镁热自蔓延高温合成碳化硼粉体及其成分调控研究

doi:10.11896/cldb.21060212

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Abstract To address the defects of low purity and high free boron content in the preparation of boron carbide (B₄C) via Magnesiothermic-SHS method, this work investigated the formation rule and fugacity state of the impurity phase in the process of Magnesiothermic-SHS and the impurity phase removal rule via enhanced leaching, guided by thermodynamic equilibrium calculations. The results show that the ingredient ratio in SHS process is a fundamental factor affecting the phase composition of the SHS products. The content of B₄C and MgO phases in the SHS products gradually increases with the increase of Mg content, while the content of Mg₃B₂O₆ decreases. When the Mg content reaches the stoichiometric ratio and then increases, there is no obvious change in the phase content of the products. The MgO byproduct phase from the SHS products can be effectively removed by acid leaching, while the intensive removal of the Mg₃B₂O₆ impurity phase requires the closed enhanced acid leaching, which can enhance the purification effect. The Mg residue in the leached product decreases to 2.06% and the free boron content decreases to 3.61%. The B₄C product is agglomerated particles with an average particle size of 5.30 μm and a specific surface area of 13.36 m²·g^-1.

Key words： boron carbide self-propagation high-temperature synthesis (SHS) enhanced leaching free boron

Published: 25 August 2022 Online: 2022-08-29

CLC number:

TB321

Fund:National Natural Science Foundation of China (U1908225, U1702253) and Fundamental Research Funds for the Central Universities (N182515007, N170908001, N2025004).

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	SHI Hao
	DOU Zhihe
	MENG Yang
	ZHANG Ting'an

Cite this article:

SHI Hao,DOU Zhihe,MENG Yang, et al. Preparation and Composition Regulation of Boron Carbide Powder via Magnesiothermic-SHS[J]. Materials Reports, 2022, 36(16): 21060212-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21060212 OR http://www.mater-rep.com/EN/Y2022/V36/I16/21060212

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