Rangaraj, Lingappa and Chakrabarti, Tamoghna and Kannan, Rajaguru and Jayaram, Vikram (2016) Effect of applied pressure on densification of monolithic ZrCx ceramic by reactive hot pressing. In: JOURNAL OF MATERIALS RESEARCH, 31 (4). pp. 506-515.
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The effect of applied pressure on reactive hot pressing (RHP) of zirconium (Zr):graphite (C) in molar ratios of 1:0.5, 1:0.67, 1:0.8, and 1:1 was studied at 1200 degrees C for 60 min. The relative density achievable increased with increasing pressure and ranged from 99% at 4 MPa for ZrC0.5 to 93% for stoichiometric ZrC at 100 MPa. The diminishing influence of pressure on the final density with increasing stoichiometry is attributed to two causes: the decreasing initial volume fraction of the plastically deforming Zr metal which leads to the earlier formation of a contiguous, stress shielding carbide skeleton and the larger molar volume shrinkage during reaction which leads to pore formation in the final stages. A numerical model of the creep densification of a dynamically evolving microstructure predicts densities that are consistent with observations and confirm that the availability of a soft metal is primarily responsible for the achievement of such elevated densification during RHP. The ability to densify nonstoichiometric compositions like ZrC0.5 at pressures as low as 4 MPa offers an alternate route to fabricating dense nonstoichiometric carbides.
| Item Type: | Journal Article |
|---|---|
| Publication: | JOURNAL OF MATERIALS RESEARCH |
| Publisher: | CAMBRIDGE UNIV PRESS |
| Additional Information: | Copy right for this article belongs to the CAMBRIDGE UNIV PRESS, 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA |
| Keywords: | ceramic; densification; hot pressing |
| Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
| Date Deposited: | 07 Apr 2016 07:22 |
| Last Modified: | 07 Apr 2016 07:22 |
| URI: | http://eprints.iisc.ac.in/id/eprint/53623 |
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