Aluminum titanate-calcium dialuminate composites with low thermal expansion and high strength

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• 作者：Genfa Zhao ; Yang Bai ; ^{baiy@mater.ustb.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Lijie Qiao
• 关键词：Ceramic composites ; Aluminum titanate ; Sintering ; Calcium dialuminate ; Diesel particulate filters
• 刊名：Journal of Alloys and Compounds
• 出版年：2016
• 出版时间：25 January 2016
• 年：2016
• 卷：656
• 期：Complete
• 页码：1-4
• 全文大小：1018 K

文摘

Aluminum titanate (Al₂TiO₅, AT) has many advantages, such as high melting point, low thermal expansion and low thermal conductivity, but its industrial applications are hindered by phase decomposition at high temperature and low mechanical strength. This paper reports the properties of calcium dialuminate (CaAl₄O₇, CA₂) reinforced AT matrix composites. With the aid of Fe and Mg doping, the phase decomposition of AT is prevented. The three point bending strength of the composites is enhanced remarkably with increasing CA₂ content. After sintering at 1400 °C, the AT-40wt%CA₂ sample had a bending strength of 35 MPa about two orders of magnitude higher than that of the pure AT sample (∼0.3 MPa). The well sintered AT-CA₂ composites also exhibit low thermal expansion coefficient, especially for the 1400 °C sintered AT-20wt%CA₂ sample (0.23 × 10⁻⁶/°C). The AT-CA₂ composite with high mechanical strength and low thermal expansion is promising candidate in high temperature applications.