Preparation of ZrB2-SiC composites by arc melting and their properties

Hong Tu, Hideroni Hirayama, Takashi Goto

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

ZrB2-SiC composites were prepared by arc melting using ZrB 2 and β-SiC powders as raw materials and their Viekers microhardness, electrical conductivity and thermal conductivity were investigated. The eutectic composition of the ZrB2-SiC system was ZrB2-58.5 mol%SiC with a labyrinthine microstrueture 100 nm in width and several /im in length. The hardness of the ZrB2-SiC composites increased with increasing SiC content and showed the highest value of 24 GPa at an indenter load of 4.9 N around the euteetic composition. The ZrB2-SiC euteetic composite had the highest fracture hardness of 6 MPa m1/2. The electrical conductivity of ZrB2-SiC composites ranged from 3.2 × 104 to 5.0 × 106×106 S m1 at room temperature and decreased with increasing temperature. Their thermal conductivity at room temperature was 70 to 95Wm-1 K-1 and decreased with increasing temperature. The eutectic composite had the lowest thermal conductivity.

Original languageEnglish
Pages (from-to)431-435
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume116
Issue number1351
DOIs
Publication statusPublished - 2008 Mar

Keywords

  • Arc melting
  • Electrical conductivity
  • Eutectic composite
  • Fracture toughness
  • Hardness
  • Thermal conductivity

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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