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

Rangaraj, L and Divakar, C and Vikram, Jayaram (2010) Fabrication and mechanisms of densification of ZrB2-based ultra high temperature ceramics by reactive hot pressing. Journal of the European Ceramic Society, 30 (1). pp. 129-138. ISSN 0955-2219

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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 40MPa, 1600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C. Hot Pressing of non-stoichiometric mixture of Zr, B4C and Si at 40MPa, 1600 C for 30 min resulted in ZrB2–ZrCx–SiC (15 vol%) composites of 98% RD

Item Type:	Journal Article
Uncontrolled Keywords:	Ceramic Composites, Borides, Densification
Subjects:	CHEMISTRY AND MATERIALS > Composite Materials
Division/Department:	Materials Science Division, Materials Science Division, Other
Depositing User:	Ms Indrani V
Date Deposited:	18 May 2012 16:42
Last Modified:	03 Aug 2012 16:26
URI:	http://nal-ir.nal.res.in/id/eprint/10454

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