Yttria partially stabilized nanostructured zirconia coatings were prepared by atmospheric plasma spraying (APS). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were applied to analyze the nanostructured coatings and that after heat-treatment. Thermal conductivity were also measured by laser pulsed diffraction method. It was found that the as-sprayed zirconia coating had an average grain size of 67nm, and mainly composed of metastable tetragonal phase, together with some monoclinic phase and tetragonal phase. The thermal diffusivity of the as-sprayed nanostructured zirconia coating was 2.15×10-3~2.75×10-3cm2/s between room temperature and 800��, but 2.65×10-3~3.25×10-3cm2/s for the coating after heat treatment at 1050�� for 34 hours.
Zhou Chungen, Wang Na, Gong Shengkai, Xu Huibin.Effect of thermal treatment on thermal diffusivity of nanostructured zirconia coating[J] JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2004,V30(10): 949-952