材料科学
四方晶系
韧性
涂层
脆性
复合材料
陶瓷
位错
纳米复合材料
晶体结构
结晶学
化学
作者
Zhen Zhang,Weixing Qian,Shuang Wang,Yongnan Chen,Nan Wang,Qinyang Zhao,Hongzhan Li,Guangrui Gao,Yongqing Zhang,Haifei Zhan
标识
DOI:10.1016/j.ceramint.2024.01.105
摘要
Ionic crystal ceramics are known to be susceptible to brittle cracks along the intergranular due to the strong ionic bond forces. Accordingly, an outstanding toughened coating consisting of yttria-stabilized tetragonal zirconia (YSTZ) and MgO, with a reinforced heterointerface, has been successfully achieved through the plasma electrolytic oxidation process. The results demonstrate that the enhanced Zr/Y–O bond strength improves the interfacial strength of the ionic crystal, while the lattice distortion activates continuous dislocation pinning at the (101) YSTZ//(111) MgO semicoherent heterointerface effectively hinders crack propagation of the coating. With the YSTZ content approaching 65 %, the toughness (KIC) value surpasses that of PEO coating by 42 %. These findings not only elucidate the scientific foundation for the improved toughness of the YSTZ/MgO nanocoating but also provide valuable insights into design strategies for improving ceramic toughness.
科研通智能强力驱动
Strongly Powered by AbleSci AI