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Method for lowering consumption of graphite electrode by depositing amorphous carbon film on surface

A graphite electrode and surface deposition technology, which is applied in the direction of electric heating devices, electrical components, heating by discharge, etc., can solve the problems of affecting the protection effect and use effect, and prone to peeling, so as to avoid peeling and failure, reduce graphite electrode consumption, The effect of strong high temperature oxidation resistance

Inactive Publication Date: 2011-06-22
NANTONG YANGZI CARBON +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN1052878 uses phosphosilicate glass to combine carbides, nitrides and titanium dioxide to make graphite electrode anti-oxidation coatings; Chinese patent CN1994967 prepares ceramic protective films on the surface and pores of graphite carbon sleeves by impregnating oxide solutions; China Patent CN1354206 uses water glass as a binder combined with refractory materials to prepare graphite electrode anti-oxidation coatings. These methods can protect graphite electrodes to a certain extent, but due to the large difference in thermal expansion coefficient between coatings and graphite electrodes, the process of use It is easy to peel off, which directly affects the protection effect and use effect
However, in the prior art, there is no method of utilizing arc ion plating to deposit a carbon film on the surface of graphite electrodes to reduce the consumption of graphite electrodes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Choose an ultra-high power graphite electrode with a diameter of 450mm and a length of 1500mm as the substrate, and process the graphite electrode according to the following process:

[0022] (1) Use a brush and compressed air to remove the dirt on the surface of the graphite electrode, and then use 400 to 1200 # Grind the surface of the graphite electrode with sandpaper, blow it with compressed air, clean it with acetone or alcohol, and dry it with gas for use.

[0023] (2) Fix the graphite electrode with the surface pretreated on the support in the vacuum chamber of the arc ion plating equipment, and the graphite electrode is continuously rotated at a controllable speed under the belt of the motor, and the rotation speed is 5 rpm. The preparation of the amorphous carbon film uses a graphite target, and the distance between the target and the surface of the graphite electrode is 80 mm. Close the vacuum chamber, and use a mechanical pump and a diffusion pump to evacuat...

Embodiment 2

[0029] Choose an ultra-high power graphite electrode with a diameter of 450mm and a length of 1500mm as the substrate, and process the graphite electrode according to the following process:

[0030] The specific operation steps are:

[0031] (1) Use a brush and compressed air to remove the dirt on the surface of the graphite electrode, and then use 400 to 1200 # Grind the surface of the graphite electrode with sandpaper, blow it with compressed air, clean it with acetone or alcohol, and dry it with gas for use.

[0032](2) Fix the graphite electrode with surface pretreatment on the support in the vacuum chamber of the arc ion plating equipment, and the graphite electrode is continuously rotated at a controllable speed under the belt of the motor, and the rotation speed is 50 rpm. The preparation of the amorphous carbon film uses a graphite target, and the distance between the target and the surface of the graphite electrode is 300 mm. Close the vacuum chamber, and use a mech...

Embodiment 3

[0038] Choose an ultra-high power graphite electrode with a diameter of 450mm and a length of 1500mm as the substrate, and process the graphite electrode according to the following process:

[0039] The specific operation steps are:

[0040] (1) Use a brush and compressed air to remove the dirt on the surface of the graphite electrode, and then use 400 to 1200 # Grind the surface of the graphite electrode with sandpaper, blow it with compressed air, clean it with acetone or alcohol, and dry it with gas for use.

[0041] (2) Fix the graphite electrode with the surface pretreated on the support in the vacuum chamber of the arc ion plating equipment, and the graphite electrode is continuously rotated at a controllable speed under the belt of the motor, and the rotation speed is 30 rpm. The preparation of the amorphous carbon film uses a graphite target, and the distance between the target and the surface of the graphite electrode is 200 mm. Close the vacuum chamber, and use a m...

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Abstract

A graphite electrode is an indispensable high-temperature-resistant conducting material in the modern electric furnace steel making technology. Lowering of the oxidation consumption of the graphite electrode plays an important role in lowering the iron and steel smelting cost. The invention provides a method for lowering the consumption of the graphite electrode by depositing amorphous carbon film on a surface. In the method, the amorphous carbon film is deposited on the surface of the graphite electrode at low temperature by taking graphite as a cathode target material by using an arc ion plating technology, is tightly combined with a graphite substrate and has high oxidation resistance. Practical application indicates that the graphite electrode treated by surface deposition of the amorphous carbon film is characterized in that the tonnage steel electrode consumption is lowered by over 20 percent compared with an untreated graphite electrode. The method can be widely applied in the field of iron and steel metallurgical industry.

Description

technical field [0001] The invention belongs to graphite electrode surface treatment and surface modification technology, in particular to a method for preparing a graphite electrode surface protection layer for electric arc furnace steelmaking and refining outside the furnace. Background technique [0002] Graphite electrodes are mainly made of petroleum coke and needle coke as raw materials, coal tar pitch as a binder, and a high-temperature-resistant graphite conductive material made by calcination of raw materials, batching, kneading, pressing, roasting, graphitization and mechanical processing. , has good high temperature performance, low thermal expansion coefficient, strong corrosion resistance and easy processing, and is an indispensable high temperature resistant conductive material in the modern electric furnace steelmaking industry. The normal use of graphite electrodes in the steelmaking process is an important guarantee to ensure the stable operation of electric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/06C23C14/34C04B41/87H05B7/085
Inventor 邹友生徐锋杨晓智刘明
Owner NANTONG YANGZI CARBON