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Method for preparing carbon material surface ceramic coat

A technology of ceramic coating and carbon material, which is applied in the field of preparation of ceramic coating on the surface of carbon material, can solve the problems of slow deposition rate, long production cycle and complicated process, and achieves large coating thickness, controllable composition and simple operation. Effect

Inactive Publication Date: 2012-07-25
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of these methods are: 1) low efficiency, long production cycle and high manufacturing cost
Example: Vapor deposition method, embedding method, slow deposition rate, low efficiency, and thin coating; sol-gel method has low density and low strength of ceramic coating fired once due to volume shrinkage, and needs to be impregnated repeatedly. Improve the material density and strength, so the preparation cycle is longer, and the coating is prone to cracking during the drying process
2) The process is complicated and the flexibility is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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 0.8-1.2 mm, and dry it at 80°C to 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 curre...

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 0.8-1.2 mm, 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 combi...

Embodiment 2

[0025] Embodiment 2: The difference between this embodiment and Embodiment 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 0.8-1.2 mm, 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: connect the carbon material substrate with the cladding material directly to the positive pole 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 a...

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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 materialmatrix. 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

technical field [0001] The invention relates to a method for preparing a ceramic composite material, in particular to a method for preparing a ceramic coating on the surface of a carbon material. Background technique [0002] Carbon materials have a series of advantages such as low density, high specific strength, thermal shock resistance, ablation resistance, and significant retention of high-temperature and ultra-high-temperature mechanical properties. They have great application potential as thermal structural materials in the aerospace and aviation fields. However, a problem that cannot be ignored is that carbon materials are very easy to be oxidized at high temperatures, and a significant oxidation reaction begins to occur in an oxidizing atmosphere higher than 450 ° C, and the reaction becomes more violent as the temperature increases, thus limiting its application in the high temperature field. widely used. Therefore, solving the problem of high temperature oxidation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/50
Inventor 隋少华温广武宋亮王鑫宇宋允翔夏龙
Owner HARBIN INST OF TECH AT WEIHAI
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