Method for preparing carbon material surface ceramic coat

A technology of ceramic coating and carbon material, applied in the field of preparation of ceramic coating on the surface of carbon material, can solve the problems of slow deposition speed, complex process, low strength, etc. Effect

Inactive Publication Date: 2010-09-15
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented method allows for easy creation of metal-ceramics by depositing molten aluminum onto an organosilicon resin base plate or other type of carrier beforehand. Then applying this mixture through thermal spray techniques to form layers around the base plate. These layers are then subjected to laser beam machining processes to remove unwanted parts from them. By doing these methods, different types of ceramics may also be made without requiring expensive equipment like plasma torches or sinterers.

Problems solved by technology

This patented technical solution described by this patents involves finding ways to prevent or reduce damage caused by oxygen from certain types of carbons called graphite when exposed to extreme conditions like high temperaturities (above 500°C).

Method used

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preparation example Construction

[0018] A kind of preparation method of carbon material surface ceramic coating of the present invention, it comprises the following steps:

[0019] a. Preparation of slurry: Weigh high-melting carbide (TiC, SiC, ZrC, HfC) powder with a particle size of 200-250 mesh and a melting point higher than 2500°C, add 3-5wt% sugar as a binder, and press The mass ratio of carbide and deionized water is 1:1~1:1.5, add deionized water and stir thoroughly to make various high melting point carbide slurries;

[0020] b. Apply the slurry prepared above evenly on the carbon material substrate with a coating thickness of 0.8-1.2mm, and dry it at 80°C-200°C to make the slurry evenly adhere to the carbon material substrate. A uniform coating material is formed on the carbon material substrate;

[0021] c. Connect the carbon material substrate with the cladding material to the positive pole of the power supply, and connect the welding torch to the negative pole of the power supply. At a current o...

Embodiment 1

[0024] Embodiment 1: a preparation method of a ceramic coating on the surface of a carbon material, which includes the following steps: a. 200 mesh SiC powder is added with 3 to 5 wt% sugar as a binder, and the SiC powder and deionized water are mixed according to the quality of the SiC powder and deionized water. Ratio of 1:1 to 1:1.5, add deionized water and stir thoroughly to make SiC slurry. b. Apply the slurry evenly on the carbon material substrate with a coating thickness of 0.8-1.2mm, and dry it at 200°C to make the slurry evenly adhere to the carbon material substrate and form a uniform coating on the carbon material substrate. layer material. c. Connect the carbon material substrate with the cladding material to the positive pole of the power supply, and apply it on the The cladding material on the carbon material substrate is deposited by TIG, so that the cladding material is melted under the action of arc heat, and after cooling, a SiC ceramic layer closely combin...

Embodiment 2

[0025] Example 2: The difference between this implementation and Example 1 is that step a is: add 250 mesh TiC powder, add 3-5wt% sugar as a binder, and make TiC powder and deionized water at a mass ratio of 1:1 ~1:1.5 ratio, add deionized water and stir well to make TiC slurry. b. Apply the slurry evenly on the carbon material substrate with a coating thickness of 0.8-1.2mm, and dry it at 80°C to make the slurry evenly adhere to the carbon material substrate and form a uniform coating on the carbon material substrate. layer material. Step c is: directly connect the carbon material substrate with the cladding material to the positive electrode of the power supply, under the process parameters of current 160A, arc voltage 15-20V, welding speed 8m / h, argon gas flow rate 6L / min, The cladding material is coated on the carbon material substrate for TIG cladding. Other steps and process conditions are identical with embodiment one. Under the action of arc heat, TiC is melted, and...

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Abstract

The invention relates to a method for preparing a carbon material surface ceramic coat, which comprises the following steps of: uniformly coating the prepared slurry on a carbon material matrix with the coating thickness of 0.8 to 1.2 millimeters, and drying the carbon material matrix to form a uniform coating material on the carbon material matrix; performing TIG deposition on the coating material coated on the carbon material matrix under the process parameters that the current is 120 to 160A, the electric arc voltage is 15 to 20V, the deposition speed is 6 to 8m/h and the argon flow is 5-8L/min so as to melt the coating material under the action of electric arc heat, and cooling the carbon material matrix to obtain a ceramic layer tightly combined with the matrix on the carbon material matrix. The method has the advantages of simple operation, high efficiency, low cost, attractive coat and metallurgical combination with the matrix. The prepared ceramic coat has controllable component, high thickness, oxidization resistance and ablation resistance.

Description

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Claims

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Application Information

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Owner HARBIN INST OF TECH AT WEIHAI
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