【摘要】 采用液相法制备16mol%钙稳定的氧化锆粉体,通过传统陶瓷烧结工艺,在无压氧化气氛中制备了16Ca-ZrO2陶瓷,通过XRD物相分析法,研究了表面研磨以及后续热处理条件对16Ca-ZrO2陶瓷相结构的影响。结果表明:16Ca-ZrO2陶瓷的晶相结构为立方相,16Ca-ZrO2陶瓷经过表面研磨后,在XRD图谱上观察到(111)c衍射峰低角度方向出现隆起。隆起的形成是由于表面研磨使材料表面产生残余压应力,应力诱导立方相转变为三方相,生成的三方相在XRD图谱上与主晶相叠合;隆起程度与表面残余压应力大小成正相关性。高温退火后,消除残余应力,三方相又转变为立方相,隆起消失。更多还原

【Abstract】 16mol% calcium stabilized zirconia(16Ca-ZrO2) powder were prepared by liquid-phase method.16Ca-ZrO2 ceramics were fabricated by conventional process and pressurelessly sintering in O2.In order to clarify phase structure changes of 16Ca-ZrO2 ceramics,the effects of surface grinding and the subsequent heat treatment were investigated by XRD.The results indicate that the crystal structure of 16Ca-ZrO2 ceramics is cubic phase.a uplift observed on the left shoulder of(111)c peaks when16Ca-ZrO2 after surface ground.A residual compreesive stress,which would induce cubic-to-rhombohedral phase transition,formed as a result of surface grinding.And the uplift was due to the diffraction peak of the newly rhombohedral phase superimposed with the main cubic phase in the XRD patterns.A positive correlation between degree of uplift and residual stress.The uplift completely disappeared by annealing and rhombohedral phase transform reversibly to the original cubic phase due to disappearance of residual stress.更多还原