| 摘要 |
A heat-insulating layer secured to a cast metal member of an internal combustion engine so as to be exposed to combustion gas in the engine. A porous or intersticed metal body, preferably having a soft structure, is used as a fundamental material of this layer. A surface portion of the porous metal body is impregnated with a ceramic material, and then the metal body is cast-inserted into the metal member such that the molten metal infiltrates into another surface portion of the porous metal body and that the ceramic-impregnated portion is exposed to combustion gas in the engine. This heat-insulating layer is excellent in toughness, durability and bonding strength and can be embodied in a combustion chamber wall, exhaust port wall or a top portion of a piston.
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