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Surface modification method of graphite electrode

A technology of graphite electrode and surface modification, which is applied in the field of graphite electrode manufacturing to achieve good thermal conductivity, improve fire resistance, corrosion resistance and wear resistance, and reduce damage rate

Active Publication Date: 2016-08-24
NANTONG YANGZI CARBON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Purpose of the invention: To overcome the disadvantages of low mechanical strength and poor corrosion resistance of traditional graphite electrodes, and provide a surface modification method for graphite electrodes that are resistant to bending, impact and oxidation

Method used

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Embodiment Construction

[0021] The surface modification method of graphite electrode of the present invention adopts following processing steps:

[0022] 1) Ingredients: Select β-Sic whiskers with a weight ratio of 2%, chopped carbon fibers with a length of 1-5mm at a weight ratio of 5%, pitch, needle coke particles, additives and other raw materials, and mix and knead them together. Form the surface slurry; in addition, the asphalt, needle coke particles, and additives are separately compounded and kneaded to form the core slurry;

[0023] 2) Green molding: Co-extrusion machinery is used to match the double-layer co-extrusion die, so that 10% of the radial size of the entire graphite electrode surface slurry wraps the inner layer of the core slurry, and is jointly pressurized and dried for preforming , to become a composite green body;

[0024] 3) Roasting and impregnation: The composite green body is roasted and impregnated repeatedly for secondary post-curing, the temperature of the air-isolated ...

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Abstract

The invention provides a surface modification method for a graphite electrode. The method comprises the following steps: combining a surface slurry containing silicon carbide silicon carbide and a chopped carbon fiber with a core slurry to obtain a composite blank; roasting, impregnating and curing; and performing graphitization treatment at a proper temperature to obtain the graphite electrode. According to the method provided by the invention, the product has high conductivity and is corrosion-resistant while the bending resistance and impact resistance are obviously improved.

Description

technical field [0001] The invention relates to the manufacturing technology of graphite electrodes. Background technique [0002] Graphite electrodes generally use coke, pitch and some additives as raw materials, and are made through batching, preforming, roasting and impregnation, graphitization treatment, post-processing and other processes. It has good electrical conductivity and corrosion resistance, and is widely used in electric furnaces, electrolysis, and electrochemical processes in metallurgical, chemical and other production enterprises. [0003] Silicon carbide has stable chemical properties, high thermal conductivity, small thermal expansion coefficient, and good wear resistance. In addition to being used as an abrasive, silicon carbide can also be made into advanced refractory materials. [0004] β-Sic is close to diamond, and its smoothness and polishing performance far exceed that of white corundum and α-Sic (black silicon carbide and green silicon carbide);...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/532C04B35/622
Inventor 刘明李志宏周晓红
Owner NANTONG YANGZI CARBON
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