Preparation method of high-sphericity-degree silicon carbide powder for ceramic membrane

A technology of silicon carbide powder and high sphericity is applied in the field of preparation of silicon carbide powder with high sphericity for ceramic membranes, which can solve the problems of high sintering temperature, poor controllability, uncontrollable particle size, etc., and achieves low calcination temperature. Effect

Inactive Publication Date: 2017-10-13
湖北迪洁膜科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the market, silicon carbide is usually used as an abrasive, so its particles are polygonal and multi-angular. It is used to prepare ceramic membrane materials. The separation efficiency of the ceramic membrane material
[0004] Although the existing silicon carbide powder preparation method can produce silicon carbide powder with high purity, its particle sphericity is low, the particle size distribution is wide, the sintering temperature is high, and the particle size is uncontrollable. Silicon carbide ceramic membrane materials, in the application process of preparing silicon carbide ceramic membranes, often need to undergo ball milling, shaping, powder selection and other processes, the process is cumbersome and the controllability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Pretreatment of silicon powder

[0022] a Mix silicon powder, cellulose ether, and water according to the mass ratio of 200:1:1000, stir evenly, pour it into a measuring cylinder, let it stand for 3 minutes, take the solution below half of the liquid level of the measuring cylinder, and put it in an oven at 105°C The dried silicon powder is obtained.

[0023] b Mix the dried silicon powder obtained in the above steps with hydrofluoric acid at a mass ratio of 1:1, let it stand for 24 hours, wash it with distilled water and dry it.

[0024] (2) Preparation of silicon powder precursor

[0025] The silicon powder obtained in step (1) was mixed with glucose and distilled water according to the mass ratio of 1:3.5:4 for 30 minutes, then placed in a water bath at 90°C for 20 minutes, and finally dried in an oven at 105°C for 12 hours. The samples were ground into powder to obtain silicon powder precursor.

[0026] (3) Carbonization of precursors

[0027] Put the silico...

Embodiment 2

[0033] (1) Pretreatment of silicon powder

[0034] a Mix silicon powder, cellulose ether, and water according to the mass ratio of 200:4:1000, stir evenly, pour it into a measuring cylinder, let it stand for 3 minutes, take the solution below half the liquid level of the measuring cylinder, and put it in an oven at 105°C The dried silicon powder is obtained.

[0035] b Mix the dried silicon powder obtained in the above steps with hydrofluoric acid at a mass ratio of 1:5, let it stand for 24 hours, wash it with distilled water and dry it.

[0036] (2) Preparation of silicon powder precursor

[0037] The silicon powder obtained in step (1) was mixed with glucose and distilled water according to the mass ratio of 1:5:5.5 and stirred for 40 minutes, then placed in a water bath at 90°C for 25 minutes, and finally dried in an oven at 105°C for 20 hours. The samples were ground into powder to obtain silicon powder precursor.

[0038] (3) Carbonization of precursors

[0039] Put t...

Embodiment 3

[0045] (1) Pretreatment of silicon powder

[0046] a Mix silicon powder, cellulose ether, and water according to the mass ratio of 200:8:1000, stir evenly, pour it into a measuring cylinder, let it stand for 3 minutes, take the solution below half of the liquid level of the measuring cylinder, and put it in an oven at 105°C The dried silicon powder is obtained.

[0047] b Mix the dried silicon powder obtained in the above steps with hydrofluoric acid at a mass ratio of 1:10, let it stand for 24 hours, clean it with distilled water and dry it.

[0048] (2) Preparation of silicon powder precursor

[0049] The silicon powder obtained in step (1) was mixed with glucose and distilled water according to the mass ratio of 1:6:6.5 and stirred for 45 minutes, then placed in a water bath at 90°C for 30 minutes, and finally dried in an oven at 105°C for 24 hours. The samples were ground into powder to obtain silicon powder precursor.

[0050] (3) Carbonization of precursors

[0051] ...

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PUM

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Abstract

The invention discloses a preparation method of high-sphericity-degree silicon carbide powder for a ceramic membrane. The preparation method comprises the following steps: (1) pre-treating silicon powder; (2) preparing a silicon powder precursor; (3) carbonizing the precursor; (4) calcining silicon carbide: putting amorphous carbon coated silicon powder particles prepared by step (3) into a high-temperature furnace; raising the temperature to be 800 DEG C under a vacuum condition according to a speed of 10 DEG C / min; raising the temperature to be 1300 DEG C to 1500 DEG C according to a speed of 5 DEG C / min and calcining; keeping the heat for 2h to 3h; naturally cooling to room temperature to obtain the silicon carbide powder. The high-sphericity-degree silicon carbide powder disclosed by the invention has the characteristics of narrow particle size distribution, controllability and high sphericity degree.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic material engineering, and in particular relates to a preparation method of high-sphericity silicon carbide powder for ceramic membranes. Background technique [0002] Due to its stable chemical properties, high thermal conductivity, small thermal expansion coefficient, and good wear resistance, silicon carbide is not only used as an abrasive, but also has a wide range of uses in functional ceramics, advanced refractory materials, and metallurgical raw materials. In particular, the use of silicon carbide to prepare inorganic ceramic membrane materials is widely used in textiles, electronics, metallurgy, petroleum, industrial wastewater, food and other fields due to its high temperature resistance, acid and alkali resistance, and good chemical stability. Silicon carbide is used as a raw material to prepare inorganic ceramic membrane materials, which mainly play a role in separation. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/626
CPCC04B35/565C04B35/62605C04B35/6267
Inventor 徐慢季家友陈常连
Owner 湖北迪洁膜科技有限责任公司
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