Characteristics of in-fight powder particles and thermal barrier gradient coatings by plasma spray

2^nd International Conference and Expo on Ceramics & Composite Materials

July 25-26, 2016 Berlin, Germany

Jing Chen, Sheng Lu, Zhao-peng Liu, Shu-hua Mao, Ze-xin Wang and Li-hui Tian

Jiangsu University of Science and Technology, China

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

In the present work, three kinds of coatings, i.e.NiCoCrAl-Y2O3 coating, NiCoCrAl-Y2O3/AZ50 thermal barrier coating and NiCoCrAl-Y2O3/AZ50 thermal barrier gradient coating, were sprayed on the surface of K417 nickel-based high temperature alloy by plasma spraying. The physical characteristics of in-flight particles and related influences of spraying process parameters were investigated by Spray Watch on-line measuring system. The surface roughness and microstructure characteristics of the coatings were studied by Confocal Laser Scanning Microscopy (CLSM) Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and X-ray Diffraction (XRD). The bonding strength, hardness distribution, and thermal shock properties of the coatings were evaluated by tensile, microhardness, and thermal shock tests. The water bath thermostatic method and Oxyacetylene flame heating method were used to investigate the thermal barrier effects of the coatings with different structures. The results show that the bonding strengths and thermal shock resistances of the two kinds of thermal barrier coating are higher than that of the standard HB7269-1996, which are 15MPa and 6 times respectively.

Biography :

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