High-efficiency reducing furnace electrode repairing method

A repair method and reduction furnace technology, applied in the direction of pressure inorganic powder coating, etc., can solve the problems of insufficient electrode strength performance, reduced production efficiency of electrodes, and rebound and loss of particles, so as to achieve unlimited thickness and shape, reduce Subsequent processing amount, effect of low roughness

Inactive Publication Date: 2020-03-27
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With protective gas, oxide inclusions can be reduced, but defects are still unavoidable
In addition, the particle flight speed of these technologies is between 80 and 800m / s, the continuous stacking of particles is not sufficient and the rebound of some particles is lost, resulting in pores in the coating, insufficient bonding force with the surface of the substrate, and insufficient bonding force inside the coating. The service life of the electrode is often affected because the original strength performance of the electrode itself cannot be achieved, and the frequent replacement of the electrode also reduces the production efficiency

Method used

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  • High-efficiency reducing furnace electrode repairing method
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  • High-efficiency reducing furnace electrode repairing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The electrode to be repaired in this embodiment is a pure copper electrode, figure 1 In order to damage the electrode to be repaired, the repair method of the electrode comprises the following steps:

[0038] (1) Clean up the damaged part of the damaged electrode: Use 180#, 320#, 600# SiC sandpaper to polish the damaged electrode until it is bright and the wear marks are uniform;

[0039] (2) Use a specific fixture to fix the damaged electrode and cover it appropriately, and try to expose only the repaired area before starting the repair;

[0040] (3) Use the PS-1000 aerodynamic spraying system of Japan Plasma Corporation, after installing the Laval nozzle, use compressed nitrogen gas as the working carrier gas, and the working pressure is 6MPa; the raw material for spraying is copper powder, and the particle size of the powder is 20-35μm; the spray gun gun The distance between the mouth and the electrode surface is 40cm, the copper powder deposition is controlled at 1...

Embodiment 2

[0043] The electrode to be repaired in this embodiment is a pure copper electrode with a silver coating, Figure 4 In order to damage the electrode to be repaired, the repair method of the electrode comprises the following steps:

[0044] (1) Clean up the damaged part of the damaged electrode: Use 180#, 320#, 600# SiC sandpaper to polish the damaged electrode until it is bright and the wear marks are uniform;

[0045] (2) Use a specific fixture to fix the damaged electrode and cover it appropriately, and try to expose only the repaired area before starting the repair;

[0046] (3) Use the PS-1000 aerodynamic spraying system of Japan Plasma Corporation, after installing the Laval nozzle, use compressed nitrogen gas as the working carrier gas, and the working pressure is 6MPa; the raw material for spraying is copper powder, and the particle size of the powder is 20-35μm; the spray gun gun The distance between the mouth and the electrode surface is 40cm, the copper powder depositi...

Embodiment 3

[0064] Test the bonding strength between the electrode matrix and the sprayed layer after repairing by the repairing methods described in Examples 1-2 and Comparative Examples 1-6. The test method is based on GB / T 8642 Thermal Spraying-Tensile Bonding Strength. The test results See Table 1.

[0065] Table 1

[0066]

[0067]

[0068] It can be seen from Table 1 that the temperature of the carrier gas has a great influence on the bonding strength after repair. For copper and silver, a coating with a bonding strength greater than 60Mpa can be produced at a temperature of 250-350°C.

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Abstract

The invention discloses a reducing furnace electrode repairing method. The reducing furnace electrode repairing method comprises the following steps that firstly, cleaning and grinding treatment is conducted on the surface of a to-be-repaired area on a reducing furnace electrode; secondly, inert gas is used for loading to-be-sprayed particles, and after heating is conducted to 200-800 DEG C, the to-be-sprayed particles are sprayed to the surface of the to-be-repaired area; and thirdly, mechanical machining is conducted on a reducing furnace electrode surface coating according to the actual usage size, and a repaired reducing furnace electrode is obtained. According to the reducing furnace electrode repairing method, a repairing body can be dense, and the bonding strength between the repairing body and an electrode base body material is high; based on the electrode component shape, the electrode material deposition precision can be optimized by controlling the nozzle size, spraying parameters, tracks and the like, and the subsequent machining amount is reduced; the thickness and the shape of the repairing body are not limited, and the reducing furnace electrode repairing method canbe used for repairing of electrodes different in damage degree; applicable materials are wide, a base body and the coating can be repaired at the same time, and efficiency is high; and the spraying process is simple, heat treatment is not needed, cost is low, and the production efficiency is high.

Description

technical field [0001] The invention relates to an electrode repair method, in particular to a high-efficiency reduction furnace electrode repair method. Background technique [0002] As a major producer of polysilicon, China ranks first in the world in terms of output, accounting for about half of the world's total output. Among them, the production of polysilicon, the modified Siemens method is the mainstream technology for producing polysilicon in the world, and its core equipment is a reduction furnace, and the conductive electrode in the reduction furnace is one of the key components that affect the purity of polysilicon. At present, the electrodes used by most domestic manufacturers are made of pure copper, and the surface of the tapered section is provided with a silver coating to reduce the contact resistance between the electrode and the graphite seat, so as to realize the fast and stable start of the reduction furnace (the typical electrode shape is as follows: fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04
CPCC23C24/04
Inventor 黄仁忠黄健叶云谢迎春曾良王高民
Owner GUANGDONG INST OF NEW MATERIALS
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