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Green preparation method of silicon carbide ceramic powder

A technology of silicon carbide ceramic powder and silicon carbide, which is applied in the field of green preparation of silicon carbide micropowder for fine ceramics, can solve the problems of complex production process, low purity of silicon carbide ceramic powder, and large pollution, and achieve good particle dispersion and composition Easy-to-control, versatile effects

Inactive Publication Date: 2017-03-29
HENAN XINDAXIN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current problems of low purity of silicon carbide ceramic powder, complex manufacturing process and high pollution, the present invention provides a preparation method of silicon carbide ceramic powder with high purity, environmental friendliness and pollution-free

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A green preparation method of silicon carbide ceramic powder, comprising the steps of:

[0025] (1) Take recycled sand from solar crystal silicon wafer cutting waste as raw material, add water (deionized water with conductivity ≤ 80µS / cm) to the raw material until the silicon carbide concentration is 10wt%, stir well and let stand for 20min to remove floating Impurities on the liquid surface are obtained from silicon carbide coarse powder slurry for subsequent use; the selected solar wafer cutting waste is a mixture of GC#1200, GC#1500, and GC#2000, and the SiC content thereof is not less than 98wt%. , D50≤15μm;

[0026] (2) After stirring the silicon carbide coarse powder slurry obtained in step (1) evenly, perform physical purification by flotation, and grind the obtained material for 5 minutes in a vertical grinder, then perform flotation again and scrape off the black matter on the surface, Then recirculate the operations of grinding, flotation and scraping off bla...

Embodiment 2

[0031] A green preparation method of silicon carbide ceramic powder, comprising the steps of:

[0032] (1) Take recycled sand from solar crystal silicon wafer cutting waste as raw material, add deionized water (conductivity ≤ 80µS / cm) to the raw material until the silicon carbide concentration is 40wt%, stir evenly and let it stand for 15 minutes to remove floating particles in the liquid Impurities on the surface are obtained from silicon carbide coarse powder slurry for subsequent use; the selected solar wafer cutting waste is GC#2000, in which the SiC content is not less than 98wt%, and D50≤15μm;

[0033] (2) After stirring the silicon carbide coarse powder slurry obtained in step (1) evenly, perform physical purification by flotation, and grind the obtained material for 10 minutes in a vertical grinder, then perform flotation again and scrape off the black matter on the surface, Then recirculate the operations of grinding, flotation and scraping off black matter until the ...

Embodiment 3

[0038] A green preparation method of silicon carbide ceramic powder, comprising the steps of:

[0039] (1) Take recycled sand from solar crystal silicon wafer cutting waste as raw material, add deionized water (conductivity ≤ 80µS / cm) to the raw material until the silicon carbide concentration is 70wt%, stir well and let it stand for 10 minutes to remove the floating in the liquid Impurities on the surface are obtained from silicon carbide coarse powder slurry for subsequent use; the solar wafer cutting waste used is GC#1200, where the SiC content is ≥98wt%, and D50≤15μm;

[0040] (2) After stirring the silicon carbide coarse powder slurry obtained in step (1) evenly, perform physical purification by flotation, and grind the obtained material for 15 minutes in a vertical grinder, then perform flotation again and scrape off the black matter on the surface, Then recirculate the operations of grinding, flotation and scraping off black matter until the D50 of the material obtained...

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Abstract

The invention discloses a green preparation method of silicon carbide ceramic powder. Recycled sand extracted from cutting wastes of solar crystalline silicon wafers is used as a raw material, is subjected to flotation and ground, and is added with a dispersing and purifying reagent to achieve the purposes of improving dispersity of slurry and removing impurities, and therefore, the clean silicon carbide ceramic powder with high purity is prepared.

Description

technical field [0001] The invention belongs to a preparation method of silicon carbide micropowder, in particular to a green preparation method of silicon carbide micropowder for fine ceramics. Background technique [0002] Silicon carbide is an important artificially synthesized inorganic non-metallic material, which has the characteristics of high hardness, high wear resistance, corrosion resistance and good high temperature strength. in the component. Silicon carbide ceramics are made of silicon carbide powder by batching, molding, normal pressure or reaction sintering, and silicon carbide has become a widely used ceramic material. The raw materials used in traditional silicon carbide ceramic powder have high impurity content, and the impurity removal preparation process of acid-base washing is often used. During the preparation process, a large amount of acid-base products are consumed, causing serious environmental pollution. [0003] In addition, the properties of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/626
CPCC04B35/565C04B35/6261C04B2235/77C04B2235/782C04B2235/96C04B2235/9607
Inventor 杨正宏孙毅辛玲陈亚丽夏军任真
Owner HENAN XINDAXIN SCI & TECH
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