PURPOSE: To prevent the catalyst performance from being deteriorated even during a long operation by depositing a catalyst metal on an oxide layer formed on at least part of the inner wall surface of a sub-combustion chamber or the surface of a glow plug then forming an oxide layer on the layer.
CONSTITUTION: An intermediate layer 7 made of an Ni-Cr-Al alloy is formed on the inner wall surface of a sub-combustion chamber 3 or the surface of a glow plug 1, and a composite oxidized layer 8 with composition of ZrO2-CaO is formed on the layer 7. Furthermore, it is immersed in a solution of dinitrodiamino platinum and rhodium chloride than is taken out, a catalyst metal (Pt, Rh) is deposited, next, it is immersed in an alumina slurry liquid then is taken out to form an alumina layer 9. Accordingly, stable ignition performance and startability can be maintained without deteriorating the catalyst performance.
SAKURAI SHIGENORI
MATSUMOTO SHINICHI
Next Patent: JPS6032928