Effect of Yttria and Yttrium-Aluminum Garnet on Densification and Grain Growth of Alumina At 1200°-1300°C

• Published in: Journal of the American Ceramic Society Vol. 87; no. 4; pp. 692 - 695
• Main Author: Cinibulk, Michael K.
• Format: Journal Article
• Language: English
• Published: Westerville, Ohio American Ceramics Society 01.04.2004; Blackwell
• Subjects: alumina; Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Cermets, ceramic and refractory composites; Chemical industry and chemicals; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Miscellaneous; Other materials; Physics; Specific materials; Technical ceramics; yttria; yttrium aluminum garnet; Ceramic matrix composite; Scanning electron microscopy; Densification; Grain growth; Aluminium Yttrium Oxides Mixed; Experimental study; Oxide ceramics; Composite material; Additive; Yttrium Oxides; Technical ceramics; Kinetics; Manufacturing; Garnet type compound; Microstructure; Alumina
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1551-2916.2004.00692.x

Densification and grain growth of alumina were studied with yttria or yttrium‐aluminum garnet (YAG) additives at the relatively low temperatures of 1200°–1300°C. Yttria doping was found to inhibit densification and grain growth of alumina at 1200°C and, depending on dopant level, had a lesser effect at 1300°C. At 1200°C, yttria inhibits densification more than it hinders grain growth. The rate of grain growth increases faster with temperature than the rate of densification. Alumina‐YAG particulate composites were difficult to sinter, yielding relative densities of only 65% and 72% after 100 h at 1200° and 1300°C, respectively. Pure YAG compacts exhibited essentially no densification for times up to 100 h at 1300°C.