为了研究ZrO_2陶瓷的冲击性能,分析其失效特征,从而改善ZrO_2陶瓷的脆性,使用高功率钕玻璃脉冲激光器对ZrO_2陶瓷进行了冲击试验.通过扫描电子显微技术,观察其断口形貌,发现陶瓷的失效主要是由层裂所引起的,层裂表面以典型的脆性断口为主,同时有较多的晶粒拔出现象,层裂面并不是沿单一平面扩展,而是形成大量的台阶,层裂方向和密度分布表明失效是由反射拉伸波造成的.同时材料表面层由于压应力而产生约几十μm的致密压缩层,压缩层内无层裂现象发生.由此机理表明在合适的激光能量下可形成表面强化而基体增韧的ZrO_2陶瓷材料.
For studying the impact performance of ZrO_2 ceramics and analyzing its failure characteristic,the brittleness of ZrO_2 ceramics.and improving the laser shock experimentation Was proceed using a high power Nd glass pulse laser machine The fracture microphology was characterized show that the failure of ceramics is primarily caused by delamination,the delamination surface is mainly comprised of typical brittle feature and many grains are pulled out on the fracture surface.The delamination layer does not expand along the single surface,but generates a lot of steps.From the direction of layer delamination and distribution of density,it can be illuminated that the fracture is caused by reflected tensile wave.Compression structure is generated in the material surface layer,and no layer delamination occurrs.It is showed that the ZrO_2 material with surface hardness enhanced and toughness of the basement increased Can be formed under the appropriate laser energy according to this mechanism.
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