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Research Article | Open Access

Thermite assisted synthesis of ZrB2 and ZrB2-SiC through B4C reduction of ZrO2 and ZrSiO4 in air

R. V. KRISHNARAOa( ), R. SANKARASUBRAMANIANa
Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad-500058, India
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Abstract

ZrB2 and ZrB2-SiC powders have been produced by reducing ZrO2 and ZrSiO4 with B4C without using any furnace. Magnesium was added to the mixtures of (ZrO2+B4C) and (ZrSiO4+B4C). The reaction has been assisted by a floral thermite packed around the compacts. By introducing elemental Si into (ZrO2+B4C) mixture, composite powders of ZrB2-SiC formed. After leaching out MgO with suitable HCl water solution, the product was analysed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effect of Si, B4C, and Mg on the extent of formation of ZrB2, ZrB2-SiC, and other phases has been studied. Formation of nano-sized ZrB2 and ZrB2-SiC composite powders was identified. The adaptability of the process for bulk production was examined.

Keywords

compositessynthesisZrB2ZrO2zircon (ZrSiO4)

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Journal of Advanced Ceramics
Volume 6 Issue 2,
June 2017
Pages 139-148
DOI: 10.1007/s40145-017-0226-4
Cite this article:
KRISHNARAO RV, SANKARASUBRAMANIAN R. Thermite assisted synthesis of ZrB2 and ZrB2-SiC through B4C reduction of ZrO2 and ZrSiO4 in air. Journal of Advanced Ceramics, 2017, 6(2): 139-148. https://doi.org/10.1007/s40145-017-0226-4

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Received: 20 January 2017
Revised: 03 March 2017
Accepted: 21 March 2017
Published: 16 June 2017
© The author(s) 2017

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