Smelting method of boron carbide material

Abstract

The invention discloses a smelting method of a boron carbide material. Raw materials comprise a boron source material, a carbon source material and an additive material, wherein the additive materialis mainly used for adjusting the resistivity of a furnace charge and stabilizing the current. The smelting method has the advantages that: 1, the boron source and carbon source of the furnace charge are increased, the resistivity of the furnace charge is reduced, the furnace starting current can increase rapidly, the material heating speed is high, and the temperature is stable; 2, by virtue of the cooperation of pole core circle, voltage and current, the temperature uniformity of a crucible area in a furnace can be improved, and a stable environment can be provided for the growth of boron carbide crystals; 3, after the boron-carbon steam pressure increases, the Brownian movement is accelerated, and the polymerization of crystallized blocks can be improved; 4, the current supply amount isconstant, so that the reduction reaction in the furnace is consistent, and the compactness of the boron carbide crystallized blocks is consistent; and 5, by adjusting the raw materials, proportion, smelting parameters and operation parameters, the purity of the boron carbide crystallized blocks is improved, and the yield of the high-purity crystallized blocks is increased.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a boron carbide smelting method. Background technique [0002] According to the analysis of high-performance boron carbide indicators, the iron and silicon content indicators in the chemical composition are greatly reduced compared with normal crystal blocks, and the smelting is more difficult. The boron-carbon ratio index of high-performance boron carbide is 4.0±0.2, and the actual reaction of boron carbide in the electric arc furnace The carbon position is between 15%-22%, the carbon-boron ratio is between 3.5-6, and the carbon-boron ratio is controlled at 4.0±0.2. It is difficult to smelt, so there are two difficulties in high-performance boron carbide. [0003] The traditional smelting and production of boron carbide generally uses raw materials such as boric acid (or boron oxide), carbon powder (or electrolytic graphite), and is synthesized in an electric arc furna...

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Problems solved by technology

[0004] (1) The quality of raw materials is uneven, and raw materials from different origins and production processes have obvious differences in composition;

[0005] (2) The high temperature of the electric arc furnace and the poor uniformity of the temperature field will cause the volatilization loss of boron, thereby forming boron carbide with a low boron-to-carbon ratio;

[0016] (1) The chemical index and production stability of the high-purity boron carbide crystalline block as boron carbide powder raw material are difficult to reach;

[0017] (2) The superhard characteristics of boron carbide lead to serious wear of processing equipment, which makes it easy to introduce wear impurities into the material;

[0018] (3) Conventional crushing and grinding can only make the particle size reach about 3 μm, and the preparation of finer powder faces difficulties

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