| 摘要 |
PURPOSE:To aim at improvements in strength to high temperature or the like and prevention against separation, by making up an intake valve seat corresponding part of a cylinder head body into fiber reinforcing metalization, while installing a convering layer made of made of a wearproof material, making an Al alloy or the like a base material, in a valve hitting surface part. CONSTITUTION:An intake valve seat corresponding part of a cylinder head body 3 is made up into a fiber reinforced metal (FRM)2, while a covering layer 4 made of a wear-proof material, making an Al alloy or a Mg alloy a base material, is installed in a valve hitting surface part 5. At this time, as a reinforcing metallic fiber, a ferrofiber of steel of S15 or the like and cast iron or an alloy fiber of an Ni system or the like so desirable. And, as a metallic fiber, if it is a long fiber, such one of 10-300mum in filament diameter but if it is a short fiber, 2.0-20mum in filament diameter and 10-500mum in length are desirable as well as it is desirable each of them is contained at a bulking rate of 5.0-40%. With this constitution, strength to high temperature and rigidity in the valve hitting surface part 5 are well improved and, what is more, separation in the covering layer 4 is preventable. |
