Method for preparing low-density carbon/carbon composite material surface coating

A carbon composite material and surface coating technology, applied in the direction of heating element materials, etc., can solve the problems of long manufacturing cycle, inapplicability, complex process, etc. simple effect

Active Publication Date: 2013-05-22
XIAN CHAOMA SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patents are all preparation methods for surface coatings of relatively high-density carbon materials, and are not suitable for the atmosphere in crystalline silicon furnaces that have strict requirements on ash content.
[0004] The invention patent CN100567217C announced on December 9, 2009 discloses a method for manufacturing a high-purity solidified felt for a silicon crystal growth furnace. In this method, the green body is densified by chemical vapor deposition, the density is increased, the surface is hardened, and then graphite-containing Powder coating suspension coating, and chemical vapor deposition strengthening treatment, the manufactured high-purity solidified carbon felt is light, high-strength and stable in quality, reliable in use, but the process is complicated and the manufacturing cycle is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) The density is 0.2g / cm 3 The carbon / carbon composite material is used as the green body, and the surface of the green body is machined;

[0022] (2) The phenolic resin glue and the sealing particles are mixed uniformly at a mass ratio of 1:1 to form a suspension, and the phenolic resin glue is a mixture of alcohol and phenolic resin, acetone and phenolic resin. A mixed glue solution or a mixed glue solution of water and water-soluble phenolic resin, the mass percentage of phenolic resin or water-soluble phenolic resin in the phenolic resin glue solution is 10%, and the sealing particles are silicon powder and / or graphite powder, The particle diameter of described silicon powder is 600 orders, and the particle diameter of described graphite powder is 600 orders;

[0023] (3) Spraying the suspension on the surface of the processed green body to form a coating with a thickness of 2 μm;

[0024] (4) Dry the green body with the coating on the surface, place it in an ov...

Embodiment 2

[0028] (1) The density is 1.0g / cm 3 The carbon / carbon composite material is used as the green body, and the surface of the green body is machined;

[0029] (2) The phenolic resin glue and the sealing particles are mixed uniformly at a mass ratio of 20:1 to form a suspension; the phenolic resin glue is a mixture of alcohol and phenolic resin, acetone and phenolic resin A mixed glue solution or a mixed glue solution of water and water-soluble phenolic resin, the mass percent of phenolic resin or water-soluble phenolic resin in the phenolic resin glue solution is 50%, and the sealing particles are silicon powder and / or graphite powder, The particle diameter of described silicon powder is 400 orders, and the particle diameter of described graphite powder is 200 orders;

[0030] (3) Spraying the suspension on the surface of the processed green body to form a coating with a thickness of 26 μm;

[0031] (4) Dry the green body with the coating on the surface, place it in an oven, an...

Embodiment 3

[0035] (1) The density is 0.6g / cm 3 The carbon / carbon composite material is used as the green body, and the surface of the green body is machined;

[0036] (2) The phenolic resin glue and the sealing particles are mixed uniformly at a mass ratio of 10:1 to form a suspension; the phenolic resin glue is a mixture of alcohol and phenolic resin, acetone and phenolic resin A mixed glue solution or a mixed glue solution of water and water-soluble phenolic resin, the mass percent of phenolic resin or water-soluble phenolic resin in the phenolic resin glue solution is 30%, and the sealing particles are silicon powder and / or graphite powder, The particle diameter of described silicon powder is 300 orders, and the particle diameter of described graphite powder is 400 orders;

[0037] (3) Spraying the suspension on the surface of the processed green body to form a coating with a thickness of 50 μm;

[0038] (4) Dry the green body with the coating on the surface, place it in an oven, an...

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Abstract

The invention discloses a method for preparing a low-density carbon / carbon composite material surface coating, which comprises the following steps of: 1, machining a low-density carbon / carbon composite material serving as a blank; 2, preparing suspension; 3, spraying or brushing a coating; 4, curing; and 5, drying and sintering. The method has simple process and good repeatability, can be used for batch production, and has significance for prolonging the service life of the low-density carbon / carbon composite material in high-temperature furnace equipment. The coating prepared by the method has thermal shock resistance and certain oxidation resistance, the coating is combined with the blank firmly, and dust is prevented from falling.

Description

technical field [0001] The invention belongs to the technical field of thermal field material accessories for crystalline silicon equipment, and in particular relates to a method for surface coating of low-density carbon / carbon composite materials. Background technique [0002] In recent years, with the rapid growth of the solar cell market, the monocrystalline silicon and polycrystalline silicon manufacturing industries have expanded rapidly, which has greatly driven the demand for carbon / carbon thermal field material products. Carbon / carbon low-density composite materials are indispensable insulation materials for monocrystalline silicon furnaces, polycrystalline silicon furnaces and high-temperature furnaces in other industries. The working temperature of monocrystalline silicon furnace and polycrystalline silicon furnace is above 1500°C, with a certain degree of vacuum. Due to the limited cleanliness of ore, oxidizing gases such as carbon monoxide and carbon dioxide will...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B3/14C04B41/85
Inventor 肖志超胡振英邵海成侯卫权苏君明陈青华
Owner XIAN CHAOMA SCI TECH
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