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2705 |
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Wednesday, September 28, 2011, Saal A 12:40 PM Industrial Gas Turbines 1 |
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Thermal shock resistance of gadolinium zirconate coating with addition of nanostructured yttria partially-stabilized zirconia |
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Xinghua Zhong / Shanghai Institute of Ceramics, Chinese Academy of Sciences, P.R. China Huayu Zhao/ Shanghai Institute of Ceramics, Chinese Academy of Sciences., China Xiaming Zhou/ Shanghai Institute of Ceramics, Chinese Academy of Sciences., China Shunyan Tao*/ Shanghai Institute of Ceramics, Chinese Academy of Sciences., China Chuanxian Ding/ Shanghai Institute of Ceramics, Chinese Academy of Sciences., China |
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Gadolinium zirconate (Gd2Zr2O7, GZ) as one of the promising thermal barrier coating materials for high-temperature application in gas turbine was toughened by nanostructured 3mol% yttria partially-stabilized zirconia (3YSZ) incorporation. The fracture toughness of the composite of 90mol%GZ-10mol% 3YSZ (GZ-YSZ) was increased by about 60% relative to the monolithic GZ. Both the GZ and GZ-YSZ coatings were deposited by atmospheric plasma spraying on Ni-base superalloys and then thermal-shock tested in the same condition. The thermal-shock resistance of GZ-YSZ coating was improved significantly, which is believed to be mainly attributed to the enhancement of fracture toughness by the addition of nanostructured 3YSZ. The phase compositions of the as-sprayed coatings were analyzed by X-ray diffraction (XRD) and the microstructures of the as-sprayed and thermal-shocked coatings were investigated by scanning electron microscopy (SEM). In addition, the failure mechanisms of the thermal-shock tested GZ and GZ-YSZ coatings were also discussed. |