Preparation of ZrB2 Ultrafine Powders via Molten-salt-mediated Magnesiothermic Reduction

被引：0

作者：

Tan C. ^{[1
]}

Duan H. ^{[1
]}

Wang J. ^{[1
]}

Zhang H. ^{[1
]}

Liu J. ^{[1
]}

机构：

[1] The State Key Laboratory of Refractories and Metallurgy, College of Material and Metallurgy, Wuhan University of Science and Technology, Wuhan

来源：

Cailiao Daobao/Materials Review | 2017年 / 31卷 / 04期

关键词：

Magnesiothermic reduction; Molten salt; Ultrafine powder; ZrB[!sub]2[!/sub;

D O I：

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

中图分类号：

学科分类号：

摘要：

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%. © 2017, Materials Review Magazine. All right reserved.

引用

页码：109 / 112

页数：3

共 12 条

[1] Zhang S., Khangkhamano M., Zhang H., Et al., Novel synthesis of ZrB2 powder via molten-salt-mediated magnesiothermic reduction, J Am Chem Soc, 97, 6, (2014)
[2] Wang X., Wang Z., Wang X., Et al., Synthesis of TiB2 nanopowder by magnesiothermic reduction in molten salt, J Chin Ceram Soc, 42, 6, (2014)
[3] Wang J., Du S., Et al., Boro/carbothermal reduction preparation and oxidation resistance of ZrB2-SiC composite powders, J Chin Ceram Soc, 43, 9, (2015)
[4] Karasev A.I., Preparation of technical zirconium diboride by the carbothermic reduction of mixtures of zirconium and boron oxides, Sov Powder Metall Met Ceram, 12, 11, (1973)
[5] Radev D.D., Klissurski D., Mechanochemical synthesis and SHS of diborides of titanium and zirconium, J Mater Synth Process, 9, 3, (2001)
[6] Yan Y., Huang Z., Dong S., Et al., New route to synthesize ultra-fine zirconium diboride powders using inorganic-organic hybrid precursors, J Am Chem Soc, 89, 11, (2006)
[7] Ran S., Sun H.F., Wei Y.N., Et al., Low-temperature synthesis of nanocrystalline NbB2 powders by borothermal reduction in molten salt, J Am Chem Soc, 97, 11, (2014)
[8] Huang Z., Et al., Preparation of CaZrO3 powders by a microwave-assisted molten salt method, J Ceram Soc Jpn, 124, 5, (2016)
[9] Ding J., Deng C., Yuan W., Et al., Novel synthesis and characterization of silicon carbide nanowires on graphite flakes, Ceram Int, 40, 3, (2014)
[10] Ye J., Zhang S., Lee W.E., Novel low temperature synthesis and cha-racterisation of hollow silicon carbide spheres, Microp Mesop Mater, 152, 4, (2012)

← 1 2 →