YANG Shusen 1, CHEN Xiaoge 2, WEN Qian 3
(1.Railway Police College, Zhengzhou 450000, Henan, China; 2.Department of Civil Engineering, Henan Institute of Engineering, Zhengzhou 451191, Henan, China; 3.Department of Mechanical Engineering, Henan Institute of Engineering, Zhengzhou 451191, Henan, China)
Abstract: The Yb2Ce2O7 and Er2Ce2O7 ceramic materials were prepared by solid reaction method. Their phase structure was analyzed by X-ray diffraction method,their microstructures were observed by scanning electric microscope, and their thermal conductivities and thermal expansion coeffi cients were measured by laser-fl ash method and pushing-rod method, respectively. Results show that the synthesized Yb2Ce2O7 and Er2Ce2O7 have typical fluorite structure, their microstructures are very dense and particle boundaries are very clean. Their thermal conductivities are lower than that of YSZ, and their thermal expansion coeffi cients are higher than that of YSZ. The synthesized rare earth cerium oxides can be used as candidate ceramic materials for thermal barrier coatings.
Key words: oxides; thermal diffusivity; thermal expansion; thermal barrier coatings