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Production method of silicon carbide ultrafine powder

A technology of silicon carbide micropowder and ultrafine powder, which is applied in the field of silicon carbide micropowder production, can solve the problems of low production efficiency, large water consumption, waste of water resources, etc., and achieve the effects of low production cost, high production efficiency and high product precision

Inactive Publication Date: 2012-02-01
昌乐鑫源碳化硅微粉有限公司
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  • Abstract
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Problems solved by technology

[0003] The production method of sub-micron silicon carbide powder is mainly to prepare suspension, which is obtained by hydraulic classification, and is classified by suspension method. Although the production of sub-micron silicon carbide powder can meet the technical and quality requirements, there are certain restrictions and the purification accuracy is poor. , low production efficiency, large water consumption, waste of water resources, not suitable for large-scale industrial production

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  • Production method of silicon carbide ultrafine powder
  • Production method of silicon carbide ultrafine powder
  • Production method of silicon carbide ultrafine powder

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Embodiment 1

[0016] Such as figure 1 Shown, the silicon carbide superfine micropowder production method comprises steps:

[0017] Mix the silicon carbide micropowder with a particle size (D50)≤0.45 microns and pure water in a weight ratio of 1:5, and stir evenly;

[0018] Grading and grading to obtain silicon carbide ultrafine powder with a particle size D50 value of 0.2um-0.3um;

[0019] Dehydration and drying After dehydration, dry at a temperature of 100°C for 50 hours to obtain superfine silicon carbide powder. Silicon carbide ultrafine powder, the particle size D50 value of the powder is 0.2um-0.3um, the maximum particle size is less than 2um, and the specific surface area is 30-45m 2 / g, purity 98.5wt%, sintering temperature 1900°C, sintering density 3.15g / m 3. .

Embodiment 2

[0021] Such as figure 1 Shown, the silicon carbide superfine micropowder production method comprises steps:

[0022] Mix the silicon carbide powder with a particle size of ≤0.45 microns and water in a weight ratio of 1:8, and stir evenly;

[0023] Classification is a mechanical classification in which the high-pressure fine powder slurry is discharged through the gap between a pair of rotating classification discs, and the graded silicon carbide ultrafine powder has a particle size D50 value of 0.1um-0.2um;

[0024] Dehydration and drying After dehydration, dry at a temperature of 140° C. for 30 hours to obtain superfine silicon carbide powder. The D50 value of the fine powder particle size is 0.1um-0.2um, and the specific surface area is 40-50m 2 / g, purity 98.7wt%, sintering temperature 1860°C, sintering density 3.18g / m 3. .

[0025] Such as figure 2 As shown, the grading device used in the present invention is a submicron silicon carbide powder grading device, which i...

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Abstract

The invention discloses a method for producing silicon carbide ultrafine powder, which comprises mixing silicon carbide powder with a particle size D50≤0.45 microns and water into a silicon carbide powder slurry at a weight ratio of 1:5-8, and stirring evenly; wherein, the silicon carbide powder The slurry is continuously stirred in the mixer, and the high-pressure air pipe continuously inflates and pressurizes the slurry, so that the slurry entering the feed port is a high-pressure silicon carbide micro-powder slurry; the high-pressure silicon carbide micro-powder slurry passes through the classification gap between a pair of grading discs Mechanical grading for discharge classification. Among the pair of grading disks, one is a fixed disk and the other is a rotating disk. The fixed disk is axially compressed on the rotating disk through an elastic pressing device; after dehydration Dried to get silicon carbide superfine powder. The production method disclosed by the invention has the advantages of high efficiency, low production cost, high product precision, large-scale industrial production, and stable quality of the produced silicon carbide ultrafine powder, which can fully meet the technical and quality requirements.

Description

technical field [0001] The invention relates to the production technology of silicon carbide micropowder, in particular to the production method of submicron silicon carbide ultrafine powder with the largest particle less than 2 microns. Background technique [0002] Sub-micron silicon carbide powder is mainly used as raw material for silicon carbide seals and bearings. Silicon carbide seals and bearings have wear-resistant, corrosion-resistant, high-temperature strength, high thermal conductivity, and sintering temperature. Grade, the sintering temperature of this ultrafine silicon carbide powder is 1860-2000 ℃, and it is widely used in aerospace, petrochemical, machinery, sealing, electronic industries, etc. [0003] The production method of sub-micron silicon carbide powder is mainly to prepare suspension, which is obtained by hydraulic classification, and is classified by suspension method. Although the production of sub-micron silicon carbide powder can meet the technic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/36
Inventor 刘士文鞠全胜刘荔王勇
Owner 昌乐鑫源碳化硅微粉有限公司