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Modified silicon carbide and preparation method thereof

A silicon carbide and silicon carbide micropowder technology, applied in the field of materials, can solve the problems of unimproved toughness and strength of silicon carbide, high molding pressure, easy damage, etc., and achieve the effects of good fluidity, improved toughness, and improved stability.

Inactive Publication Date: 2020-05-26
湖南太子新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the modification of this method can be applied to grouting, the toughness and strength of silicon carbide after molding have not been improved
[0004] Silicon carbide is widely used in electrode material saggers due to its excellent heat resistance and corrosion resistance, but high-quality silicon carbide materials are brittle and easy to be damaged during production and use, and the molding pressure is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A modified silicon carbide comprises the following components in parts by weight: 80 parts of silicon carbide micropowder, 0.5 part of modifier, 1 part of carbon fiber, and 0.1 part of lanthanum oxide.

[0027] The modifier is a mixture of sulfonic acid polycarboxylate and alumina according to the composition of 1:1;

[0028] The particle size of silicon carbide is 500 mesh, and the fiber length of carbon fiber is in the range of 50-60 microns.

[0029] The preparation method of modified silicon carbide in the present embodiment comprises the following steps:

[0030] (1) Add the modifier and deionized water into the mixing tank according to the solid-to-liquid ratio of 1:100 and mix and stir for 40 minutes;

[0031] (2) Add silicon carbide micropowder, carbon fiber and lanthanum oxide into the mixing tank in step (1), stir and mix for 30 minutes to obtain a mixture;

[0032] (3) Add the mixture obtained in step (2) into a ball mill and grind for 60 minutes to obtain ...

Embodiment 2

[0034] A modified silicon carbide comprises the following components in parts by weight: 100 parts of silicon carbide fine powder, 5 parts of modifier, 10 parts of carbon fiber, and 1 part of lanthanum oxide.

[0035] The modifier is a mixture of sulfonic acid polycarboxylate and aluminum oxide at a ratio of 2:1;

[0036] The particle size of silicon carbide is 450 mesh, and the fiber length of carbon fiber is in the range of 50-60 microns.

[0037] The preparation method of modified silicon carbide in the present embodiment comprises the following steps:

[0038] (1) Add the modifier and deionized water into the mixing tank according to the solid-to-liquid ratio of 1:95 and mix and stir for 40 minutes;

[0039] (2) Add silicon carbide micropowder, carbon fiber and lanthanum oxide into the mixing tank in step (1), stir and mix for 30 minutes to obtain a mixture;

[0040] (3) Add the mixture obtained in step (2) into a ball mill and grind for 60 minutes to obtain a fluid mate...

Embodiment 3

[0042] A modified silicon carbide comprises the following components in parts by weight: 90 parts of silicon carbide micropowder, 3 parts of modifier, 8 parts of carbon fiber, and 0.5 part of lanthanum oxide.

[0043] The modifier is a mixture of sulfonic acid polycarboxylate and aluminum oxide at a ratio of 1.5:1;

[0044] The particle size of silicon carbide is 500 mesh, and the fiber length of carbon fiber is in the range of 50-60 microns.

[0045] The preparation method of modified silicon carbide in the present embodiment comprises the following steps:

[0046] (1) Add the modifier and deionized water into the mixing tank according to the solid-to-liquid ratio of 1:90 and mix and stir for 40 minutes;

[0047] (2) Add silicon carbide micropowder, carbon fiber and lanthanum oxide into the mixing tank in step (1), stir and mix for 30 minutes to obtain a mixture;

[0048] (3) Add the mixture obtained in step (2) into a ball mill and grind for 60 minutes to obtain a fluid ma...

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Abstract

The invention discloses modified silicon carbide and a preparation method thereof. The modified silicon carbide is prepared from 80 to 100 parts of silicon carbide micro powder, 0.5 to 5 parts of modifier, 1 to 10 parts of carbon fiber and 0.1 to 1 part of lanthanum oxide. Sulfonyl polycarboxylate and aluminum oxide are mixed with silicon carbide, modification is carried out in the ball milling process, the modifier can be uniformly and fully dispersed on the surface of the silicon carbide micro powder, the modifier and the silicon carbide micro powder are combined through molecular force through mechanical force, the stability of the modified silicon carbide is improved, and the modifier has good dispersion effect and good fluidity, and is suitable for slip casting and sintering; the carbon fibers and lanthanum oxide are added, so that the strength of silicon carbide is improved, and the toughness of the material is improved.

Description

technical field [0001] The invention relates to the field of materials, in particular to a modified silicon carbide and a preparation method thereof. Background technique [0002] Silicon carbide ceramics have excellent characteristics such as high temperature strength, strong oxidation resistance, good wear resistance, good thermal stability, small thermal expansion coefficient, high thermal conductivity, high hardness and chemical corrosion resistance. Therefore, it has shown its talents in many fields and has been paid more and more attention by people. For silicon carbide ceramics, the preparation of uniform and stable dispersed powder is the key to successful sintering. However, due to the small particle size and high surface energy of silicon carbide powder, it is easy to cause agglomeration and form secondary particles, which makes it difficult to exert the advantages of ultrafine powder, and ultimately affects the excellent performance of the finished product. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/626
CPCC04B35/565C04B35/62605C04B35/6261C04B2235/3217C04B2235/3227C04B2235/5248
Inventor 刘骏
Owner 湖南太子新材料科技有限公司
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