Effect of Different Additives on the Thermal Expansion Coefficient of Aluminium Titanate
不同添加剂对钛酸铝热膨胀系数影响的研究

Aluminium titanate is an excellent inorganic non-metal material due to its high melting point and low expansion. In order to improve its strength and to suppress its thermal decomposition, additives are frequently introduced into it. In this paper, the effect of a single additive or compound additives on the thermal expansion coefficient of Al2TiO5 was investigated. The results show that the addition of some rare-earth oxide can greatly reduce the thermal expansion coefficient of Al2TiO5. For example, the addition of 1~4mol% CeO2 or 2mol% La2O3 makes its expansion coefficient come near zero. That gives a new approach in the development of materialswith no thermal expansion. It I s indicated that there is no change in the expansion coefficient of Al2TiO5 by adding 1~4mol% Fe2O3 in it. The addition of SiO2 in Al2TiO5 containing 4mol% Fe2O3 increases its expansion coefficient while the addition of another rare-earth oxide decreases the expansion coefficient. Proper batching of three additives can adjust the expansion coefficient of Al2TiO5 to minimum. The addition of the compound additives may be very significant for improving the properties of Al2TiO5.