Method for production of silicon carbide granularity sand special for recrystallized silicon carbide

A production method and silicon carbide technology are applied in the production field of special silicon carbide grain size sand for recrystallized silicon carbide products, which can solve the problems of low tap density, low high temperature flexural strength, low bulk density, etc. The effect of high density, high temperature flexural strength and high bulk density

Inactive Publication Date: 2010-06-23
昌乐鑫源碳化硅微粉有限公司
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AI-Extracted Technical Summary

Problems solved by technology

[0003] However, in the prior art, the silicon carbide particle size sand used to produce recrystallized silicon carbide products is crushed with a pulverizer, so the silicon carbide particle size sand produced has various shapes, a wide range of particle size distribution, and low tap density (1.8 g...
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Method used

Centrifugal circulation shaping machine can adopt as shown in Figure 2, comprises the shaping mill 1 driven by power unit, and shaping mill 1 comprises grinding cylinder body 11 and grinding disc, and grinding disc rotation is installed in grinding cylinder body 11; Grinding disc comprises grinding disc The main body 2 and the stirring blocks 21 arranged on the main body 2 of the grinding disc, the stirring blocks 21 are arranged in an annular array on the upper surface of the main body 2 of the grinding disc. The upper part of the grinding cylinder 11 is provided with a negative pressure pipeline 4, which is connected to a separation device such as a grading screen through the negative pressure pipeline. After the silicon carbide particle size sand enters the grinding cylinder 11, the stirring block 21 on the grinding disc body 2 is driven by the rotation to drive the silicon carbide The grain size sand moves, and the silicon carbide grain size sand rubs against each other, passivating the edges and corners of the surface, ma...
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Abstract

The invention discloses a method for the production of silicon carbide granularity sand special for recrystallized silicon carbide, which is surface-smooth silicon carbide granularity sand special for recrystallized silicon carbide, obtained by the steps of shaping, separating, purifying, water-washing, dehydrating and drying the silicon carbide granularity sand with 80-100 microns of median diameter. The method for the production of silicon carbide granularity sand special for recrystallized silicon carbide according to the invention is simple, easy and convenient in operation, the produced granularity sand is centralized in granularity, good in mobility, large in tap density, less in impurities and free from fine powders, and all the silicon carbide produced according to the method has smooth surface and nearly spherical shape and is used for the production of recrystallized silicon carbide, therefore, compared with previous products, the produced product has the advantages of high volume density, small porosity, high oxidation resistance, compressive strength and high-temperature rupture strength, etc.

Technology Topic

Volume densityPorosity +12

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  • Method for production of silicon carbide granularity sand special for recrystallized silicon carbide
  • Method for production of silicon carbide granularity sand special for recrystallized silicon carbide
  • Method for production of silicon carbide granularity sand special for recrystallized silicon carbide

Examples

  • Experimental program(2)

Example Embodiment

[0019] Embodiment one
[0020] like figure 1 As shown, the production method of silicon carbide grain size sand special for recrystallized silicon carbide products includes steps:
[0021] Shaping The silicon carbide particle size sand with a median diameter of 100um is subjected to centrifugal circulation shaping for 5 hours.
[0022] Classification: Classify the grain size sand after shaping treatment, remove the fine powder and coarse powder, and take the silicon carbide grain size sand with a particle size of 80um-150um;
[0023] Purification The separated silicon carbide particle size sand is purified by acid washing and alkali washing respectively with a large amount of sulfuric acid and sodium hydroxide;
[0024] Washing with water, adjust the pH value to 5-6;
[0025] Dehydration, drying After dehydration, drying, drying temperature 120 ℃, time 18 hours, to obtain silicon carbide particle size sand specially used for recrystallized silicon carbide products with smooth surface, silicon carbide particle size sand particle size 80um-150um, average particle size 100±2um Silicon carbide particle size sand, tap density 2.0g/cm 3 , the silicon carbide content is greater than 99wt%.

Example Embodiment

[0026] Embodiment two
[0027] like figure 1 As shown, the production method of silicon carbide grain size sand special for recrystallized silicon carbide products includes steps:
[0028] Shaping The silicon carbide particle size sand with a median diameter of 80-100um will be shaped by the centrifugal circulation of the shaping machine for 8 hours.
[0029] Classification: Separating the grain size sand after shaping treatment, removing the fine powder and coarse powder, and taking the silicon carbide grain size sand with a particle size of 63um-150um and an average particle size of 100±5um;
[0030] Purification: Purify the separated silicon carbide particle size sand through pickling and alkali washing with excess sulfuric acid and sodium hydroxide respectively;
[0031] Washing with water, adjust the pH value to 5-6;
[0032] Dehydration and drying After dehydration, dry at 140°C for 12 hours to obtain silicon carbide particle size sand specially used for recrystallized silicon carbide products with a smooth surface. The particle size of silicon carbide particle size sand is 63um-150um, and the average diameter is 100±5um. , tap density 1.9g/cm 3 , silicon carbide content of 99.3wt%.
[0033] Centrifugal circulation shaping machine can be used as figure 2 As shown, it includes a shaping mill 1 driven by a power device. The shaping mill 1 includes a grinding cylinder body 11 and a grinding disc, and the grinding disc is rotatably installed in the grinding cylinder body 11; the grinding disc includes a grinding disc body 2 and a stirring block 21 arranged on the grinding disc body 2 , the stirring blocks 21 are arranged in an annular array on the upper surface of the grinding disc body 2 . The upper part of the grinding cylinder body 11 is provided with a negative pressure pipeline 4, which is connected to a separation device such as a grading screen through the negative pressure pipeline. The grain size sand moves, and the silicon carbide grain size sand rubs against each other, passivating the edges and corners of the surface, making the surface smooth, and the smooth surface of the silicon carbide grain size sand is in use, and the mechanical properties are greatly improved. The reshaping method can be carried out by collecting the materials after each reshaping and then reshaping to form a cyclic shaping mode. After the shaping is completed, under the action of the induced air flow, the silicon carbide particle size sand after shaping is transported from the negative pressure pipeline 4 to the The separation device classifies the sieve, after separation, the silicon carbide particle size sand with a particle size of 63um-150um and an average diameter of 100±5um is taken, and the silicon carbide particle size sand coarse powder with a particle size greater than 150um is passed through a conveying device such as a screw conveying device from the return pipe 3. Transport it into the grinding cylinder body 11 to continue shaping, and the silicon carbide particle size sand fine powder with a particle size less than 60um is recycled for other purposes.

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