a b 4 si and b 6 Si purification method

Abstract

a B 4 Si and B 6 The purification method of Si, it relates to material field, the present invention will solve B 4 Si and B 6 The Si purification process is complex and the purification purity is not high. From the perspective of economy and ease of implementation, the present invention proposes the following purification treatment process idea: that is, the powder is oxidized first, and part of the simple substances such as B and Si are converted into The corresponding oxides are then treated with concentrated KOH under heating conditions to convert the corresponding impurities into water-soluble substances, and the effect of purification is achieved through a series of treatments. The invention is applied to the field of powder material purification.

Description

technical field [0001] The invention relates to the field of materials, in particular to a B 4 Si and B 6 Si purification method. Background technique [0002] B 4 Si and B 6 Si is a special material with high thermal and chemical stability, and has important application value in electronics, aerospace and other fields. B 4 Si is usually prepared by high-purity B and Si by high-temperature solid-phase sintering under vacuum or argon protection. By controlling the ratio of reactants B and Si, the prepared B can be realized. 4 The yield and purity of Si are high, the impurity content is low, and a small amount of impurity components are mainly elemental Si and B and a very small amount of SiO 2 with B 2 O 3 oxides, etc. In addition, the purity of the material has a serious impact on its performance, so to ensure B 4 The excellent properties of Si are necessary for the prepared B 4 Si is further purified to remove the impurity phase. [0003] In order to prepare hig...

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Problems solved by technology

[0004] The above impurity removal methods still have obvious defects such as limited purity improvement, low recovery rate, environmental pollution, and complicated process.

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