Fabrication and mechanisms of densification of ZrB2-based ultra high temperature ceramics by reactive hot pressing

Rangaraj, Lingappa and Divakar, Canchi and Jayaram, Vikram (2010) Fabrication and mechanisms of densification of ZrB2-based ultra high temperature ceramics by reactive hot pressing. In: Journal of the European Ceramic Society, 30 (1). pp. 129-138.

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Abstract

Dense ZrB2-SiC (25-30 vol%) composites have been produced by reactive hot pressing using stoichiometric Zr, B4C, C and Si powder mixtures with and without Ni addition at 40 MPa, 1600 degrees C for 60 min. Nickel, a common additive to promote densification, is shown not to be essential; the presence of an ultra-fine microstructure containing a transient plastic ZrC phase is suggested to play a key role at low temperatures, while a transient liquid phase may be responsible at temperatures above 1350 degrees C. Hot Pressing of non-stoichiometric mixture of Zr, B4C and Si at 40 MPa, 1600 degrees C for 30 min resulted in ZrB2-ZrCx-SiC (15 vol%) composites of similar to 98% RD.

Item Type:	Journal Article
Publication:	Journal of the European Ceramic Society
Publisher:	Elsevier Science
Additional Information:	Copyright for this article belongs to Elsevier Science.
Keywords:	Reactive hot pressing; Composites; Borides; Carbides; Ultra high temperature ceramics; Densification
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	01 Dec 2009 05:57
Last Modified:	19 Sep 2010 05:52
URI:	http://eprints.iisc.ac.in/id/eprint/25007

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