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Thermal shock behavior of rare earth modified alumina ceramic composites

Junlong Sun and Changxia Liu


Alumina matrix ceramic composites toughened by AlTiC master alloys, diopside and rare earths were fabricated by hot-pressing and their thermal shock behavior was investigated and compared with that of monolithic alumina. Results showed that the critical thermal shock temperature (ΔT) of monolithic alumina was 400 °C. However, it decreased to 300 °C for alumina incorporating only AlTiC master alloys, and increased with further addition of diopside and rare earths. Improvement of thermal shock resistance was obtained for alumina ceramic composites containing 9.5 wt.% AlTiC master alloys and 0.5 wt.% rare earth additions, which was mainly attributed to the formation of elongated grains in the composites.

*Correspondence address, Associate Professor Liu Changxia, School of Transportation, Ludong University, Yantai 264025, Shandong Province, P. R. China, Tel.: +86-15866472136, Fax: +86-0535-6681847, E-mail:


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Received: 2016-12-07
Accepted: 2017-02-01
Published Online: 2017-05-04
Published in Print: 2017-05-15

© 2017, Carl Hanser Verlag, München