A kind of high-purity ultrafine amorphous boron powder and preparation method thereof

Abstract

The invention belongs to the technical field of amorphous boron powder preparation, and in particular relates to a high-purity ultrafine amorphous boron powder and a preparation method thereof. The preparation method comprises: mixing a boron source and a reducing agent to obtain a mixture; and then heating in two steps method to make the mixture self-propagating reaction; then cooling and impurity removal; wherein, the process of the two-step heating method includes: under a protective atmosphere, the mixture is firstly preheated, kept warm, and then heated up for self-propagation reaction. Propagating reaction; the temperature of the preheating is lower than the temperature of the self-propagating reaction. The two-step heating method adopted in the present invention can make the liquid boron source and reducing agent more fully mixed through interdiffusion through preheating and heat preservation, the self-propagating reaction is more thorough, and the formation of impurity phases is significantly reduced. And in the preferred scheme of adding calcium chloride in the present invention, the purity of the prepared boron powder can be further improved, and at the same time, by controlling the cooling, the prepared boron powder has the characteristics of high purity, fine particle size, and large loose ratio.

Description

technical field [0001] The invention belongs to the technical field of preparation of amorphous boron powder, and in particular relates to a high-purity ultrafine amorphous boron powder and a preparation method thereof. Background technique [0002] Amorphous boron powder has high energy characteristics and is an important national strategic resource. It is mainly used in the fields of JG fuel, civil explosives and pyrotechnic product manufacturing, especially in rocket propellant fuel, propellant fuel, igniter and pyrotechnic products. A large number of applications in industrial products and other industries can greatly improve the energy level of my country's new fuels. In addition, this product can also be used as detonating agent for automobile airbags, high-temperature anti-oxidation coatings, synthetic boride raw materials, special alloy components, deoxidizers for oxygen-free copper smelting, steelmaking additives, welding aids and high-end ceramic sintering additives...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the defect of low purity of the amorphous boron powder prepared by the existing method and further improve the use effect of the amorphous boron powder, the invention provides a high-purity ultrafine amorphous boron powder and a preparation method thereof. Amorphous boron powder has the advantages of high purity, high porosity ratio and ultra-fine particle size

[0008] The inventors of the present invention found in the research process that the boron powder directly prepared by the self-propagating method has low purity, and at least there are problems in the following aspects: ① The reaction raw materials are mechanically mixed, and then subjected to high-temperature sintering reaction, and complete mixing cannot be achieved due to mechanical mixing The purpose of uniformity will lead to incomplete reaction, more impurities generated, and lower purity; ②The impurity removal stage of pickling and water washing generally adopts conventional pickling and water washing, and there are no other specific process control points to further improve the impurity removal effect. Less effective, resulting in less pure final product