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Copper plating technology on graphite powder surface

A technology of graphite powder and copper plating, applied in the field of graphite surface treatment, can solve the problems of uneven mixing of powder metallurgy method, difficult disposal of waste liquid, and high preparation cost, and achieves the effects of short electroplating time, oxidation prevention and simple method.

Inactive Publication Date: 2015-05-06
QINGDAO TAIHAODA CARBON MATERIAL
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Problems solved by technology

At present, the preparation methods of graphite mainly adopt electroless copper plating method and powder metallurgy method. The technology of electroless copper plating method is relatively mature, but the pretreatment process of graphite is complicated, the waste liquid is difficult to handle, and the preparation cost is high; the powder metallurgy method has the problem of mixing materials. Average, copper, graphite interface low bonding strength and other problems

Method used

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Embodiment

[0013] The graphite powder surface copper plating process of the present embodiment comprises the following steps: (1) selecting natural flake graphite with a carbon content of 99% and a particle size of 200 as a raw material, and using the selected graphite raw material with a concentration of sodium hydroxide of 200g / L Soak in the solution for 30 minutes, then wash with water until neutral; (2) Put the graphite in a 20% nitric acid solution and boil for 20 minutes, then wash with water until neutral, and dry at 80°C; (3) Use five Copper sulfate water, distilled water, and sulfuric acid are prepared in a ratio of 1:100:2 to make an electroplating solution, and then graphite is added to control the current density to 9A / dm 2 , the time is 80 minutes, and indirect stirring is carried out during the electroplating process. The weight ratio of the graphite to the electroplating solution is 1:150; (4) After the electroplating is completed, wash with water until neutral, and then us...

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Abstract

The invention discloses a copper plating technology on graphite powder surface. The technology is as below: soaking the selected graphite raw material in a sodium hydroxide solution with concentration of 200 g / L for 30min, and washing with water to a neutral state; boiling the graphite in nitric acid solution with concentration of 20% for 20 min, then washing with water to neutral state, and drying at a temperature of 80 DEG C; preparing a plating solution from blue copperas, distilled water and sulfuric acid in the ratio of 1:100:2, then adding graphite, controlling the current density at 9A / dm<2> for 60-80 min, and indirectly mixing in the electroplating process, wherein the weight of the graphite and the plating solution is 1:150; after plating, washing to a neutral state, conducting passivation treatment by using 0.5% benzotriazole at the temperature of 50 DEG C for 7 min, and drying at 90 DEG C. The method has the advantages of simpleness, short plating time and low cost.

Description

[0001] technical field [0002] The invention belongs to the technical field of graphite surface treatment, and in particular relates to a copper plating process on the surface of graphite powder. [0003] Background technique [0004] Copper and graphite composite materials are widely used materials for brushes and electrical contacts. It mainly uses the excellent electrical and thermal conductivity of copper, and the anti-friction and lubricating effects of graphite. At present, the preparation methods of graphite mainly adopt electroless copper plating method and powder metallurgy method. The technology of electroless copper plating method is relatively mature, but the pretreatment process of graphite is complicated, the waste liquid is difficult to handle, and the preparation cost is high; the powder metallurgy method has the problem of mixing materials. Average, copper, graphite interface low bonding strength and other issues. [0005] Contents of the invention [...

Claims

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Application Information

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IPC IPC(8): C25D3/38C25D5/54C25D5/48
CPCC25D3/38C25D5/48C25D5/54
Inventor 乔帅
Owner QINGDAO TAIHAODA CARBON MATERIAL
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