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Research Article | Open Access

ZrB2-SiC based composites for thermal protection by reaction sintering of ZrO2+B4C+Si

R. V. KRISHNARAO( ), V. V. BHANUPRASAD, G. MADHUSUDHAN REDDY
Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad-500058, India
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Abstract

Synthesis and sintering of ZrB2-SiC based composites have been carried out in a single-step pressureless reaction sintering (PLRS) of ZrO2, B4C, and Si. Y2O3 and Al2O3 were used as sintering additives. The effect of ratios of ZrO2/B4C, ZrO2/Si, and sintering additives (Y2O3 and Al2O3), was studied by sintering at different temperatures between 1500 and 1680 ℃ in argon atmosphere. ZrB2, SiC, and YAG phases were identified in the sintered compacts. Density as high as 4.2 g/cm3, micro hardness of 12.7 GPa, and flexural strength of 117.6 MPa were obtained for PLRS composites. Filler material was also prepared by PLRS for tungsten inert gas (TIG) welding of the ZrB2-SiC based composites. The shear strength of the weld was 63.5 MPa. The PLRS ZrB2-SiC composites exhibited: (i) resistance to oxidation and thermal shock upon exposure to plasma flame at 2700 ℃ for 600 s, (ii) thermal protection for Cf-SiC composites upon exposure to oxy-propane flame at 2300 ℃ for 600 s.

Keywords

ZrB2SiCreactive sinteringsynthesiscomposites

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Journal of Advanced Ceramics
Volume 6 Issue 4,
December 2017
Pages 320-329
DOI: 10.1007/s40145-017-0244-2
Cite this article:
KRISHNARAO RV, BHANUPRASAD VV, REDDY GM. ZrB2-SiC based composites for thermal protection by reaction sintering of ZrO2+B4C+Si. Journal of Advanced Ceramics, 2017, 6(4): 320-329. https://doi.org/10.1007/s40145-017-0244-2

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Received: 20 June 2017
Revised: 23 August 2017
Accepted: 30 August 2017
Published: 19 December 2017
© The author(s) 2017

Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons. org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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