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Method for improving antioxidation performance of graphite electrode with surface modification

A technology of anti-oxidation performance and graphite electrodes, which is applied in the direction of electric heating devices, electrical components, heating through discharge, etc., can solve the problems of graphite electrode loss and other problems, reduce the consumption of steel per ton, ensure the anti-oxidation effect, and achieve excellent anti-oxidation effect Effect

Inactive Publication Date: 2012-06-13
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for surface modification of graphite electrodes to improve oxidation resistance in order to solve the problems of graphite electrode loss caused by electrode side wall oxidation during the smelting process of graphite electrodes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1. Carry out surface pretreatment to the graphite electrode, that is, surface polishing, cleaning and drying;

[0019] Step 2. Fix the graphite electrode in a high-temperature vacuum furnace and embed it in uniformly mixed Si and Al 2 o 3 In the powder, the average particle sizes of the two powders are 52 μm and 43 μm respectively, and their weight ratios are: Si accounts for 85%, Al 2 o 3 Accounted for 15%, of which Al 2 o 3 Used as a penetration enhancer; the vacuum pressure in the furnace is 1.5×10 -3 Pa, enter Ar gas, heat the graphite electrode and embedding powder to 1700 ° C, and keep it warm for 3 hours, after the reaction is complete, cool down in the furnace to obtain a SiC protective layer on the surface of the graphite electrode, and the thickness of the protective layer is 250 μm;

[0020] Step 3, place the graphite electrode prepared in step 2 in the chamber of the vacuum plasma spraying equipment, use the plasma spraying technology to spray SiC ...

Embodiment 2

[0023] Step 1. Carry out surface pretreatment to the graphite electrode, that is, surface polishing, cleaning and drying;

[0024] Step 2. Fix the graphite electrode in a high-temperature vacuum furnace and embed it in uniformly mixed Si and Al 2 o 3 In the powder, the average particle sizes of the two powders are 10 μm and 20 μm respectively, and their weight ratios are: Si accounts for 87.5%, Al 2 o 3 accounted for 12.5, of which Al 2 o 3 Used as a penetration enhancer; the vacuum pressure in the furnace is 3×10 -3 Pa, enter Ar gas, heat the graphite electrode and embedding powder to 1750°C, and keep it warm for 2.5h. After the reaction is complete, cool down in the furnace to obtain a SiC protective layer on the surface of the graphite electrode. The thickness of the protective layer is 40μm;

[0025] Step 3, place the graphite electrode prepared in step 2 in the chamber of the vacuum plasma spraying equipment, use the plasma spraying technology to spray SiC on the sur...

Embodiment 3

[0028] Step 1. Carry out surface pretreatment to the graphite electrode, that is, surface polishing, cleaning and drying;

[0029] Step 2. Fix the graphite electrode in a high-temperature vacuum furnace and embed it in uniformly mixed Si and Al 2 o 3 In the powder, the average particle sizes of the two powders are 92 μm and 61 μm respectively, and their weight ratios are: Si accounts for 90%, Al 2 o3 Accounted for 10%, of which Al 2 o 3 Used as a penetration enhancer; vacuumize the furnace to a pressure of 2.5×10 -3 Pa, enter Ar gas, heat the graphite electrode and embedding powder to 1850 ° C, and keep it warm for 2 hours, after the reaction is complete, cool down in the furnace to obtain a SiC protective layer on the surface of the graphite electrode, and the thickness of the protective layer is 192 μm;

[0030] Step 3, place the graphite electrode prepared in step 2 in the chamber of the vacuum plasma spraying equipment, use the plasma spraying technology to spray SiC o...

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Abstract

The invention discloses a method for improving an antioxidation performance of a graphite electrode with surface modification. The method comprises: a graphite electrode is embedded in Si powder to carry out high-temperature reaction, so that a SiC surface protective layer is obtained; and a vacuum plasma spraying technology is applied to spray a fusing SiC coating on the surface of the obtained SiC protective layer, so that a surface defect of the SiC protective layer obtained by the embedding method is filled up and modified and thus the quality of the surface protective layer is improved. According to the method provided in the invention, surface modification processing is carried out on the graphite electrode, so that the high-temperature antioxidation performance of the graphite electrode can be substantially improved. Moreover, the method can be widely applied to the manufacturing industry of graphite electrodes used for steelmaking of an arc furnace and external refinement.

Description

technical field [0001] The invention belongs to graphite electrode surface treatment and surface modification technology, in particular to a method for improving oxidation resistance by surface modification of graphite electrodes used in electric arc furnace steelmaking and out-of-furnace refining. 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. However, in the high temperature and oxygen blowing environment of iron and steel smelting, graphite electrodes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B7/06C23C4/10C23C4/12C23C4/134
Inventor 徐锋李伟杨晓智
Owner NANJING UNIV OF SCI & TECH
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