Influence of aluminum titanate formation on sintering of bimodal size-distributed alumina powder mixtures

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb02866.x· OSTI ID:474134

Taruta, Seiichi; Itou, Yousuke; Takusagawa, Nobuo ^[1]; Okada, Kiyoshi ^[2]; Otsuka, Nozomu ^[3]

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1. Shinshu Univ., Nagano (Japan)
2. Tokyo Inst. of Tech. (Japan)
3. Nishi Tokyo Univ., Yamanashi (Japan)

The sintering behavior of green compacts, in which coarse alumina particles formed a skeletal structure and fine alumina and/or fine titania particles filled the voids of the green compacts changed according to the titania content in the fine powder. The titania content of 33 mol% was the most effective for the densification. The volume expansion due to the aluminum titanate formation occurred in the voids of the skeletal structure, and the densification of the skeletal structure progressed more because the grain growth between the fine and coarse alumina particles did not proceed. As the titania content decreased, the densification did not progress more than that of the compact with 33 mol% titania content because the grain growth proceeded more. As the titania content increased, the expansion of the compacts was larger, and large grains were formed by the reaction between the titania and coarse alumina particles. Therefore, densification became difficult.

• Sponsoring Organization: USDOE
• OSTI ID: 474134
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 3 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
BULK DENSITY
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
GRAIN GROWTH
PARTICLE SIZE
POROSITY
SINTERING
TITANIUM OXIDES