熔盐镁热还原法合成ZrB<sub>2</sub>超细粉体<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.08.022

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Abstract Phase pure ZrB₂ ultrafine powders were prepared via molten-salt-mediated magnesiothermic reduction in NaCl-KCl salt-medium using zirconium dioxide and boron carbide as raw materials, and magnesium powders as reducing agent. The influences of firing temperature, molar ratio of B/Zr and dosage of Mg powders on the synthesis of ZrB₂ were discussed, respectively. In addition, the phase composition and microstructure of the as-prepared ZrB₂ powders were characterized. The results showed that ZrB₂ could be formed at a temperature as low as 1 173 K, and the optimum synthesis temperature was 1 473 K. ZrB₂ ultrafine powders with a crystalline size range of 30-300 nm can be synthesized under the condition of 1 473 K/3 h reaction, B/Zr molar ratio of 2.2, and excessive Mg amount of 50 wt%.

Key words： ZrB₂ ultrafine powder molten salt magnesiothermic reduction

Published: 25 April 2017 Online: 2018-05-02

CLC number:

TB35

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	Articles by authors
	TAN Cao
	DUAN Hongjuan
	WANG Junkai
	ZHANG Haijun
	LIU Jianghao

Cite this article:

TAN Cao,DUAN Hongjuan,WANG Junkai, et al. Preparation of ZrB₂ Ultrafine Powders via Molten-salt-mediated Magnesiothermic Reduction[J]. Materials Reports, 2017, 31(8): 109-112.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.08.022 OR https://www.mater-rep.com/EN/Y2017/V31/I8/109

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