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 language | English |
|---|---|
| Pages (from-to) | 739-743 |
| Number of pages | 5 |
| Journal | Journal of the Ceramic Society of Japan |
| Volume | 106 |
| Issue number | 8 |
| Publication status | Published - Jan 1 1998 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - Fabrication and microstructure of Al2O3 matrix composites by in-situ reaction in the Al2O3-La2O3 system
AU - Jang, Byungkoog
AU - Kishi, Teruo
PY - 1998/1/1
Y1 - 1998/1/1
N2 - 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.
AB - 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.
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M3 - Article
AN - SCOPUS:0032136679
VL - 106
SP - 739
EP - 743
JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
JF - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
SN - 1882-0743
IS - 8
ER -