Boron carbide preparing method

A boron carbide and raw material technology, applied in the field of boron materials, can solve the problems of unsuitability for large-scale production, unstable product quality, volatile boron raw materials, etc., to facilitate large-scale industrial production, uniform and stable product quality, and shortened reaction time. Effect

Pending Publication Date: 2019-03-01
冯良荣
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 pr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Mix 1.5 tons of boron anhydride and petroleum coke + graphite powder + asphalt mixture (control the molar ratio of boron and carbon at 4:7), mix it with a double-cone screw mixer, roll it with a wheel mill, and press it with a roller ball machine The balls are then added in batches to the direct-heating rotary kiln that directly energizes the material (the electric heating rotary kiln disclosed in Chinese patent CN103335513A is adopted). The direct-heating rotary kiln rotates continuously, and the positive and negative electrodes in the direct-heating rotary kiln are filled with solid raw materials, and a 4000A DC or AC current is passed between the positive and negative electrodes. The material sequentially passes through the heating section (that is, the preheating section), the high temperature section between the positive and negative electrodes of the rotary kiln (that is, the heating section), and the cooling section is discharged. After the material has been reac...

Embodiment 2

[0037] Mix 1.5 tons of boric anhydride and melamine+asphalt mixture with a double-cone screw mixer, roll it with a wheel mill, press the ball with a pair of roller ball presses to make raw materials, and then add in batches from the top to directly electrify the material Directly heated shaft kiln. The direct-heating vertical kiln furnace is 6m high and is in the shape of a vertical cylinder with an inner diameter of 60cm. The direct-heating vertical kiln furnace is filled with raw materials or the above-mentioned materials, and the raw materials are added in time to maintain the material level not lower than 20cm from the inlet. . The positive and negative poles of the power supply are set at a distance of 3m in the middle of the direct heating vertical kiln. The 3m length is the heating section, and the materials in this section are fed with DC or AC current. Set 3 air inlets on the furnace circumference at the upper part of the heating section 50cm away from the heating se...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C01B32/991
CPCC01B32/991
Inventor 甘亚冯良荣
Owner 冯良荣
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