Wu Hao-Long, Li Haiyan, Cao Dake, Qiu Yan, Wan Detian, Bao Yiwang
China Building Material Test & Certification Group Co., Ltd., Beijing 100024, China.
State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China.
Materials (Basel). 2023 Sep 4;16(17):6071. doi: 10.3390/ma16176071.
In this study, the prestressed coating reinforcement method was employed to create kyanite-coated zirconia toughened alumina (ZTA) prestressed ceramics. Due to the mismatch of the coefficient of thermal expansion (CTE) between the coating and substrate, compressive residual stress was introduced in the coating. The effects of compressive residual stress on the mechanical properties of ZTA have been demonstrated. Results show that the flexural strength of the kyanite-coated ZTA ceramics improved by 40% at room temperature compared to ZTA ceramics. In addition, the temperature dependence of mechanical properties has also been discussed. And the results show that the reinforcement gradually diminished with increasing temperature and eventually disappeared at 1000 °C. The modulus of elasticity of the material also exhibits a decreasing trend. Furthermore, the introduction of the prestressing coating enhanced the thermal shock resistance, but the strengthening effect diminished as the temperature increased and completely disappeared at 800 °C.
在本研究中，采用预应力涂层增强方法制备了蓝晶石涂层氧化锆增韧氧化铝（ZTA）预应力陶瓷。由于涂层与基体之间热膨胀系数（CTE）不匹配，在涂层中引入了压缩残余应力。已经证明了压缩残余应力对ZTA力学性能的影响。结果表明，与ZTA陶瓷相比，室温下蓝晶石涂层ZTA陶瓷的抗弯强度提高了40%。此外，还讨论了力学性能的温度依赖性。结果表明，随着温度升高，增强作用逐渐减弱，最终在1000℃时消失。材料的弹性模量也呈现出下降趋势。此外，预应力涂层的引入增强了热震抗性，但随着温度升高，强化效果减弱，在800℃时完全消失。
