【摘要】 以Ce ZrO2为基体,通过复合不同加入量的第二相CePO4颗粒,研究了陶瓷材料力学性能的变化,并借助加载能谱仪(EDS)的扫描电子显微镜(SEM)对材料弯曲断口及压痕裂纹扩展方式进行分析。当CePO4加入量为25%时,虽然材料力学性能有一定下降,但已经能用WC刀具进行加工。材料的弯曲断口显示,CePO4在两相体系中的断裂呈层片状形式;加入CePO4后,由于两相之间弱结合界面的存在,压痕裂纹扩展形式发生明显变化,由连续扩展机制过渡为不连续扩展。由这两种机制形成的材料断裂过程是阶段性的,在实际中可以用作材料最终破坏前的预报。更多还原

【Abstract】 By adding different amount of CePO4 into CeZrO2, twophase composites CePO4/CeZrO2 were fabricated to investigate the changes of mechanical properties. The crosssection and the propagation mechanism of indentation cracks were also analyzed with the aids of SEM and EDS. When CePO4 content reaches 25%, the CePO4/CeZrO2 ceramic can be machined by WC tools although the mechanical properties decreased to some extent. It was also found that multilayered fracture occurres within CePO4 granules in crosssection of the twophase composites. After adding CePO4, the propagation mechanism of indentation cracks changes obviously and took the discontinuous form instead of the continuous one due to the existence of weak interfaces between CePO4 and CeZrO2. Based on the above two important mechanisms, the fracture process of the CePO4/CeZrO2 is gradual, which can be used as a forecast before the failure of the material in practical use.更多还原