Thermal Shock-Resistance Performance of Al{sub}2TiO{sub}5/Al{sub}2O{sub}3 Composites

摘要

In the present paper, Al{sub}2TiO{sub}5-Al{sub}2O{sub}3 composites with 10, 20, 40, 60, 80, and 90Vol.% of Al{sub}2O{sub}3 respectively were prepared by the sintering of Al{sub}2TiO{sub}5 and Al{sub}2O{sub}3 powers. The thermal expansion ratio was measured and. the quenching-strength method was used to study the thermal shock-resistance performance. The thermal expansion ratio was found to increase from zero for the sample with 10-20Vol.%Al{sub}2O{sub}3 to that of 0.007% as the content of Al{sub}2O{sub}3 increased. The results of quenching-strength test showed that the residual strength of Al{sub}2TiO{sub}5-Al{sub}2O{sub}3 composites decreased with increasing of Al{sub}2O{sub}3 content and the thermal shock cycles. The Al{sub}2TiO{sub}5/Al{sub}2O{sub}3 composite with 20Vol.% Al{sub}2O{sub}3 remained a strength of 33.4MPa after three cycles and exhibited good thermal shock-resistance performance.