Q. Li, S. Li, W. Yang, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing, China; J. Wu, Wuhan Research Institute of Materials Protection, Wuhan, China
The technology and thermal shock properties and thermal conductivity of plasma sprayed nanostructured yttria-stabilized zirconia thermal barrier coatings are studied in this paper. The TBCs on the substrate of Ni3Al based alloy IC-10 were fabricated by using of the nanostructured yttria-stabilized zirconia powder under certain plasma spraying conditions. By manipulating plasma spray process, the nanostructured TBCs were obtained. The specimens were thermally shocked from 1000C, 1100 C and 1200C to the water which temperature was about 20C and the morphology and microstructure of the TBCs were evaluated by light microscopy, scanning electron microscopy (SEM) and transmission electron microscopy(TEM). The thermal diffusivity was tested by a laser pulse method. The results showed that the nanostructured TBCs had a more than 30% reduction in thermal conductivity and the thermo shock lifetimes were much longer than that of the conventional TBCs.
Summary: The technology and thermal shock properties and thermal conductivity of plasma sprayed nanostructured yttria-stabilized zirconia thermal barrier coatings are studied in this paper. The TBCs on the substrate of Ni3Al based alloy IC-10 were fabricated by using of the nanostructured yttria-stabilized zirconia powder under certain plasma spraying conditions. By manipulating plasma spray process, the nanostructured TBCs were obtained. The specimens were thermally shocked from 1000, 1100 and 1200 to the water which temperature was about 20 and the morphology and microstructure of the TBCs were evaluated by light microscopy, scanning electron microscopy (SEM) and transmission electron microscopy(TEM). The thermal diffusivity was tested by a laser pulse method. The results showed that the nanostructured TBCs had a more than 30% reduction in thermal conductivity and the thermo shock lifetimes were much longer than that of the conventional TBCs.
