| 摘要 |
PURPOSE:To improve the durability of catalyst and reduce securely noxious formations and unburnt fuel components by providing a coating layer of ceramics on the wall surface of metal constituting a combustion chamber of an engine and forming the surface layer of ZrO2 layer coated with welded and blasted ZrO2 powder. CONSTITUTION:On the respective wall surfaces of a piston 12, cylinder head 13, swirl chamber 14, etc. constituting a combustion chamber of an engine is provided a coating layer 18 having a welded and blasted ZrO2 layer and an attached catalyst portion. The coating layer 18 is impregnated with solution of precious metal compound having 300 deg.C or less of decomposition temperature and subjected to overheating decomposition to form the catalyst coating portion after drying. Thus, the durability of the catalyst can be improved so that noxious formations and unburnt fuel components can be reduced securely over a long time. |
