Boron carbide preparing method

Abstract

The invention provides a boron carbide preparing method. The boron carbide preparing method comprises mixing boron materials and carbon materials into solid materials in a protective atmosphere, thenfeeding the solid materials into a direct-heat type rotary kiln or a direct-heat type shaft kiln; in the direct-heat type rotary kiln or the direct-heat type shaft kiln, the boron materials are sequentially preheated, heated, cooled and discharged to prepare boron carbide; in a heating section, power electrodes are applied to directly electrifying the carbon materials in the heating section and / ormaterials converted during heating, and the materials are heated through resistance of the materials in the heating section or contact resistance between the particles or blocks of the materials, andthe maximum temperature of the materials passing through the direct-heat type rotary kiln or the direct-heat type shaft kiln is not lower than 1250 DEG C. The boron carbide preparing method has the advantages of being high in thermal efficiency, low in power consumption, good in product consistency, stable in process, low in volatilization loss of the boron material and high in productivity.

Description

technical field [0001] The invention belongs to the technical field of boron materials and relates to a preparation method of boron carbide. Background technique [0002] Boron carbide has high hardness, self-lubrication, wear resistance, high temperature resistance, and super neutron absorption capacity. It is widely used in bulletproof and explosion-proof, radiation-resistant materials and radiation-proof materials. It has an irreplaceable role in aviation, military, and nuclear power industries. It is also widely used in civilian industries, such as yarn nozzles, bearing materials, etc. [0003] Boron carbide generally uses boric acid, borax or boric anhydride as raw materials, mixed with carbon raw materials in an electric arc furnace, and heated to above 2100°C for production. Boric anhydride or boric acid starts to melt and volatilize at close to 500°C, and reacts with carbon above 1200°C to form diboron dioxide, which is also volatile. Thermodynamic calculations sho...

AI Technical Summary

Problems solved by technology

Although the process has low energy consumption and high product purity, the price of raw materials is high and the process is not suitable for large-scale production

[0008] In summary, the existing boron carbide production process has problems such as unstable product quality, long production process, low heat transfer efficiency, volatile boron raw materials, serious pollution, low boron yield, and high energy consumption.