ZHOU Jianer, ZHANG Yuzhi, MA Guanhua, GU Xingyou

（Jingdezhen Ceramic Institute‚Shanghai Institute of Ceramic‚Chinese Academy Science）

Abstract: By SEM‚XRD and EDS and son．Methods‚the stabilizing effect of mullite on aluminum titanate has been studied in detail by means of analysing the microstructure‚compositions of grain boundary and crystal phase．It has been found that the effect machenism of mullite on stability of aluminum titanate is．（1） Si4＋ inter the lattice or its interstitial position of aluminum titanate at high temperature to form solid solution crystal and stabilizing the lattice．（2）The difference of thermal expansion between mullite and aluminum titanate‚the larger pressure （37．65MPa） has been formed that solidsolutional aluminum titanate to become more stable． 

Key words: mullite‚aluminum titanate‚thermal decomposition‚stabilize