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Method for preparing boron carbide powder by dilution self-propagating method

A boron carbide powder, self-propagating technology, used in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the constraints on the production and application of boron carbide powder, high impurity content of boron carbide powder, and low purity of boron carbide powder. and other problems, to achieve the effect of low oxygen content, narrow particle size distribution, reduction of production energy consumption and production cost

Pending Publication Date: 2022-08-09
ZIBO SHENGTAI COMPOSITE MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only seriously pollutes the environment during the production process, but also produces boron carbide powder with low purity and uneven particle size, which requires secondary crushing process
This not only results in high impurity content and poor quality of boron carbide powder, but also causes high production cost, which seriously restricts the production and application of boron carbide powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The reaction dilution self-propagating method in this example prepares boron carbide powder, and the specific preparation process is as follows:

[0028] 1) Add glucose, boron oxide and calcium powder into the mixing tank according to the mass ratio of 1:7.5:15, add mixing balls with a material-to-ball ratio of 1:6, carry out three gas replacements after sealing, control the mixing time at 1h, and mix After homogeneous, the mixed raw materials are obtained;

[0029] 2) Disperse the mixed raw materials into the self-propagating reactor, and the pushed bulk density of the mixed raw materials is 0.28g / cm 3 ; Before ignition, argon gas replacement was carried out three times. When the pressure gauge showed 0, the self-propagating reaction was initiated by heating the mixture material with an electric heating wire in the self-propagating reaction furnace by the local ignition method, and the circuit was turned on. After the reaction stops cooling, the boron carbide crude pr...

Embodiment 2

[0033] The reaction dilution self-propagating method in this example prepares boron carbide powder, and the specific preparation process is as follows:

[0034] 1) Add glucose, boron oxide and calcium powder into the mixing tank according to the mass ratio of 1:7:15, add mixing balls with a material-to-ball ratio of 1:6, carry out three gas replacements after sealing, control the mixing time at 2h, and mix After homogeneous, the mixed raw materials are obtained;

[0035] 2) Disperse the mixed raw materials into the self-propagating reactor, and the pushed bulk density of the mixed raw materials is 0.25g / cm 3 ; Before ignition, first perform argon replacement three times, when the pressure gauge shows 0, use the local ignition method to heat the 1.5% mixture in the self-propagating reaction furnace with electric heating wire to initiate the self-propagating reaction, turn on the circuit to ignite, wait for After the reaction stops cooling, the boron carbide crude product is ob...

Embodiment 3

[0039] The reaction dilution self-propagating method in this example prepares boron carbide powder, and the specific preparation process is as follows:

[0040] 1) Add glucose, boron oxide and calcium powder into the mixing tank according to the mass ratio of 1:8:15, add mixing balls with a material-to-ball ratio of 1:6, and perform three gas replacements after sealing, and the mixing time is controlled at 1.5h, After mixing evenly, the mixed raw materials are obtained;

[0041] 2) Disperse the mixed raw materials into the self-propagating reactor, and the pushed bulk density of the mixed raw materials is 0.3 g / cm 3 ; Before ignition, argon gas replacement was carried out three times. When the pressure gauge showed 0, the self-propagating reaction was initiated by heating the 3.5% mixture with electric heating wire in the self-propagating reaction furnace by the local ignition method, and the circuit was turned on for ignition. After the reaction stops cooling, the boron carb...

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Abstract

The invention discloses a method for preparing boron carbide powder through a dilution self-propagating method, and belongs to the technical field of ceramic materials. The method is characterized by comprising the following process steps: 1) uniformly mixing glucose, boric oxide and calcium powder in a mass ratio of 1: (7-9): (14-17) to obtain a mixed raw material; 2) dispersing the mixed raw material, loading the dispersed mixed raw material into a self-propagating reaction furnace, initiating a self-propagating reaction by adopting a local ignition method under the protection of argon, and preparing a boron carbide crude product by adopting a dilution self-propagating method; and 3) carrying out acid leaching, washing and drying on the boron carbide crude product to obtain boron carbide powder. According to the method, the severity of the self-propagating reaction is controlled by adjusting the ratio of reactants, and the temperature of the whole reaction system and the purity and particle size of the product are controlled. The method is short in technological process and low in production cost. The boron carbide powder prepared by the method has the characteristics of high purity, narrow particle size distribution, small particle size and the like.

Description

technical field [0001] A method for preparing boron carbide powder by a dilution self-propagating method belongs to the technical field of ceramic materials. Background technique [0002] Boron carbide has high melting point, high hardness, low density, strong wear resistance, stable chemical properties, strong corrosion resistance and good neutron absorption capacity, and is widely used in special ceramics, refractory materials, radiation protection materials, aerospace and nuclear industry, etc. [0003] At present, boron carbide powder preparation methods include carbothermic reduction method, laser chemical vapor reaction method, direct chemical synthesis method, mechanical alloying method, etc. Among them, the carbothermic reduction method is mainly used to prepare boron carbide in industrial production. This method mainly utilizes the reducibility of carbon at high temperature, mixes boron source with carbon powder, and reacts at high temperature to produce boron carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/991
CPCC01B32/991C01P2006/80C01P2004/62Y02E30/30
Inventor 傅迪王朝王黎明石丽丽张健傅禄
Owner ZIBO SHENGTAI COMPOSITE MATERIAL TECH
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