The Study of the Coating Surface of Gas TurbineCompressor Blades
| Autor: | Ying-Hui Lai, 賴瑩徽 |
|---|---|
| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 In this study, the inorganic coating and atmospheric plasma spray (APS) coating were applied to the SUS420J2 stainless steel which was the material of gas turbine compressor blades. The results showed that the inorganic coating consisted of the AlPO4, Cr2O3 and pure Al after the coating being heated, and the APS coating consisted of the γ-(Ni,Co,Cr) phase. Microstructural observation showed that, in the inorganic coating, the pure Al was surrounded by the AlPO4 and Cr2O3 and formed a compact coating without voids; the APS coating was loose and contained voids, oxides and un-melted powders. The thickness of the inorganic coating and the APS coating was 25~45μm and 75~125μm,respectively. The surface roughness of the inorganic coating was Ra 0.7μm and was lower than that of the APS coating, which was over Ra 40 μm. The abrasion test revealed that the inorganic coating and the APS coating had abrasion resistance ratio 73 and 41,respectively. Both of these two coatings were classified as the abrasion-resistant coating. Comparing these results, it could be concluded that the inorganic coating was suitable for the compressor blades. After the inorganic coated blade was applied to the compressor for 78,932 hours, the coating thickness remained 5 μm. The coated blade had no sign of pitting, stains or erosions. It could be concluded that the inorganic coating could protect the blade and extend the blade lifetime. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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