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a b 4 si and b 6 Si purification method

A purification method and solution technology, applied in the field of materials, can solve problems such as complex process, limited purity improvement, and environmental pollution

Active Publication Date: 2022-06-28
HARBIN INST OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • a b <sub>4</sub> si and b <sub>6</sub> Si purification method
  • a b <sub>4</sub> si and b <sub>6</sub> Si purification method
  • a b <sub>4</sub> si and b <sub>6</sub> Si purification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] B 4 Si purification process:

[0058] 1. The medicines and reagents used in this example are shown in the following table:

[0059] Table 1 Table of experimental drugs and reagents

[0060]

[0061] 2. The instruments used are shown in Table 2:

[0062] Table 2 Experimental instrument table

[0063]

[0064] In addition, other materials used in the experiment are from chemical agencies, such as disposable plastic droppers, plastic graduated cylinders (500mL and 250mL), nitrile gloves, magnetic stirring bars, Buchner funnels, aqueous / organic microporous filtration Membrane, medium-speed / slow-speed quantitative analysis filter paper, sand core funnel, etc.; all preparation solutions and reactions are deionized water; polytetrafluoroethylene beakers (250mL and 500mL), stirring bars, from custom.

[0065] 3. B 4 Si process exploration experiment

[0066] 3.1 Separation by filtration

[0067] In order to purify the processed B 4 Si is effectively separated from...

Embodiment 2

[0139] B 6 Si purification process:

[0140] The instruments and equipment used in this example are the same as those in Example 1, and the purification process exploration is the same as that in Example 1.

[0141] 1. This embodiment B 6 Si experimental process:

[0142] Since this example found in the previous research that B 6 The reaction is relatively stable after adding hydrogen peroxide to the original Si powder, but after adding KOH, a large number of bubbles are generated in the system, mainly because the impurity components Si and B in the powder are less, and the hydrogen peroxide is excessive, and reacts with KOH to generate oxygen . Based on this, in this embodiment, an optimization process is performed (as shown in the optimized experimental process flow and sample diagram in FIG. 10 ), and factors are investigated to obtain the best process.

[0143] 1.1. Hydrogen peroxide dosage optimization (3mL, 5mL, 10mL, 15mL, 20mL, 25mL)

[0144] Considering that the...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/02
CPCC01B35/02C01P2002/72C01P2004/01
Inventor 李明伟孙宇雷董国华张庆猛钟业盛杨剑民陈均优史丽萍赫晓东张文治何飞
Owner HARBIN INST OF TECH