Mechanical, electrical and thermal properties of ZrC-ZrB2-SiC ternary eutectic composites prepared by arc melting

Rong Tu, Bing Xiao, Song Zhang, Zhao Deng, Qizhong Li, Meijun Yang, Takashi Goto, Lianmeng Zhang, Hitoshi Ohmori

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

ZrC-ZrB2-SiC composites were prepared by arc-melting in Ar atmosphere using ZrC, ZrB2 and SiC as starting materials. The ternary eutectic composition of 20ZrC-30ZrB2-50SiC (mol%) was first identified. SiC about 7 μm in length and 500 nm in diameter, ZrC about 4 μm in length and 1 μm in diameter, in rod-like microstructure, were uniformly dispersed in ZrB2 matrix of eutectic composite. The eutectic temperature of ZrC-ZrB2-SiC composite was approximately 2550 K. The Vickers Hardness and fracture toughness of eutectic composite was 23 GPa and 6.2 MPa m1/2, respectively. The electrical conductivity decreased from 7.2 × 107 to 1.75 × 106 S m−1 with the temperature increasing from 287 to 800 K. The thermal conductivity decreased from 85 to 61 W K−1 m−1 with increasing temperature from 287 to 973 K.

Original languageEnglish
Pages (from-to)3759-3766
Number of pages8
JournalJournal of the European Ceramic Society
Volume38
Issue number11
DOIs
Publication statusPublished - 2018 Sep

Keywords

  • Arc-melting
  • Electrical conductivity
  • Hardness
  • Thermal conductivity
  • ZrC-ZrB-SiC composites

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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