掺杂Al_2O_3的CeO_2材料显微形貌观察

SEM Observation of Ceria-based Electrolyte Doped with Al_2O_3

对掺杂Al2O3的CeO2基固体电解质材料表面及断口形貌进行了扫描电子显微镜观察。实验发现，Al2O3可以起到有效的强化晶界作用，使断裂形式由沿晶断裂变为穿晶断裂为主。分析认为，Al2O3的强化作用是由于两方面的因素造成的：首先是掺杂Al2O3会导致压缩性应力，其次是晶界处的Al2O3使微裂纹偏转。

The surface and fracture morphologies of CeO2-based electrolyte materials doped withAl2O3 were observed with SEM. It was foun that Al2O3 could toughen the grain bodew of CeO2-basedelectrolyte,and cause fracture transgranular instead of intercrystalline. The reason was that doping Al2O3could bring on compressive stress and prevent the micro-crack from propagation. On the other hand, Al2O3distributed in the grain boundary and caused the crack deflection.