Characterisation of micrometre- and nanostructured atmospheric plasma sprayed zirconia-8%yttria thermal barrier coatings

摘要

The thermal barrier coatings of nanostructured and micrometre structured 8 wt-% yttria partially stabilised zirconia (8YSZ) were prepared by atmospheric plasma spraying on 316L stainless steel. The microstructure, phase composition, hardness, adhesion strength, friction wear, oxidation resistance and thermal shock behaviour of the as sprayed coatings were studied. The X-ray diffraction pattern showed that the phase composition of nanostructured 8YSZ coating was different from the powder. The wear resistance of nanostructured 8YSZ coating significantly increased compared with that of the micrometre structured coating. The hardness, adhesion strength and thermal shock lifetime of nanostructured 8YSZ coating is higher than that of the micrometre structured one. In addition, the antioxygenic property of the nanostructured 8YSZ coating was slightly better than that of the micrometre structured 8YSZ coating.