Influence of uni and bi-modal SiC composition on mechanical properties and microstructure of reaction-bonded SiC ceramics

Byung Koog Jang, Se Young Kim, In Sub Han, Doo Won Seo, Kee Seog Hong, Sang Kuk Woo, Yoshio Sakka

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Influence of SiC composition with different particle size on mechanical properties and microstructure of reaction-bonded SiC have been investigated using infiltration process of liquid Si. SiC specimens were prepared by reaction-bonding sintering at 1620°C in vacuum using different SiCC composition. Reaction-bonded SiC specimens show dense with 3.03.05 gr/cm3 of density. SiC specimens with bi-modal SiC composition show a fine microstructure than those of uni-modal SiC composition. In addition, in the specimens with bi-modal SiC composition, the microstructure of the sample with use of fine SiC starting powders is finer rather than those of use of relatively coarse SiC starting powders. The flexural strength and fracture toughness of specimens with bi-modal SiC composition are higher than those of uni-modal SiC composition. The main fracture mode of specimens with a high strength is intergranular fracture.

Original languageEnglish
Pages (from-to)1028-1031
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume118
Issue number1383
DOIs
Publication statusPublished - Nov 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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