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5385 |
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Effect of spray parameters on plasma characteristic and microstructure of YSZ coatings deposited by very low pressure plasma spray |
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Lin Zhu* / China First Heavy Industries, Tianjin Heavy Equipment Engineering Co., Ltd., P.R. China Nannan Zhang / Shenyang University of Technology, China Rodolph Bolot/ UTBM, France Hanlin Liao/ UTBM, France Christian Coddet/ UTBM, France |
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Very low pressure plasma spray (VLPPS), or low pressure plasma spray-thin film (LPPS-TF), operating at the pressure of 1 mbar, has been extensively studied in recent decade. In this study, YSZ coatings were deposited with different spray parameters by VLPPS using plasma gun F4-VB and the plasma characteristics were also measured by optical emission spectrum (OES). The OES patterns indicated that more particles with the size range of 10-25 ¼m can be evaporated when using higher spray power, meanwhile the more condensation of YSZ vapor can be found in the coating. However, due to the limited spray power, the as-sprayed coatings exhibited a hybrid microstructure of splat and vapor condensation. A completed columnar microstructure of coatings cannot be obtained. |