ZnO晶须与ZrO2对95氧化铝多孔陶瓷显微结构及性能的影响

Effects of ZnO Whisker and ZrO2 on Microstructures and Mechanical Properties of 95 Al2O3 Porous Ceramics

采用凝胶注模成型工艺制备固相含量10vol.%的95氧化铝多孔陶瓷。研究了添加ZnO晶须、ZrO2对95氧化铝多孔陶瓷的显微结构、气孔率、孔径分布及压缩强度的影响。结果显示,添加ZnO晶须对95氧化铝多孔陶瓷烧结体的密度及孔隙率没有显著的影响,但可提高其强度,压缩强度由11.7 MPa提高至18 MPa;而添加ZrO2会使95氧化铝多孔陶瓷气孔率急剧下降,密度提高,同时,也大幅度提高其压缩强度。制备出的添加20wt.%的10vol.%的95氧化铝多孔陶瓷压缩强度高于20.3 MPa。

ZnO whisker and ZrO2 were added into porous 95Al2O3 ceramics prepared by using gel-casting process to increase their compressive strength.Porosity of the ceramics added with ZnO whisker and ZrO2 was studied by using the Archimedes method.Pore size distribution was characterized by using mercury intrusion porosimetry.Compressive strength was measured by using compression test.Microstructure and phase composition were examined by using scanning electron microscopy(SEM)and X-ray diffractometer(XRD).It was found that the addition of ZnO whisker had almost no effect on density and porosity of the 95Al2O3 ceramics,but the compressive strength was increased from 11.7 MPa to 18.0 MPa.The presence of ZrO2 decreased the porosity and increased the compressive strength.The 10 vol.%sample with 20 wt.%ZrO2 possessed a compressive strength of 20.3 MPa.