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4612 |
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High temperature performance and structure spatial distribution model of yttria-stabilized zirconia coatings by plasma spray physical vapor deposition |
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Baopeng Zhang* / Beihang University, Beijing Hongbo Guo / Beihang University, Beijing Lihua Gao/ Beihang University, Beijing Liangliang Wei/ Beihang University, Beijing Shengkai Gong/ Beihang University, Beijing Huibin Xu/ Beihang University, Beijing |
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As a novel processing technique, plasma spray physical vapor deposition (PS-PVD) has been developed to deposit uniform and relatively thin coatings. It has been shown that different kinds of yttria-stabilized zirconia (YSZ) microstructures, including dense coatings , PVD-like columnar coatings and nano-sized solid clusters columnar coatings , could be formed. In this work, YSZ coatings were produced by PS-PVD technique at the spray distance between 450 mm and 1400 mm. A structure spatial distribution model was proposed by research on diverse YSZ coating morphologies. Along the radial direction, there is a change from denser type of layer to columnar structure in the morphology of the coatings, which is similar to the axial direction. Meanwhile, high temperature performance including thermal physical properties and sintering resistance of the coatings were measured in order to summarize the relation between microstructures and high temperature properties. The results have shown that YSZ coatings with columnar structure have lower thermal conductivity as well as better anti-sintering performance than coatings with dense lamellar structure. |