Mechanical Properties of Al₂TiO₅ Ceramics for High Temperature Application

Title:Mechanical Properties of Al₂TiO₅ Ceramics for High Temperature Application

Volume: 10 Issue: 1

Author(s): Dami Kim, Hyeong-Jun Kim, Hyung-Tae Kim, Jung Namkung, Ikjin Kim, Sung-Churl Choi and Sung- Soo Ryu

Affiliation:

Keywords: Aluminum titanate, high-temperature strength, low thermal expansion, stabilizers.

Abstract: The present work investigated the effects of MgO as a thermodynamic stabilizer and ZrO₂ and mullite (3Al₂O₃·SiO₂) as kinetic stabilizers on the mechanical properties of Al₂TiO₅ at high temperatures. Al₂TiO₅ was synthesized using reaction sintering at 1500, 1550, and 1600°C for 2 h. The mix-stabilized Al₂TiO₅ sintered at 1500°C showed the highest mechanical strength (138 MPa) at 1100°C, while the mullite-only Al₂TiO₅ sintered at 1550°C showed a mechanical strength of only 67 MPa at 1200°C. The strength improvement achieved at high temperatures was affected by not only secondary phase mullite to inhibit grain growth of Al₂TiO₅ and to improve strength but thermodynamic stabilizer to promote synthesis Al₂TiO₅. The coefficient of thermal expansion of mix-stabilized Al₂TiO₅ decreased with increase of sintering temperature due to its microcrack, however, that of the mullite-only Al₂TiO₅ was not changed because of large number of pores.

Cite this article as:

Kim Dami, Kim Hyeong-Jun, Kim Hyung-Tae, Namkung Jung, Kim Ikjin, Choi Sung-Churl and Ryu Sung- Soo, Mechanical Properties of Al₂TiO₅ Ceramics for High Temperature Application, Current Nanoscience 2014; 10 (1) . https://dx.doi.org/10.2174/1573413709666131109005012