Effect of SiCp Addition on Microstructure and Mechanical Properties of ZTA Ceramics by Microwave Sintering

摘要

The effects of SiC_p addition on the microstructure and mechanical properties of ZTA ceramics was investigated by microwave sintering. Partially stabilized zirconia (3Y-ZrO_2) nanopowder containing SiC_p was prepared by microwave pyrolysing precursor which was was achieved by co-precipitation method. The powders of alumina, yttria partially stabilized zirconia containing SiC_p were mixed to prepare ZTA ceramics green body by die pressing and cold isostatic pressing and subsequently sintered at the range of 1350 °C-1550 °C for 30 min by microwave. Microstructure showed that the grain of ZTA ceramics had directional growth by microwave sintering. SiC_p firstly absorbed microwave that made more uniform sintering of ZTA ceramics and caused local oriented growth of zirconia and alumina. Thus, the bending strength of ZTA ceramics was higher than ZTA without SiC_p. The ladder type heating mode of microwave sintering ZTA ceramics reduced relatively sintering time by 20 min due to the addition of SiC_p.