【摘要】 以Gd₂O₃、Sm₂O₃、Yb₂O₃和ZrOCl₂·8H₂O为原料,采用化学共沉淀法合成了一种新型的多元稀土锆酸盐(Gd_0.4Sm_0.5Yb_0.1)₂Zr₂O₇陶瓷粉体,在1600℃无压烧结10h合成了致密的陶瓷块体。用X射线衍射仪（XRD）及场发射扫描电镜（SEM）对粉体和块体的微观结构进行了表征,采用激光闪射法测试了块体的导热性能。结果表明,制备的多元稀土锆酸盐陶瓷粉体具有焦绿石结构,晶粒细小,陶瓷的热导率明显低于一元稀土锆酸盐Sm₂Zr₂O₇的热导率。该研究结果显示(Gd_0.4Sm_0.5Yb0.12Zr₂O₇多元稀土锆酸盐陶瓷有可能应用于热障涂层陶瓷层材料。更多还原

【Abstract】 Using Gd₂O₃,Sm₂O₃,Yb₂O₃ and ZrOCl₂·gH₂O as raw materials,a novel multicomponent rare earth zirconate (Gd_0.4Sm_0.5Yb_0.1)₂Zr₂O₇ ceramic powder was synthesized by coprecipitation process.The powder was pressed into the compacts which were sintered into the ceramic bulks at 1600℃for 10h.The phase composition and the microstructures of the powder and bulks were identified by XRD and SEM.The thermal conductivities of the bulks were measured by laser pulse method.The resuts show that the prepared powder has pyrochlore structure,and fine particle size.The thermal conductivity of the novel ceramic is lower than that of Sm₂Zr₂O₇.These results indicate that(Gd_0.4Sm_0.5Yb_0.1)₂Zr₂O₇ can be used explored as the candidate material for the thermal barrier coatings in TBCs system.更多还原