ZHOU Jianer, JIANG Weihui, MA Guanghua , GU Xingyong

(Jingdezhen Ceramic Institute)

Abstract: The function and mechanism of compound additives suppressing the thermal decomposition of β-Al₂TiO₅ has been investigated in.detail by means of X diffraction analysis, dilatometry, TEM and EPMA. It has been indicated that compound additives are more effective than single additives in regard to suppressing the thermal decomposition of β-Al₂TiO₅. Compound additives not only improve the thermal stability of β-Al₂TiO₅, but also preserve its excellent property of low expansion. The mechanism of compound additives suppressing the thermal decord position of β-Al₂TiO₅is that on the one hand, Compound additives can form the compounds which not only have-the same crystal structure β-Al₂TiO₅，but also can form complete substitutional solid solutions with β-Al₂TiO₅. On the other hand, ferric oxide can activate crystal lattice and enable other cations in compound additives to have more solubility. Consequently, the stability of β-Al₂TiO₅ has been greatly improved.

Keywords: aluminum titanate, compound additive, thermal decomposition, thermal stability