Fabrication and microstructure of Al2O3 matrix composites by in-situ reaction in the Al2O3-La2O3 system

Byungkoog Jang, Teruo Kishi

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Al2O3/aluminate composites were fabricated by a solid reaction in the La2O3-Al2O3 system. The formed phase showed elongated morphology that could be controlled by varying the hot-pressing temperature and time. Dense Al2O3/LaAl11O18 composites were fabricated by hot-pressing above 1500°C. When the hot-pressing temperature was 1400°C, Al2O3/LaAlO3 composites were formed from starting composition. The grain size of monolithic alumina ceramics increased with increasing hot-pressing temperature, and marked grain growth occurred above 1600°C. However, the elongated LaAl11O18 phase suppressed the growth of alumina grains in the Al2O3/LaAl11O18 composites. Small LaAl11O18 grains existed in the alumina grains as an intragranular phase, while needlelike grains with a large aspect ratio existed at Al2O3 grain boundaries. The amount of in-situ formed LaAl11O18 phase increased with increasing amount of La2O3, and the aspect ratio of LaAl11O18 grains increased with increasing hot-pressing time.

Original languageEnglish
Pages (from-to)739-743
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume106
Issue number8
Publication statusPublished - Jan 1 1998
Externally publishedYes

Fingerprint

Hot pressing
hot pressing
Aluminum Oxide
Fabrication
microstructure
Microstructure
fabrication
composite materials
Composite materials
matrices
Alumina
aluminum oxides
Aspect ratio
aspect ratio
Grain growth
Temperature
Grain boundaries
temperature
grain boundaries
grain size

All Science Journal Classification (ASJC) codes

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

Cite this

Fabrication and microstructure of Al2O3 matrix composites by in-situ reaction in the Al2O3-La2O3 system. / Jang, Byungkoog; Kishi, Teruo.

In: Journal of the Ceramic Society of Japan, Vol. 106, No. 8, 01.01.1998, p. 739-743.

Research output: Contribution to journalArticle

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