Control of microstructure of alumina ceramics by dispersion of nano SiC particulates

Byungkoog Jang, Manabu Enoki, Teruo Kishi

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9 Citations (Scopus)


Al2O3/SiC composites were prepared by hot-pressing in order to investigate the microstructural characteristics and nano-disperse behavior of alumina matrix composites. The grain size of the monolithic alumina ceramics increased with increasing hot-pressing temperature, and the exaggerated grain growth occurred above 1800 °C. However, the addition of SiC particulates effectively suppressed the growth of the alumina matrix in the composites. The average matrix grain size was smaller and the grain size distribution was narrower than those of the monolithic alumina ceramics. Very fine SiC particulates were well dispersed in composites as nano-sized intragranular grains in the alumina matrix, on the other hand, coarse SiC particulates were found to exist at grain boundaries of the alumina matrix. The intragranular SiC seems to be trapped like a pores in the matrix grains during the densification by hot-pressing. It is concluded that nano-sized SiC particulates are grain growth inhibitors and microstructural stabilizers thus giving a uniform microstructures with fine grains.

Original languageEnglish
Pages (from-to)863-867
Number of pages5
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Publication statusPublished - 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry


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