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Method for processing cuboid silicon carbide whiskers through natural fine quartz

A cubic silicon carbide and quartz technology, applied in the field of silicon carbide preparation, can solve problems such as poor strength, low yield and purity, and impact, and achieve the effects of reduced impurity content, simple processing methods, and complete reactions

Active Publication Date: 2016-11-09
武汉拓普准晶新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the yield and purity of cubic silicon carbide whiskers are not high at present, and the impurities in cubic silicon carbide whiskers will have adverse effects on its strength.

Method used

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  • Method for processing cuboid silicon carbide whiskers through natural fine quartz
  • Method for processing cuboid silicon carbide whiskers through natural fine quartz

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Mix powdered quartz ore with a diameter not greater than 500 μm and water at a mass ratio of 1:0.5, and adjust the pH value to 7.8, then add polyphosphate with a mass fraction of 0.2%, then precipitate, filter, and filter the sieve The hole diameter is 0.1 mm, and the filtrate is taken.

[0028] (2) The above-mentioned filtrate is centrifuged to obtain a centrifuge, the centrifugation time is 5 min, and the centrifugation factor is 50.

[0029] (3) Dry the above-mentioned centrifuge to obtain powdered quartz concentrate, add carbon powder to the powdered quartz concentrate, wherein, the mass ratio of the powdered quartz concentrate to the carbon powder is 5:3, and then microwave Carbonization treatment, the temperature of carbonization treatment is 1400°C, the time of carbonization treatment is 4h, and then cooled to room temperature, cubic silicon carbide powder can be obtained.

[0030] (4) Put the cubic silicon carbide micropowder into a medium-frequency inducti...

Embodiment 2

[0033] (1) Mix powdered quartz ore with a diameter not greater than 500 μm and water at a mass ratio of 1:0.5, and adjust the pH value to 8.3, then add polyphosphate with a mass fraction of 0.4%, then precipitate, filter, and filter the sieve The hole diameter is 0.5 mm, and the filtrate is taken.

[0034] (2) Centrifuge the above-mentioned filtrate to obtain a centrifuge, the time of centrifugation is 30min, and the centrifugation factor is 300.

[0035] (3) Dry the above-mentioned centrifuge to obtain powdered quartz concentrate, add carbon powder to the powdered quartz concentrate, wherein, the mass ratio of the powdered quartz concentrate to the carbon powder is 5:3, and then microwave Carbonization treatment, the temperature of carbonization treatment is 1500° C., the time of carbonization treatment is 6 hours, and then cooled to room temperature to obtain cubic silicon carbide powder.

[0036] (4) Put the cubic silicon carbide micropowder into a medium-frequency inducti...

Embodiment 3

[0039] (1) Mix powdered quartz ore with a diameter not greater than 500 μm and water at a mass ratio of 1:0.5, and adjust the pH value to 8.0, then add polyphosphate with a mass fraction of 0.3%, then precipitate, filter, and filter the sieve The hole diameter is 0.3mm, and the filtrate is taken.

[0040] (2) The above-mentioned filtrate is centrifuged to obtain a centrifuge, the time of centrifugation is 18min, and the centrifugation factor is 220.

[0041] (3) Dry the above-mentioned centrifuge to obtain powdered quartz concentrate, add carbon powder to the powdered quartz concentrate, wherein, the mass ratio of the powdered quartz concentrate to the carbon powder is 5:3, and then microwave Carbonization treatment, the temperature of carbonization treatment is 1450° C., the time of carbonization treatment is 5 hours, and then cooled to room temperature to obtain cubic silicon carbide powder.

[0042](4) Put the silicon carbide into an intermediate frequency induction heatin...

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Abstract

The invention relates to a method for processing cuboid silicon carbide whiskers through natural fine quartz. The method includes the steps of mixing natural fine quartz with water, adjusting the pH value to be 7.8-8.3, adding a dispersing agent, conducting sedimentation and filtering, taking out filtrate, centrifugally separating the filtrate to obtain centrifugate, drying the centrifugate to obtain natural fine quartz concentrate, adding carbon power to the natural fine quartz concentrate, conducting microwave carbonizing treatment, conducting cooling to the room temperature to obtain cuboid silicon carbide micro powder, putting the cuboid silicon carbide micro powder into a medium-frequency induction heating furnace, conducting heat to 1800-2000 DEG C, and conducting reaction for 6-10 h to obtain the cuboid silicon carbide whiskers. According to the method, reaction is complete, the impurity content is greatly reduced, the cuboid silicon carbide yield and purity are greatly improved, the processing method is simple, and cuboid silicon carbide can be easily prepared on a large scale.

Description

technical field [0001] The invention relates to the field of silicon carbide preparation, in particular to a method for processing cubic silicon carbide whiskers from powdered quartz ore. Background technique [0002] Cubic silicon carbide has high chemical stability, high hardness, high thermal conductivity, low thermal expansion coefficient, wide energy band gap, high electron drift velocity, high electron mobility, special resistance temperature characteristics, etc., so it has anti-wear, High temperature, thermal shock resistance, corrosion resistance, radiation resistance, good semi-conductive properties and other excellent properties, are widely used in electronics, information, precision processing technology, military industry, aerospace, advanced refractory materials, special ceramic materials, advanced grinding materials And and reinforced materials and other fields. Cubic silicon carbide whisker is a single crystal fiber with few defects and a certain aspect rati...

Claims

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Application Information

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IPC IPC(8): C30B29/36C30B29/62C30B1/02
CPCC30B1/02C30B29/36C30B29/62
Inventor 刘少林李志文吴恩宁黄荣权易新林
Owner 武汉拓普准晶新材料有限公司
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