A kind of preparation method of reaction sintered silicon carbide ceramics

A technology for sintering silicon carbide and silicon carbide, which is applied in the field of preparation of reactive sintered silicon carbide ceramics, can solve the problems of waste of resources, environmental pollution, entrainment and the like, achieves simple process, solves the problems of environmental pollution and waste of resources, and reduces the price of raw materials Effect

Inactive Publication Date: 2011-12-28
JIANGSU TAYAL PHOTOVOLTAIC AUXILIARY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon carbide block materials are generally processed into silicon carbide powder through a series of processes such as crushing, ball milling, screening, water washing, pickling, overflow, etc. Among them, the general carbon removal process for impurity carbon is to use hair in the production process of silicon carbide powder. Bubble method, through the adsorption and separation of silicon carbide and carbon on the surface of the foam, it is inevitable that some silicon carbide powder will be entrained, resulting in mixed waste of silicon carbide and carbon
pollute the environment and cause a lot of waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The present invention is a kind of preparation method of reaction sintered silicon carbide ceramics, and this method comprises the following steps:

[0024] The first step: Add 300g of waste silicon carbide powder, 300g of silicon carbide powder, 100g of binder phenolic resin, and 78g of absolute ethanol as a solvent into the ball mill, wet-mix with the ball mill, and then add 18g of absolute ethanol as a solvent to the mixed powder The solvent content in the medium is 12%;

[0025] Step 2: Put the above mixed powder into a drying oven, dry until the solvent content is 3%, then put the powder into a mold, pressurize 60MPa to form a rough, then crush the rough, and sieve through mechanical vibration;

[0026] The third step: evenly distribute the sieved powder obtained in the previous step in the mold cavity, and then mold it into a green body at 60MPa;

[0027] Step 4: Place the green body obtained in the previous step in a vacuum furnace at 550°C for drying and debind...

Embodiment 2

[0032] On the basis of Example 1, the preferred technical solution of the present invention is a method for preparing reaction sintered silicon carbide ceramics, the method comprising the following steps:

[0033] The first step: Add 200g of waste silicon carbide powder, 400g of silicon carbide powder, 100g of adhesive polyvinyl alcohol, and 80g of solvent water into the ball mill, wet-mix with the ball mill, and then add 44g of solvent water to the mixed powder to reach the solvent content in the mixed powder 15%;

[0034] Step 2: Put the above mixed powder into a drying oven, dry until the solvent content is 10%, then put the powder into a mold, pressurize 130MPa to form a rough, then crush the rough, and sieve through mechanical vibration;

[0035] The third step: evenly distribute the sieved powder obtained in the previous step in the mold cavity, and then mold it into a green body at 130MPa;

[0036] Step 4: Place the green body obtained in the previous step in a vacuum ...

Embodiment 3

[0041] On the basis of Example 2, the preferred technical solution of the present invention also includes a preparation method of reaction sintered silicon carbide ceramics, the method comprising the following steps:

[0042] Step 1: Put 200g of waste silicon carbide powder, 350g of silicon carbide powder, 100g of binder phenolic resin, and 72g of solvent absolute ethanol into the ball mill, wet-mix the ball mill, and then add 34g of solvent absolute ethanol to the mixed powder The solvent content in the medium is 14%;

[0043] Step 2: put the above mixed powder into a drying oven, dry until the solvent content is 6%, then put the powder into a mold, pressurize 100MPa to form a rough, then crush the rough, and sieve through mechanical vibration;

[0044] The third step: evenly distribute the sieved powder obtained in the previous step in the mold cavity, and then mold it into a green body at 100MPa;

[0045] Step 4: Place the green body obtained in the previous step in a vacu...

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PUM

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Abstract

The invention discloses a method for preparing reaction sintered silicon carbide ceramics. Firstly, waste silicon carbide powder, silicon carbide powder material, adhesive and solvent are added into a ball mill in proportion, and then the mixed powder is put into a drying oven to dry, and then Put the powder into the mold, pressurize it into a blank, then crush the blank, sieve, and then evenly distribute the sifted powder in the cavity of the mold, mold it again into a green body, and heat up and dry it after debinding , place the green body in a graphite crucible, add metal silicon into the crucible, put the crucible into a high-temperature vacuum sintering furnace for sintering, and then lower the temperature to obtain a reaction-sintered silicon carbide ceramic. The invention has a simple process and is suitable for large-scale industrial production, and can not only effectively solve the problems of environmental pollution and resource waste caused by a large amount of silicon carbide waste, but also reduce the raw material price of reaction sintered silicon carbide materials.

Description

technical field [0001] The invention relates to a preparation method of reaction sintered silicon carbide ceramics, in particular to a preparation method of reaction sintered silicon carbide ceramics. Background technique [0002] Among all kinds of silicon carbide ceramics, reaction sintered silicon carbide material is an important structural ceramic material, which has a series of advantages such as net size molding, high strength, high hardness, and good corrosion resistance; currently, a reaction sintered silicon carbide is prepared. Series products, such as nozzles, square beams, protective tubes, etc., occupy an important position in my country's structural ceramics industry. At present, the green body raw material is basically α-SiC, plus carbon sources (such as petroleum coke, carbon black, graphite, etc.) Bond the original silicon carbide particles to obtain high-performance silicon carbide ceramics. [0003] The continuous exploitation and use of non-renewable ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 李宏王彭王祎
Owner JIANGSU TAYAL PHOTOVOLTAIC AUXILIARY MATERIAL
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