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.
Keywords: Aluminum titanate, high-temperature strength, low thermal expansion, stabilizers.
Current Nanoscience
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.
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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
DOI https://dx.doi.org/10.2174/1573413709666131109005012 |
Print ISSN 1573-4137 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6786 |
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