Aluminum titanate-tetragonal zirconia composite with low thermal expansion and high strength simultaneously

✍ Scribed by Tadashi Shimada; Masatoshi Mizuno; Kouji Katou; Yukio Nurishi; Minoru Hashiba; Osamu Sakurada; Daisuke Mizuno; Teruaki Ono

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 541 KB
• Volume: 101-103
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(97)00301-9

✦ Synopsis

Aluminium titanate was strengthened by alloying with 3 mol% yttria stabilized zirconia to attain a small expansion coefficient of 2 X 10m6 and a high strength of 100 MPa, simultaneously. Long milling and optimization of the composition of the alloy to an equal weight of the component oxides and also of the firing temperature at 1400°C were important for the purpose. In the optimal conditions, aluminum titanate grains of 3 pm was surrounded by zirconia matrix of ca. 0.3 km grains containing zirconium titanate where would be a balance between the tension in the matrix and the expansion force of aluminum titanate grains. Formation of zirconium titanate was important for the strengthening to decrease the lowering of the strength brought about by the unstabilization of PSZ.