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Method for performing surface modification on carbon-based material through metal slurry

A carbon-based material and surface modification technology, which is applied in the field of materials, can solve the problems of low bonding strength between the surface chromium coating and the substrate, large differences in expansion coefficient and elastic modulus, and difficult liquid metal wetting of carbon-based materials. Achieve the effects of easy quality control, firm metallurgical bonding, and low cost

Inactive Publication Date: 2019-03-15
SOUTHWESTERN INST OF PHYSICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a solution for the problems that the carbon-based material is difficult to be wetted by the liquid metal when the carbon-based material is connected with metal Cu and Cu alloy, and the difference in expansion coefficient and elastic modulus between the two is large and the connection is difficult. A method for surface modification of carbon-based materials by metal paste method
The invention can effectively solve the problem of low bonding strength between the surface chromium coating and the substrate of the non-metallic carbon-based material in the diffusion bonding process, and can prepare a high-strength metallic chromium coating on the carbon-based material substrate

Method used

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  • Method for performing surface modification on carbon-based material through metal slurry
  • Method for performing surface modification on carbon-based material through metal slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh the chromium powder, place it in a roller ball mill, use cemented carbide balls or agate balls as the grinding balls, and alcohol as the ball milling medium, and the ball milling is greater than or equal to 8 hours;

[0023] (2) Place the above metal mixed powder in a vacuum oven at 100°C for drying;

[0024] (3) Get a certain amount of metal chromium powder after ball milling and drying, add an appropriate amount of organic binder, use a glue homogenizer to fully mix to obtain a uniform slurry;

[0025] (4) Adjust the gap between the screen printing machine screen and graphite and the specifications of the screen, and print samples with different thicknesses (5 microns, 10 microns and 15 microns);

[0026] (5) Put the printed sample in a vacuum furnace, take a certain temperature and a certain holding time, so that the metal chromium powder can fully react with the graphite, and then cool down at a certain cooling rate to form a dense metal coating . The sp...

Embodiment 2

[0030] (1) Weigh the chromium powder, place it in a roller ball mill, use cemented carbide balls or agate balls as the grinding balls, and alcohol as the ball milling medium, and the ball milling is greater than or equal to 8 hours;

[0031] (2) Place the above metal mixed powder in a vacuum oven at 100°C for drying;

[0032] (3) Get a certain amount of metal chromium powder after ball milling and drying, add an appropriate amount of organic binder, use a glue homogenizer to fully mix to obtain a uniform slurry;

[0033] (4) Adjust the gap between the screen printing machine screen and the carbon fiber reinforced carbon matrix composite material and the specifications of the screen, and print samples with different thicknesses (5 microns, 10 microns and 15 microns);

[0034] (5) Put the printed sample in a vacuum furnace, take a certain temperature and a certain holding time, so that the metal chromium powder can fully react with the carbon fiber-reinforced carbon-based compos...

Embodiment 3

[0038] A method for modifying the surface of a carbon-based material by using a metal slurry method is carried out according to the following steps:

[0039] (1) The chromium powder is weighed, placed in a roller ball mill, with cemented carbide balls or agate balls as the grinding balls, alcohol as the ball milling medium, the ball milling is greater than or equal to 8 hours, and the purity of the chromium is 99.99%;

[0040] (2) Place the above metal mixed powder in a vacuum oven at 100°C for drying;

[0041] (3) Take a certain amount of metal chromium powder after ball milling and drying, add an appropriate amount of organic binder, and use a glue homogenizer to fully mix to obtain a uniform slurry. The organic binder is terpineol + ethyl fiber Plain solution, and terpineol: ethyl cellulose: metallic chromium powder=4; 1; 6;

[0042] (4) The slurry is printed on the surface of the pretreated carbon-based material by screen printing technology, and the thickness of the phot...

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Abstract

The invention discloses a method for performing surface modification on carbon-based material through metal slurry, and aims at solving the problems that the carbon-based material is difficult to wet,difference of expansion coefficients and elasticity modulus between the carbon-based material and Cu is large, and the carbon-based material and the Cu are difficult to connect. The method comprisesthe following steps: configuration of metal powder (weighing, ball milling and drying), preparing of slurry, surface silk-screen printing of the carbon-based material and vacuum sintering. The mass purity of the metal powder is 99.99%; the vacuum sintering temperature and period are respectively 1200 to 1300 DEG C and 30 min to 2 h. The method can produce chromium carbide coating, with excellent bonding strength, on a carbon-based material substrate and can effectively solve the wettability between the carbon-based material and copper, and is low in production cost and suitable for mass manufacture.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for modifying the surface of carbon-based materials by using metal slurry. Background technique [0002] Carbon-based materials have the advantages of high melting point (3400°C), low density and excellent thermal shock resistance, so they are widely used in energy, aerospace, electronics and other fields. Especially under high temperature conditions, such as plasma components in nuclear fusion devices, carbon-based materials have better applications. Most fusion devices at home and abroad, such as foreign TFTR, DIII-D, JT-60U, JET, Tore Supra, W7-X, domestic HL-2A, HT-7, etc., all use carbon-based materials (including graphite and CFC) as the first wall and divertor, ITER has also been designed to use C / C composite materials at the position of the vertical target plate of the divertor in the initial operation stage. The thermal conductivity of carbon-bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/5057C04B41/87C04B35/522C04B35/83C04B41/4558C04B41/4556C04B41/4539C04B41/0072
Inventor 王建豹刘春佳练友运封范刘翔宋久鹏郑国尧蔡立君
Owner SOUTHWESTERN INST OF PHYSICS
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