Thermal Shock Resistance of ZrO_2 Fiber/Al_2O_3 Ceramics

摘要

The physical and mechanical properties of alumina (Al_2O_3) ceramics by introduction of zirconia (ZrO_2) fiber were studied. ZrO_2/Al_2O_3 ceramics at different sintering temperature was investigated by porosity and water absorption measurements, flexual strength and thermal shock resistance analysis. Results showed that Al_2O_3 ceramics containing 15 wt% ZrO_2 fiber with sintering temperature of 1650°C exhibited good mechanical properties and thermal shock resistance. The porosity and water absorption were 7.4% and 0.69%, respectively. The flexual strength was 613 MPa and the thermal shock times reached 29 times. Scanning electron microscope (SEM) was used to analyze the microstructure of Al_2O_3 ceramics.