Fracture surface energy and microstructure of silicon carbides with different additives

Hiromoto Kitahara, Fuyuki Yoshida, Hideharu Nakashima, Nobuhiro Shinohara, Hiroshi Abe

Research output: Contribution to journalArticlepeer-review

Abstract

This study was carried out to clarify the relationship between microstructures and mechanical properties of SiC sintered with Al2O3 additive (1960°C for 2 h and 1980°C for 4 h) and with B and C additives. Fracture surface energy, γi, for crack initiation and work of fracture surface energy, γwof, for crack propagation were selected as suitable parameters for screening the mechanical properties. γi was measured by both indentation fracture (IF) and Chevron notch three-point bend methods. The Chevron notch method was also performed to measure γwof. γi measured by the IF method depended on the applied load and the relationship between the load and γi differed among specimens with different microstructures. It was found that the γi measured at a high load is about the same as that measured by the Chevron notch method for all the specimens. Both γi and γwof of SiC sintered with Al2O3 additive were higher than those of SiC sintered with B and C additives. γi and γwof of SiC sintered with B and C were about the same, while γwof of SiC sintered with Al2O3 additive was higher than γi. Sintering aids, grain size and morphology affected the crack propagation behavior.

Original languageEnglish
Pages (from-to)818-822
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume110
Issue number1285
DOIs
Publication statusPublished - Jan 1 2002

All Science Journal Classification (ASJC) codes

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

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