| 摘要 |
A compressor wheel for a turbocharger comprising a central hub 24 and a plurality of impeller blades 25 extending outwardly from the hub. Each of the blades defines a leading edge 27, a trailing edge 28 and a root portion 26 which connects the blade to the hub. At least one of the blades has a surface provided with a variable thickness surface layer of a ceramic material. The leading edge of the blade is provided with a thicker surface layer of the ceramic material than the trailing edge and/or root portion of the blade. The ceramic layer may be formed by using any suitable process, for example anodising or plasma electrolytic oxidation (PEO). A second invention is disclosed in which a compressor wheel having at least one blade having a plastically deformed surface provided with a surface layer of ceramic material is provided, the plastic deformation may be achieved by shot peening or laser peening. |
