Effects of Aluminum and Zirconia Contents on the Sintering of Reaction-Bonded Aluminum Oxide Ceramics

The reaction‐bonded aluminum oxide (RBAO) process is an attractive alternative to the conventional processing of Al2O3‐based ceramics. The most attractive features of the process are the high strengths, densities, and easy machinability of the green powder compacts, and the low shrinkage and high st...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2005-08, Vol.88 (8), p.2046-2052
Main Authors: Sheedy, Paul M., Caram, Hugo S., Chan, Helen M., Harmer, Martin P.
Format: Article
Language:English
Subjects:
Aluminum
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Ceramics
Chemical industry and chemicals
Chemical reactions
Exact sciences and technology
Miscellaneous
Sintering
Technical ceramics
Zirconium
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Summary:The reaction‐bonded aluminum oxide (RBAO) process is an attractive alternative to the conventional processing of Al2O3‐based ceramics. The most attractive features of the process are the high strengths, densities, and easy machinability of the green powder compacts, and the low shrinkage and high strengths of the sintered ceramics. These advantages result from the presence of aluminum in the green bodies and are enhanced further with increasing aluminum contents. However, it is apparent that ZrO2‐containing RBAO powders with higher aluminum contents (>45 vol%) are increasingly more difficult to densify, as the start of densification is delayed (shifted to higher temperatures) and the densification rates are decreased. Ultimately, this results in a decrease in the limiting density to which the RBAO ceramic may be sintered. In this study, the cooperative effects of ZrO2 and aluminum contents on the sintering of RBAO ceramics are discussed in terms of densification behavior and microstructural analysis.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2005.00393.x