Hardness and Microstructure of SiC-B4C Eutectic Ceramics Prepared by Arc Melting

Takashi Goto, Eiji Ito, Toshio Hirai

Research output: Contribution to journalArticlepeer-review

Abstract

Quasi binary SiC-B4C and ternary Si-B-C system composites were prepared by arc melting in argon atmosphere. The Vickers microhardness (100g load) of the quasi binary SiC-B4C composites decreased from 39 to 34 GPa with increasing SiC molar content (mSiC) from 25 to 65 mol%. The hardness values at mSiC=45 to 55 mol%, which is nearly the eutectic composition, was higher than those calculated from a linear law. This could be caused by fine lamella microstructures. Free C and free Si co-precipitated at the C-rich and Si-rich side of the quasi binary composition, respectively. The hardness values at the quasi binary compositions were greater than those of the C-rich and Si-rich compositions.

Original languageEnglish
Pages (from-to)469-473
Number of pages5
Journaljournal of the japan society of powder and powder metallurgy
Volume42
Issue number4
DOIs
Publication statusPublished - 1995 Jan 1

Keywords

  • SiC-BC system
  • Vickers microhardness
  • arc melting
  • eutectic reaction
  • microstructure

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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