Preparation method of nano boron carbide powder

A nano-boron carbide and powder technology, applied in nanotechnology and other directions, can solve the problems of high purity requirements of reaction raw materials, large average particle size of original powder, increased crushing treatment process, etc., and achieves easy mass production and simplified post-processing process. , rich edge effect

Inactive Publication Date: 2016-10-12
深圳市鑫成炭素科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The traditional industrial preparation of boron carbide powder mostly adopts carbothermal reduction method or carbon magnesium reduction method, such as the preparation method of CN 101570438 B ultrafine boron carbide powder. This production method consumes a lot of energy, and the production efficiency is low, and the average particle size The diameter is rela

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  • Preparation method of nano boron carbide powder

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preparation example Construction

[0012] The method for preparing nano boron carbide powder involved in the present invention,

[0013] The carbon source and the boron source are evenly mixed according to the molar ratio of 0.1 to 10:1, and placed in a crucible;

[0014] Wherein the carbon source is graphene, and the boron source is one or more arbitrary mixtures of boron powder, boron oxide, boric acid or borate;

[0015] Under an inert protective atmosphere, heat with a heating rate of 1-16°C / min, carry out carbothermal reduction reaction at a temperature of 900-2500°C, keep the temperature for 0.3-6 hours, and cool down at a rate of 1-16°C / min, that is Nano boron carbide powder can be prepared.

[0016] The graphene described in the present invention is prepared by methods such as micromechanical exfoliation method, graphite oxide reduction method, epitaxial growth method, chemical vapor deposition method, and chemical synthesis method.

Embodiment 1

[0018] (1) Graphene obtained by the micromechanical exfoliation method is used as a carbon source, and the mixture of boron powder and boron oxide is a boron source, wherein the molar ratio of boron powder and boron oxide is 2:1, and the graphene and boron oxide used as a carbon source The mixture as the boron source is mixed uniformly according to the molar ratio of 0.1:1, and placed in the crucible;

[0019] (2) Under an Ar gas atmosphere, the heating rate is 10°C / min, and the carbothermal reduction reaction is carried out at a temperature of 1800°C, the constant temperature time is 0.3h, and the cooling rate is 5°C / min;

[0020] (3) After the reaction is finished, ultrafine nanometer boron carbide powder is obtained, and the particle size is 80-100 nm.

Embodiment 2

[0022] (1) Graphene obtained by the graphite oxide reduction method is used as a carbon source, and boron powder and boric acid are used as a boron source, wherein the mol ratio of boron powder and boric acid is 1:1, and the carbon source and silicon source are 0.25 according to the molar ratio: The ratio of 1 is mixed evenly and placed in a crucible;

[0023] (2) in N 2 Under air atmosphere, the heating rate is 1°C / min, and the carbothermal reduction reaction is carried out at 2500°C, the constant temperature time is 1.5h, and the cooling rate is 1°C / min;

[0024] (3) After the reaction is finished, ultrafine nanometer boron carbide powder is obtained, and the particle size is 50-80nm.

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Abstract

A method for preparing nano boron carbide powder, characterized in that: carbon source and boron source are uniformly mixed according to the molar ratio of 0.1 to 10:1, and placed in a crucible; wherein the carbon source is graphene, and the boron source is boron powder, One or more arbitrary mixtures of boron oxide, boric acid or borate; under an inert protective atmosphere, heating is carried out at a heating rate of 1-16°C/min, and the carbothermal reduction reaction is carried out at a temperature of 900-2500°C , The constant temperature time is 0.3~6h, and the cooling rate is 1~16°C/min. Compared with the prior art, the method involved in the present invention has the following characteristics and advantages: graphene is used as a carbon source, and the characteristics of high specific surface area and abundant edges of graphene are utilized to provide a large number of active sites for boron carbide nucleation, It is beneficial to fully contact the carbon source and the boron source, and the reaction is complete; the prepared product is B 4 C nano powder does not need secondary crushing in the later ceramic sintering process, which reduces production costs and improves ceramic performance; no additives are required, and the post-processing process is simplified.

Description

【Technical field】 [0001] The invention relates to a method for preparing ceramic superfine powder, in particular to a method for preparing nano boron carbide powder by a carbothermal reduction method. 【Background technique】 [0002] As a widely used ceramic material, boron carbide is one of the superhard artificial materials whose hardness is second only to diamond and cubic boron nitride. Its compressive strength and bending strength are superior to carbon silicon boron and silicon carbide, and its grinding efficiency and The grinding quality is second only to diamond, and it is widely used in grinding, grinding, drilling and polishing of various hard materials. Widely used in cutting tools, special corrosion-resistant materials, atomic reactor control, radome wave-transparent materials, tank bulletproof armor and other fields. The traditional industrial preparation of boron carbide powder mostly adopts carbothermal reduction method or carbon magnesium reduction method, su...

Claims

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Application Information

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IPC IPC(8): C01B31/36C04B35/563B82Y40/00
CPCC04B35/563C01P2004/03C01P2004/62C01P2004/64C04B2235/5445C04B2235/5454
Inventor 杨绿娟陈成猛刘卓陈圆媛苏方远孔庆强
Owner 深圳市鑫成炭素科技有限公司
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