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

R. V. KRISHNARAO; V. V. BHANUPRASAD; G. MADHUSUDHAN REDDY

doi:10.1007/s40145-017-0244-2

Journal of Advanced Ceramics 2017, 6(4): 320-329 https://doi.org/10.1007/s40145-017-0244-2

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Open Access | Issue | Published: 19 December 2017

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

Show Author's Information Hide Author's Information R. V. KRISHNARAO(

), V. V. BHANUPRASAD, G. MADHUSUDHAN REDDY

Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad-500058, India

Keywords:

composites, synthesis, reactive sintering, SiC, ZrB₂

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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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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.

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

Show Author's information Hide Author's Information R. V. KRISHNARAO(

), V. V. BHANUPRASAD, G. MADHUSUDHAN REDDY

Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad-500058, India

Abstract

Keywords: composites, synthesis, reactive sintering, SiC, ZrB₂

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Acknowledgements

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Publication history

Received: 20 June 2017

Revised: 23 August 2017

Accepted: 30 August 2017

Published: 19 December 2017

Issue date: December 2017

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Acknowledgements

Authors acknowledge the financial support from the Defence Research and Development Organization, Ministry of Defence, Government of India, New Delhi, India, in order to carry out the present study under project DMR-295. They are grateful to the Director of DMRL, Hyderabad, for his constant encouragement. The authors acknowledge the support from various characterization groups of DMRL.

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