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
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[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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