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Method for production of silicon carbide granularity sand special for recrystallized silicon carbide

A production method and silicon carbide technology are applied in the production field of special silicon carbide grain size sand for recrystallized silicon carbide products, which can solve the problems of low tap density, low high temperature flexural strength, low bulk density, etc. The effect of high density, high temperature flexural strength and high bulk density

Inactive Publication Date: 2010-06-23
昌乐鑫源碳化硅微粉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the prior art, the silicon carbide particle size sand used to produce recrystallized silicon carbide products is crushed with a pulverizer, so the silicon carbide particle size sand produced has various shapes, a wide range of particle size distribution, and low tap density (1.8 g / cm 3 The following), using such silicon carbide particle size sand for the production of recrystallized silicon carbide products, the products produced have the disadvantages of low bulk density, no anti-oxidation, high porosity, low compressive strength, low high temperature flexural strength, etc.

Method used

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  • Method for production of silicon carbide granularity sand special for recrystallized silicon carbide
  • Method for production of silicon carbide granularity sand special for recrystallized silicon carbide
  • Method for production of silicon carbide granularity sand special for recrystallized silicon carbide

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Embodiment 1

[0020] like figure 1 As shown, the production method of silicon carbide grain size sand special for recrystallized silicon carbide products includes steps:

[0021] Shaping The silicon carbide particle size sand with a median diameter of 100um is subjected to centrifugal circulation shaping for 5 hours.

[0022] Classification: Classify the grain size sand after shaping treatment, remove the fine powder and coarse powder, and take the silicon carbide grain size sand with a particle size of 80um-150um;

[0023] Purification The separated silicon carbide particle size sand is purified by acid washing and alkali washing respectively with a large amount of sulfuric acid and sodium hydroxide;

[0024] Washing with water, adjust the pH value to 5-6;

[0025] Dehydration, drying After dehydration, drying, drying temperature 120 ℃, time 18 hours, to obtain silicon carbide particle size sand specially used for recrystallized silicon carbide products with smooth surface, silicon carbi...

Embodiment 2

[0027] like figure 1 As shown, the production method of silicon carbide grain size sand special for recrystallized silicon carbide products includes steps:

[0028] Shaping The silicon carbide particle size sand with a median diameter of 80-100um will be shaped by the centrifugal circulation of the shaping machine for 8 hours.

[0029] Classification: Separating the grain size sand after shaping treatment, removing the fine powder and coarse powder, and taking the silicon carbide grain size sand with a particle size of 63um-150um and an average particle size of 100±5um;

[0030] Purification: Purify the separated silicon carbide particle size sand through pickling and alkali washing with excess sulfuric acid and sodium hydroxide respectively;

[0031] Washing with water, adjust the pH value to 5-6;

[0032] Dehydration and drying After dehydration, dry at 140°C for 12 hours to obtain silicon carbide particle size sand specially used for recrystallized silicon carbide product...

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Abstract

The invention discloses a method for the production of silicon carbide granularity sand special for recrystallized silicon carbide, which is surface-smooth silicon carbide granularity sand special for recrystallized silicon carbide, obtained by the steps of shaping, separating, purifying, water-washing, dehydrating and drying the silicon carbide granularity sand with 80-100 microns of median diameter. The method for the production of silicon carbide granularity sand special for recrystallized silicon carbide according to the invention is simple, easy and convenient in operation, the produced granularity sand is centralized in granularity, good in mobility, large in tap density, less in impurities and free from fine powders, and all the silicon carbide produced according to the method has smooth surface and nearly spherical shape and is used for the production of recrystallized silicon carbide, therefore, compared with previous products, the produced product has the advantages of high volume density, small porosity, high oxidation resistance, compressive strength and high-temperature rupture strength, etc.

Description

technical field [0001] The invention relates to a micropowder treatment technology, in particular to a method for producing silicon carbide grain size sand special for recrystallized silicon carbide products. Background technique [0002] Recrystallized silicon carbide products have excellent properties such as high temperature strength, good thermal conductivity, small heat storage, and long service life, and are widely used in ceramics, petrochemicals, aerospace and other industrial sectors. It is used to make ceramic kiln furniture (roller rods, beams, shed boards, high-temperature burners, etc.), and the most typical use is as high-temperature kiln furniture for various industrial kilns, especially suitable for use under high temperature conditions above 1500 ° C. RSIC kiln furniture can significantly improve the filling efficiency. [0003] However, in the prior art, the silicon carbide particle size sand used to produce recrystallized silicon carbide products is crush...

Claims

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Application Information

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IPC IPC(8): C01B31/36
Inventor 刘士文郑明金秦洪亮秦祥生王勇
Owner 昌乐鑫源碳化硅微粉有限公司
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