【作者】 赵亮； 薛群虎；

【Author】 ZHAO Liang;XUE Qunhu;College of Materials and Mineral Resources,Xi’an University of Architecture and Technology;Shaanxi Techno-institute of Recycling Economy;

【机构】 西安建筑科技大学材料与矿资学院； 陕西循环经济工程技术院；

【摘要】 分别以MgO和MgO+Y₂O₃为稳定剂、单斜氧化锆细粉为主要原料制备了部分稳定ZrO₂陶瓷试样,借助X射线衍射仪、扫描电子显微镜和能谱仪等表征手段,研究了在工作温度下SiO₂杂质对部分稳定ZrO₂陶瓷中稳定剂固溶过程的影响。结果表明:1 710℃烧结2 h后,MgO单一稳定的ZrO₂陶瓷试样中稳定剂固溶并未达到平衡状态,一部分MgO稳定剂会富集在SiO₂杂质集中的位置形成低熔点相,导致试样中氧化锆稳定相含量较少。随着在1 540℃工作温度下保温时间的延长,低熔点相会逐步分解,MgO稳定剂的固溶和氧化锆陶瓷的稳定化会在8 h内完成;而MgO+Y₂O₃复合稳定的试样在烧成后稳定剂的固溶已基本完成,1 540℃热处理后SiO₂杂质对稳定剂分布及稳定化程度基本没有影响。更多还原

【Abstract】 The partially stabilized zirconia ceramic samples were prepared using desilicated zirconia powder as raw material,MgO or MgO+Y₂O₃ as stabilizers.The influence of SiOfe impurity on solid solution process of stabilizers in the PSZ ceramic under working temperature was studied by XRD,SEM and EDS.Results show that the zirconia ceramic after sintering at 1 710 t for 2 h can not be stabilized by MgO completely,and some MgO are enriched in the area of impurity SiO₂ forming low-melting phase so the stability degree of sample can not reach its equilibrium state.The low-melting phase composed of SiO₂ and MgO decomposed partly with prolonging dwelling time of heat treatment at working temperature of 1 540 t,and the solid solution of MgO stabilizer and stabilization of the sample can be completed in 8 h.For zirconia ceramic sample stabilized by MgO+Y₂O₃,solid solution had been completed after sintering at 1 710℃ for 2 h,the SiO₂ has little influence on the stability degree of sample and the distribution of MgO+Y₂O₃ stabilizers with prolonging dwelling time of heat treatment.更多还原