Heat conduction mechanisms in hot pressed ZrB2 and ZrB2-SiC composites

Patel, Manish and Prasad, Bhanu VV and Jayaram, Vikram (2013) Heat conduction mechanisms in hot pressed ZrB2 and ZrB2-SiC composites. In: Journal of the European Ceramic Society, 33 (10). pp. 1615-1624.

PDF Jou_Eur_Cer_Soc_33-10_1615_2013.pdf - Published Version Restricted to Registered users only Download (805kB) | Request a copy

Abstract

Thermal diffusivity and conductivity of hot pressed ZrB2 with different amounts of B4C (0-5 wt%) and ZrB2-SiC composites (10-30 vol% SiC) were investigated experimentally over a wide range of temperature (25-1500 degrees C). Both thermal diffusivity and thermal conductivity were found to decrease with increase in temperature for all the hot pressed ZrB2 and ZrB2-SiC composites. At around 200 degrees C, thermal conductivity of ZrB2-SiC composites was found to be composition independent. Thermal conductivity of ZrB2-SiC composites was also correlated with theoretical predictions of the Maxwell Eucken relation. The dominated mechanisms of heat transport for all hot pressed ZrB2 and ZrB2-SiC composites at room temperature were confirmed by Wiedemann Franz analysis by using measured electrical conductivity of these materials at room temperature. It was found that electronic thermal conductivity dominated for all monolithic ZrB2 whereas the phonon contribution to thermal conductivity increased with SiC contents for ZrB2-SiC composites.

Item Type:	Journal Article
Publication:	Journal of the European Ceramic Society
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Composites; Thermal Conductivity; Electrical Conductivity; Borides
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	11 Jul 2013 05:45
Last Modified:	11 Jul 2013 05:45
URI:	http://eprints.iisc.ac.in/id/eprint/46774

Actions (login required)

View Item