare a layer of metal coating which is relatively good in combination degree and has electric-conductive, magnetic-conductive and heat-conductive properties on the ceramic surface.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic electrical conductivity, magnetic conductivity and thermal conductivity, and more specifically, to a method and application of preparing an electrical conductivity, magnetic conductivity and thermal conductivity metal coating on a ceramic surface by using a cold spraying technique. Background Art

[0002] Ceramic metallization refers to the process of firmly adhering a layer of metal film on the surface of ceramics to enable welding between ceramics and metals, or to give ceramics metal properties such as conductivity. Ceramic materials have the advantages of low communication loss, high thermal conductivity, more matching thermal expansion coefficient, high bonding force, high operating temperature, high electrical insulation, high chemical stability and high mechanical strength, but ceramic materials themselves are insulating. To use them in electrical conduction and magnetic conduction, they must be metallized. That is, a layer of metal film that is firmly bonded to the ceramic and not easily melted is applied to the surface of the ceramic by a certain method, so that it can conduct electricity, and then it can be connected to the metal lead or other metal conductive layer through welding technology to form a whole.

[0003] Metallized ceramics can be used in a variety of fields. For example, in the electronics industry, they are used to make electronic circuit substrates, ceramic packaging, etc. In cookware production, ceramic-inlaid metal inner pots can be made, so that the cookware has the excellent properties of both ceramics and metals, such as good thermal conductivity, magnetic conductivity, and resistance to collision and falling.

[0004] Ceramic metallization has many applications in the production of household cookware. For example, a ceramic inlaid metal inner pot has a ceramic layer, a metal layer and a cavity filled with a heat-conducting liquid between the two. The metal layer can be a multi-layer structure, including a magnetic layer and an outer aluminum layer. It has many advantages and can be used in cooking utensils such as rice cookers. There are also ceramic cookware with a self-adhesive transition metal layer, including a ceramic pot body, a self-adhesive transition metal layer and a metal magnetic layer. The self-adhesive transition metal layer contains a self-adhesive metal element. The metal magnetic layer has a variety of options. The preparation method includes the steps of roughening the outer surface of the ceramic pot body. In addition, metal / ceramic composite cookware, the pot body material is a mixed material of metal and ceramic, and the inner surface has a protective coating. It has the advantages of both metal and ceramic inner pots, good thermal conductivity and heat preservation characteristics, high mechanical strength and surface hardness, and is sprayed with a wear-resistant non-stick coating. It has the advantages of high adhesion, scratch resistance, corrosion resistance, and non-stick. Its preparation method is to mix the materials into a pot body and then form a protective coating. These applications fully combine the properties of ceramics and metals, allowing the cookware to maintain the advantages of ceramics such as health, environmental protection, and chemical corrosion resistance, while having better thermal conductivity, magnetic conductivity and other properties to meet different cooking needs and usage scenarios.

[0005] Although ceramic metallization has many applications in the production of cookware, it also faces some problems and challenges. Technically, the thermal expansion coefficients of ceramics and metals are very different, which can easily lead to unstable bonding strength and metal layer shedding. In addition, different metallization methods are complicated. For example, the activated molybdenum-manganese method can improve the bonding strength, but it is costly and complex. The direct copper coating method is difficult to control the oxygen element on the interface and is prone to pores, resulting in unstable performance. At the same time, in some applications, it is difficult to achieve the best balance between conductivity and magnetic permeability. In terms of cost, some metal materials and special additives in the raw materials are expensive, and equipment investment is large. For example, the magnetron sputtering method requires high-precision vacuum equipment. In terms of environmental impact, some processes consume a lot of energy. For example, the Mo-Mn method has a high sintering temperature, and waste treatment requires special technology and equipment, otherwise it will pollute the environment. Summary of the invention

[0006] In view of the above-mentioned defects, the purpose of the present invention is to propose a method for preparing a conductive, magnetic and thermally conductive metal coating on a ceramic surface, using a Ni-Cu-Al metal mixed powder with a specific ratio and combined with a cold spraying process to prepare a metal coating with good bonding degree and conductive, magnetic and thermally conductive properties on the ceramic surface.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] The method for preparing an electrically conductive, magnetic and thermally conductive metal coating on a ceramic surface comprises the following steps:

[0009] S1. After the Ni powder, Cu powder and Al powder are mixed evenly, they are dried to ensure the fluidity of the powder during the spraying process and to avoid pipe clogging during the cold spraying process;

[0010] S2. The ceramic substrate is sandblasted to remove surface stains and increase surface roughness, which is more conducive to the bonding of the coating and the substrate; the substrate is fully dried after sandblasting to remove the moisture stored in the ceramic pores to prevent the evaporation of moisture during the spraying process from breaking the bonding interface between the ceramic and the metal, and a mixed powder is obtained;

[0011] S3. Cold spraying is performed at a pressure of 0.6 to 0.85 MPa and a temperature of 400 to 600° C. to spray the mixed powder onto the surface of the dried ceramic substrate to form a metal coating on the surface of the ceramic substrate.

[0012] Preferably, the mixed powder is sprayed on the dried ceramic substrate surface by a low-pressure cold power sprayer. The cold spraying process parameters are a spray gun pressure of 0.6-0.85 MPa, a working temperature of 400-600°C, a nozzle moving speed of 200-1200 mm / min, and a powder supply rate of 0.5-0.9 g / s.

[0013] Preferably, the Ni powder is pure electrolytic dendritic Ni powder with a particle size of 5 to 100 μm; the Cu powder is pure Cu powder, white copper powder, bronze powder, and the shape is not limited to spherical, dendritic, quasi-spherical, and flaky, with a particle size of 5 to 100 μm; the Al powder is quasi-spherical Al powder with a particle size of 20 to 50 μm.

[0014] Furthermore, the ceramic matrix is ​​any one or more combinations of Al2O3 ceramics, SiC ceramics, ZrO2 ceramics, and Si3N4 ceramics;

[0015] In steps S1 and S2, the drying process is performed at a temperature of 40 to 100°C, a time of 2 to 10 hours, and an air pressure of 0 to 0.1 MPa.

[0016] Furthermore, the Ni powder, Cu powder and Al powder are mixed in a ratio (mass ratio) of (1-10):(1-3):(1-5).

[0017] Furthermore, the thickness of the metal coating is between 300 and 1500 μm.

[0018] A cookware, the surface of which is provided with a metal coating prepared by the above-mentioned method for preparing a metal coating on a ceramic surface.

[0019] One of the above technical solutions includes the following beneficial effects: adding a certain amount of self-adhesive metal powder, i.e., Al metal powder, to the powder formula of the coating is beneficial to the bonding between the coating and the substrate, adding a certain amount of Ni metal powder allows the coating to have magnetic conductivity, and adding a certain amount of Cu powder improves the electrical conductivity of the coating.

[0020] 1. The Ni-Cu-Al coating can be well bonded to the surface of the ceramic matrix, solving the problem of insufficient electrical and thermal conductivity of the ceramic material itself. By adding different metal powders, the performance of the ceramic material is improved in a targeted manner, which not only improves the electrical conductivity but also enhances the thermal conductivity, making it possible for ceramics to be used in the fields of electrical conductivity, magnetic conductivity and thermal conductivity.

[0021] 2. The mixed powder is sprayed on the ceramic substrate after sandblasting and drying using a cold spraying process. This preparation method is relatively simple and efficient and can be carried out at a lower temperature, avoiding possible damage to the ceramic substrate caused by high temperature. At the same time, it can also ensure good bonding strength between the coating and the substrate, making the prepared product have higher stability and reliability.

[0022] 3. Adding self-adhesive metal powder Al to the powder formula greatly promotes the bonding between the coating and the substrate, improving the overall quality and service life of the product. Adding Ni metal powder gives the coating magnetic conductivity, allowing the product to be used in electromagnetic heating scenarios, broadening the scope of use of the product. Adding Cu powder improves the conductivity of the coating, creating conditions for the application of ceramics in fields that require conductivity, such as some special electronic cooking equipment, which may have potential application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The surface microscopic morphology of the Ni-Cu-Al coating prepared in Example 1, in which the copper-red structure is copper powder particles, the gray structure is nickel particles, and the black structure is aluminum particles. From the results of microscopic morphology analysis, the powder particles of the prepared Ni-Cu-Al coating are evenly distributed without obvious segregation phenomenon;

[0024] Figure 2 The magnetic analysis results of the Ni-Cu-Al coating obtained in Example 1 are as follows: Figure 2 It can be found that the prepared Ni-Cu-Al coating has good magnetic conductivity, and the coating and the ceramic substrate can be well combined without the coating falling off;

[0025] Figure 3 This is the polarization curve test result of the Ni-Cu-Al coating prepared in Example 1 in a 3.5wt.% NaCl solution. From the polarization curve test results, it can be seen that the prepared Ni-Cu-Al coating has a smaller corrosion current and a wider passivation area, which proves that the coating has certain corrosion resistance. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] The method for preparing an electrically conductive, magnetic and thermally conductive metal coating on a ceramic surface comprises the following steps:

[0028] S1. After the Ni powder, Cu powder and Al powder are mixed evenly, they are dried to ensure the fluidity of the powder during the spraying process and to avoid pipe clogging during the cold spraying process to obtain a mixed powder;

[0029] S2. The ceramic substrate is sandblasted to remove surface stains and increase surface roughness, which is more conducive to the bonding of the coating and the substrate; the substrate is fully dried after sandblasting to remove the moisture stored in the ceramic pores to prevent the evaporation of water during the spraying process from breaking the bonding interface between the ceramic and the metal;

[0030] S3. Cold spraying is performed at a pressure of 0.6 to 0.85 MPa and a temperature of 400 to 600° C. to spray the mixed powder onto the surface of the dried ceramic substrate to form a metal coating on the surface of the ceramic substrate.

[0031] The Ni-Cu-Al coating can be well bonded to the surface of the ceramic substrate, solving the problem of insufficient electrical and thermal conductivity of the ceramic material itself. By adding different metal powders, the performance of the ceramic material is improved in a targeted manner, which not only improves the electrical conductivity but also enhances the thermal conductivity, providing the possibility for the application of ceramics in the fields of electrical conductivity, magnetic conductivity and thermal conductivity; the mixed powder is sprayed on the ceramic substrate after sandblasting and drying by a cold spraying process. This preparation method is relatively simple and efficient and can be carried out at a lower temperature, avoiding the damage that high temperature may cause to the ceramic substrate. At the same time, it can also ensure good bonding strength between the coating and the substrate, so that the prepared product has high stability and reliability; the addition of self-adhesive metal powder Al to the powder formula greatly promotes the bonding between the coating and the substrate, and improves the overall quality and service life of the product. The addition of Ni metal powder gives the coating magnetic conductivity, allowing the product to be applied to electromagnetic heating scenarios, broadening the scope of use of the product. Adding Cu powder improves the conductivity of the coating, creating conditions for the application of ceramics in fields that require conductivity, such as some special electronic cooking equipment. The coating prepared under this process has a moderate thickness (300-1500μm), a smooth surface, and is not easy to peel off on the ceramic substrate. Under normal circumstances, the powder will absorb moisture in the air, causing the powder to become damp and agglomerated, resulting in poor fluidity, so drying is performed to ensure the fluidity of the powder during the spraying process.

[0032] In addition, the cold spraying process parameters are: gun pressure of 0.6-0.85MPa, working temperature of 400-600°C, nozzle movement speed of 200-1200mm / min, and powder supply rate of 0.5-0.9g / s.

[0033] Furthermore, the Ni powder, Cu powder and Al powder are mixed in a ratio (mass ratio) of (1 to 10): (1 to 3): (1 to 5).

[0034] At this ratio, the proportion of Ni powder determines the magnetic conductivity of the coating, and insufficient Ni powder content affects the magnetic conductivity of the coating. The proportion of Cu powder determines whether the coating has higher conductivity, but the proportion of Cu powder should not be too much to avoid copper overheating, oxidation and bonding during spraying, and produce obvious copper color, which affects the quality of the coating. The content of Al powder determines the degree of bonding between the coating and the ceramic. The addition of an appropriate amount of Al powder is conducive to better bonding of the coating to the surface of the ceramic substrate, but the addition of excessive Al powder may cause the difference in thermal expansion coefficient between the coating and the ceramic substrate to be too large, which may cause the coating to peel off in an environment with a large difference in temperature.

[0035] In addition, the shape of the Ni powder is dendrite-like, and the hardness of Ni is relatively high. If it is a spherical powder particle, it will be difficult to deposit in the coating due to insufficient plastic deformation. Therefore, when the hardness of the metal cannot be changed, changing the shape of the metal powder can allow it to produce greater plastic deformation under the low-pressure cold spraying process, which is conducive to achieving a higher deposition rate, thereby ensuring the magnetic conductivity of the coating.

[0036] More preferably, the Ni powder is pure electrolytic dendrite Ni powder, and the particle size of the Ni powder is 5 to 100 μm.

[0037] The Cu powder is pure Cu powder, white copper powder, bronze powder, and the shape is not limited to spherical, dendritic, quasi-spherical, and flake, with a particle size of 5 to 100 μm;

[0038] The Al powder is spherical Al powder with a particle size of 20 to 50 μm.

[0039] Cu and Al metal powders are relatively soft, so there is no restriction on the shape requirements of these two powders.

[0040] In addition, the ceramic matrix is ​​Al2O3 ceramic, SiC ceramic, ZrO2 ceramic, Si3N4 ceramic; the drying temperature is 40-100°C, and the air pressure is 0-0.1Mpa.

[0041] In addition, the prepared coating has a thickness of 300 to 1500 μm.

[0042] A cookware, the surface of which is coated with a metal coating prepared by the method for preparing a metal coating on a ceramic surface.

[0043] 1. Improve the performance of cookware

[0044] Enhanced thermal conductivity: The good thermal conductivity of the coating allows the pot to transfer heat more quickly during the heating process, reducing cooking time and improving energy efficiency. Whether it is an induction cooker or an open flame stove, it can reach the required cooking temperature faster, allowing the food to be heated evenly and the cooking effect to be better.

[0045] Improved magnetic conductivity: Coatings with magnetic conductivity can make cookware suitable for electromagnetic heating equipment. With the widespread application of electromagnetic cooking technology, such cookware can meet the needs of more consumers and provide users with more heating options.

[0046] Improved conductivity: Although there is relatively little direct need for conductivity in cookware production, a certain degree of conductivity may be helpful in some special cases, such as connection with smart cooking devices or use with sensing elements to achieve more accurate temperature control or other smart functions.

[0047] 2. Enhanced durability and stability

[0048] Strong bonding: Since the coating and the ceramic substrate can be well bonded, the coating is not likely to fall off during the use of the cookware. This can extend the service life of the cookware and reduce performance degradation or safety hazards caused by coating damage.

[0049] Thermal shock resistance: Ceramic materials themselves have good high temperature resistance, and the presence of the coating can further enhance the pot's resistance to thermal shock. During frequent heating and cooling, the pot can maintain structural stability and is not easy to crack or deform.

[0050] Corrosion resistance: Ni (nickel) and Al (aluminum) are both self-passivating materials, which can form a passivation layer when exposed to air. The three metal powders of Ni, Al and Cu (copper) are selected as the formula because these metals have a certain corrosion resistance, whether in acidic, alkaline or humid environments, and have good corrosion resistance, which helps to increase the service life of the coating.

[0051] 3. Expand design and functional possibilities

[0052] Composite cookware: Ceramics with Ni-Cu-Al coating can be combined with other materials to design new composite cookware. For example, adding this coating between the ceramic inner layer and the metal outer layer can not only give play to the health and environmental protection advantages of ceramics, but also take advantage of the strength of metal and the performance characteristics of coating to improve the overall quality of the cookware.

[0053] Smart cookware applications: The conductivity and magnetic conductivity of the coating can be combined with smart sensors or control systems to develop smart cookware with temperature monitoring and automatic heat adjustment functions, providing users with a more convenient and efficient cooking experience.

[0054] In conclusion, Ni-Cu-Al coating has broad application prospects in cookware production, which can bring better performance, durability and functional expansion to cookware and meet consumers' demand for high-quality cooking utensils.

[0055] Example 1

[0056] 1. Electrolytic dendrite pure Ni powder with a particle size of 40 μm, spherical pure Cu powder with a particle size of 40 μm and quasi-spherical pure Al powder with a particle size of 40 μm were mixed evenly in a ratio of 7:3:5 and then vacuum dried in a vacuum drying oven at 60°C for 6 hours to obtain a dry Ni-Cu-Al mixed powder;

[0057] 2. After sandblasting, the Al2O3 ceramic substrate with a size of 20mm*20mm*5mm was vacuum dried in a vacuum drying oven at 60°C for 6h;

[0058] 3. The prepared Ni-Cu-Al mixed powder was sprayed on the Al2O3 ceramic substrate after sandblasting and drying under a cold spraying process with a spray gun pressure of 0.6 MPa, an operating temperature of 500°C, a nozzle movement speed of 400 mm / min, and a powder supply rate of 0.5 g / s to form a Ni-Cu-Al coating.

[0059] 4. The obtained Ni-Cu-Al coating powder particles are evenly distributed without obvious segregation (such as Figure 1 The Ni-Cu-Al coating has good magnetic conductivity, and the coating can be well combined with the Al2O3 ceramic matrix without the coating falling off (as shown in Figure 2). Figure 2 The coating has a smaller corrosion current (1.76×10 -7 A / cm 2 ) and a wider passivation area (445mV), with certain corrosion resistance (such as Figure 3 As shown in Table 2, the thermal diffusion coefficient test results show that the Ni-Cu-Al coating has better thermal conductivity (17.23347 mm 2 / s), which can diffuse the heat on the surface of the ceramic substrate more quickly.

[0060] Example 2

[0061] 1. Electrolytic dendrite pure Ni powder with a particle size of 40 μm, dendrite pure Cu powder with a particle size of 40 μm and spherical pure Al powder with a particle size of 40 μm were mixed evenly in a ratio of 7:5:5 and dried in a vacuum drying oven at 60°C for 6 hours to obtain a dry Ni-Cu-Al mixed powder;

[0062] 2. After sandblasting, the Al2O3 ceramic substrate with a size of 20mm*20mm*5mm was vacuum dried in a vacuum drying oven at 60°C for 6h;

[0063] 3. The prepared Ni-Cu-Al mixed powder was sprayed on the Al2O3 ceramic substrate after sandblasting and drying under a cold spraying process with a spray gun pressure of 0.7 MPa, an operating temperature of 500°C, a nozzle movement speed of 200 mm / min, and a powder supply rate of 0.5 g / s to form a Ni-Cu-Al coating.

[0064] 4. The obtained Ni-Cu-Al coating powder particles are evenly distributed without obvious segregation. The Ni-Cu-Al coating has good magnetic conductivity, and the coating can be well combined with the Al2O3 ceramic matrix without coating shedding. The coating has a small corrosion current (1.66×10 -7 A / cm 2 ) and a wider passivation area (458mV), which has certain corrosion resistance. According to the thermal diffusion coefficient test results, the Ni-Cu-Al coating has better thermal conductivity (18.82256mm 2 / s), which can diffuse the heat on the surface of the ceramic substrate more quickly.

[0065] Example 3

[0066] 1. Electrolytic dendrite pure Ni powder with a particle size of 40 μm, spherical white copper powder with a particle size of 40 μm and quasi-spherical pure Al powder with a particle size of 40 μm were mixed evenly in a ratio of 7:5:5 and dried in a vacuum drying oven at 60°C for 6 hours to obtain a dry Ni-Cu-Al mixed powder;

[0067] 2. After sandblasting, the Al2O3 ceramic substrate with a size of 20mm*20mm*5mm was dried in a vacuum drying oven at 60°C under normal pressure for 6 hours;

[0068] 3. The prepared Ni-Cu-Al mixed powder was sprayed on the ZrO2 ceramic substrate after sandblasting and drying under a cold spraying process with a spray gun pressure of 0.8 MPa, an operating temperature of 600°C, a nozzle movement speed of 800 mm / min, and a powder supply rate of 0.8 g / s to form a Ni-Cu-Al coating.

[0069] 4. The obtained Ni-Cu-Al coating powder particles are evenly distributed without obvious segregation. The Ni-Cu-Al coating has good magnetic conductivity, and the coating can be well combined with the ZrO2 ceramic matrix without coating shedding. The coating has a small corrosion current (8.68×10 -8 A / cm 2 ) and a wider passivation area (462mV), with certain corrosion resistance. The coating made of white copper powder has better corrosion resistance in weak acid environment than the coating made of pure copper powder (corrosion current 4.68×10 -6A / cm 2 , 335mV in the passivation area). According to the thermal diffusion coefficient test results, the Ni-Cu-Al coating has better thermal conductivity (15.754223mm 2 / s), which can diffuse the heat on the surface of the ceramic substrate more quickly.

[0070] Example 4

[0071] 1. Electrolytic dendrite pure Ni powder with a particle size of 10 μm, spherical white copper powder with a particle size of 40 μm and quasi-spherical pure Al powder with a particle size of 40 μm were mixed evenly in a ratio of 7:5:5 and dried in a vacuum drying oven at 60°C for 6 hours to obtain a dry Ni-Cu-Al mixed powder;

[0072] 2. After sandblasting, the Al2O3 ceramic substrate with a size of 20mm*20mm*5mm was dried in a vacuum drying oven at 60°C under normal pressure for 6 hours;

[0073] 3. The prepared Ni-Cu-Al mixed powder was sprayed on the SiC ceramic substrate after sandblasting and drying under a cold spraying process with a spray gun pressure of 0.8 MPa, an operating temperature of 600°C, a nozzle movement speed of 800 mm / min, and a powder supply rate of 0.8 g / s to form a Ni-Cu-Al coating.

[0074] The obtained Ni-Cu-Al coating powder particles are evenly distributed without obvious segregation. The Ni-Cu-Al coating has good magnetic conductivity, and the coating can be well combined with the SiC ceramic substrate without coating shedding. The coating has a small corrosion current (4.54×10 -8 A / cm 2 ) and a wider passivation area (478mV), with certain corrosion resistance. The coating made of white copper powder has better corrosion resistance in weak acid environment than the coating made of pure copper powder (corrosion current 3.88×10 -6 A / cm 2 , 356mV in the passivation area). According to the thermal diffusion coefficient test results, the Ni-Cu-Al coating has better thermal conductivity (14.773225mm 2 / s), which can diffuse the heat on the surface of the ceramic substrate more quickly.

[0075] Comparative Example 1

[0076] This comparative example is only a ceramic substrate (Al2O3 ceramic substrate), and no Ni-Cu-Al coating is sprayed on the surface of the ceramic substrate. The thermal diffusion coefficient analysis results of the ceramic substrate of this comparative example are shown in Table 1 below.

[0077] Table 1 Analysis results of thermal diffusivity of ceramic matrix

[0078]

[0079]

[0080] Table 2 Thermal diffusion coefficient analysis results of the Ni-Cu-Al coating prepared in Example 1

[0081]

[0082] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A method for preparing an electrically conductive, magnetic, and thermally conductive metal coating on a ceramic surface, characterized in that: The method comprises the following steps: S1. After the Ni powder, Cu powder and Al powder are uniformly mixed, the mixture is dried to obtain a mixed powder; S2. The ceramic substrate is sandblasted and then dried; S3. Cold spraying is performed at a pressure of 0.6 to 0.85 MPa and a temperature of 400 to 600° C. to spray the mixed powder onto the surface of the dried ceramic substrate to form a metal coating on the surface of the ceramic substrate.

2. The method for preparing an electrically conductive, magnetic and thermally conductive metal coating on a ceramic surface according to claim 1, characterized in that: The Ni powder, Cu powder and Al powder are mixed in a mass ratio of (1-10):(1-3):(1-5).

3. The method for preparing an electrically conductive, magnetic and thermally conductive metal coating on a ceramic surface according to claim 1, characterized in that: In step S3, a sprayer is used for cold spraying, the movement speed of the nozzle in the sprayer is 200-1200 mm / min, and the powder supply rate is 0.5-0.9 g / s.

4. The method for preparing an electrically conductive, magnetic and thermally conductive metal coating on a ceramic surface according to claim 1, characterized in that: The Ni powder is in a dendrite shape and has a particle size of 5 to 100 μm.

5. The method for preparing an electrically conductive, magnetic and thermally conductive metal coating on a ceramic surface according to claim 1, characterized in that: The Cu powder is any one or more combinations of pure Cu powder, white copper powder and bronze powder; The shape of the Cu powder is any one or more of a combination of spherical, dendritic, quasi-spherical and flake; The particle size of the Cu powder is 5 to 100 μm.

6. The method for preparing an electrically conductive, magnetic and thermally conductive metal coating on a ceramic surface according to claim 1, characterized in that: The Al powder is spherical Al powder with a particle size of 20 to 50 μm.

7. The method for preparing an electrically conductive, magnetic and thermally conductive metal coating on a ceramic surface according to claim 1, characterized in that: The ceramic matrix is ​​any one or more combinations of Al2O3 ceramics, SiC ceramics, ZrO2 ceramics and Si3N4 ceramics.

8. The method for preparing an electrically conductive, magnetic and thermally conductive metal coating on a ceramic surface according to claim 1, characterized in that: In steps S1 and S2, the drying process is performed at a temperature of 40 to 100°C, a time of 2 to 10 hours, and an air pressure of 0 to 0.1 MPa.

9. The method for preparing an electrically conductive, magnetic and thermally conductive metal coating on a ceramic surface according to claim 1, characterized in that: The thickness of the metal coating is 300 to 1500 μm.

10. A cookware, characterized in that: The invention comprises a cookware body and a metal coating on the surface of the cookware body, wherein the metal coating is prepared by using the method for preparing an electrically conductive, magnetic and thermally conductive metal coating on a ceramic surface as described in any one of claims 1 to 9.

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