Preparation method of composite ceramic coating

A composite ceramic and coating technology, which is applied in the field of surface coating, can solve the problems of limited application and promotion, high brittleness of materials, and difficulty in achieving material compactness, etc., and achieves the effect of simple spraying process.

Inactive Publication Date: 2018-11-23
曹志欢
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing silicon carbide ceramic coatings are stable compounds with strong covalent bonds, so it is difficult to achieve material densification under high-temperature sintering environment, resulting in the disadvantages of high brittleness, easy cracks and short service life of the material. Further application promotion

Method used

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  • Preparation method of composite ceramic coating
  • Preparation method of composite ceramic coating
  • Preparation method of composite ceramic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Silicon carbide micropowder, nano-tungsten powder, ultrafine graphite powder and sodium carboxymethyl cellulose are ground and mixed in a mortar according to the ratio of 100:3:3:6 by weight; add 100% deionized water and 2 % dispersant, in a planetary ball mill, carry out wet ball milling at a speed of 1500r / min for 18 hours to obtain a uniform suspension; after drying and pulverizing the above suspension, sieve it with a 100-mesh sieve to obtain a mixed powder; The powder is melted at a high temperature of 1500°C for 1.0h to form a molten particle flow, which is sprayed on the surface of the metal substrate at a speed of 1200m / s to obtain a silicon carbide / graphite composite ceramic coating. Table 1 shows the performance evaluation results of the nano-tungsten powder reinforced silicon carbide / graphite composite ceramic coating obtained in this example.

[0021]

Embodiment 2

[0023] Grind and mix silicon carbide micropowder, nano-tungsten powder, ultrafine graphite powder and potassium water glass in a mortar according to the ratio of 100:4:3:8 by weight; add 120% deionized water and 3% dispersing In a planetary ball mill, perform wet ball milling at a speed of 1800r / min for 20 hours to obtain a uniform suspension; after drying and pulverizing the above suspension, sieve it with a 200-mesh sieve to obtain a mixed powder; put the above powder in Melt at a high temperature of 1500°C for 1.5 hours to form a molten particle flow, which is sprayed on the surface of the metal substrate at a speed of 1200m / s to obtain a silicon carbide / graphite composite ceramic coating. Table 2 shows the performance evaluation results of the nano-tungsten powder reinforced silicon carbide / graphite composite ceramic coating obtained in this example.

[0024]

Embodiment 3

[0026] Grind and mix silicon carbide micropowder, nano-tungsten powder, ultrafine graphite powder and hydroxyethyl cellulose in a mortar according to the ratio of 100:6:5:8 by weight; add 100% deionized water and 3% In a planetary ball mill, perform wet ball milling at a speed of 1500r / min for 19 hours to obtain a uniform suspension; after drying and pulverizing the above suspension, sieve it with a 100-mesh sieve to obtain a mixed powder; mix the above powder The body is melted at a high temperature of 1500°C for 1.5 hours to form a molten particle flow, which is sprayed on the surface of the metal substrate at a speed of 1800m / s to obtain a silicon carbide / graphite composite ceramic coating. Table 3 shows the performance evaluation results of the nano-tungsten powder reinforced silicon carbide / graphite composite ceramic coating obtained in this example.

[0027]

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Abstract

The invention discloses a preparation method of a composite ceramic coating. The preparation method comprises the following steps: a, grinding and mixing: uniformly grinding and mixing 100 parts of silicon carbide micro-powder, 3 to 7 parts of nano tungsten powder, 3 to 7 parts of ultrafine graphite powder and 5 to 10 parts of a binding agent to prepare a mixture; b, carrying out wet-process ballmilling: adding de-ionized water which accounts for 80 to 120 percent of the mass of the mixture in step a and a dispersant which accounts for 1 to 3 percent of the mass of the mixture in step a intoa planetary ball mill; carrying out the wet-process ball milling for 18 to 20h according to a rotary speed of 1500 to 1800r/min to obtain a uniform suspension solution. According to the preparation method disclosed by the invention, the silicon carbide micro-powder, the nano tungsten powder, the ultrafine graphite powder and the binding agent are subjected to the wet-process ball milling and dispersion according to a certain ratio to obtain the uniform suspension solution. Then a nano hot spray-coating technology is adopted to obtain the composite ceramic coating. The preparation method disclosed by the invention has the advantages of green and environment-friendly materials and simple spray-coating technology; the obtained composite ceramic coating has the advantages of high temperature resistance, wear resistance, corrosion resistance and the like of a ceramic material, but also has the strength and toughness of a metal material; the composite ceramic coating is a novel composite ceramic coating material.

Description

technical field [0001] The invention belongs to the field of surface coatings, and in particular relates to a preparation method of a composite ceramic coating. Background technique [0002] The existing silicon carbide ceramic coatings are stable compounds with strong covalent bonds, so it is difficult to achieve material densification under high-temperature sintering environment, resulting in the disadvantages of high brittleness, easy cracks and short service life of the material. for further application promotion. Therefore, it is urgent to develop silicon carbide composite ceramic coatings with high strength, high toughness, high temperature resistance, wear resistance and corrosion resistance with micro-nano micro-dense structure. Contents of the invention [0003] 1. Technical problems to be solved [0004] The technical problem to be solved by the present invention is to provide a method for preparing a composite ceramic coating to solve the technical problem. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622
CPCC04B35/565C04B35/62222C04B2235/404C04B2235/425C04B2235/77C04B2235/96
Inventor 曹志欢
Owner 曹志欢
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