Influence of TiO2?on Chemical Stability, High Temperature and Electrochemical Properties of Alumina Ceramics based on η-Al2O3

摘要

In this paper, the effect of titanium dioxide (TiO2) on the high temperature performance, chemical stability and electrochemical property of alumina ceramics prepared by nanoη-Al2O3 were analyzed. Different contents of TiO2 (0, 1.5, 2.5 and 3.5 wt%) were added into nanoη-Al2O3, and combined with PVA to prepare alumina ceramic samples. The samples were kept at three different sintering temperatures (1450 °C, 1550 °C and 1650 °C) for 2 h, and their properties were measured. The results reveal that the diffusion coefficient and sintering rate of alumina ceramics prepared by nano η-Al2O3 showed nonlinear growth as TiO2 content increased. The results show that the wear resistance, erosion resistance and chemical stability of alumina ceramics prepared by nano η-Al2O3 were very high when the sintering temperature and amount of TiO2 were 1650°C and 2.5wt%, respectively. The electrochemical property of prepared ceramics was studied by cyclic voltammetry measurements which indicated the enhancement of double-layer capacitive property due to the introducing TiO2 to Al2O3 network.