| 摘要 |
A cylinder head for an internal combustion engine includes a metallic cylinder head body, and a valve seat. The cylinder head body is provided with an inlet port, and an outlet port which are opened and closed by an inlet valve, and an outlet valve, respectively. The valve seat is disposed at an end of the inlet port or the outlet port, has a contact surface which is contacted with and separated from the inlet valve or the outlet valve, and is formed of a laminated substance. The laminated substance is formed as flakes by thermal spraying particles in a predetermined depositing direction, and the contact surface is inclined by an angle of from 0 to 60 degrees with respect to the depositing direction. In the cylinder head, the valve seat is strongly bonded to the cylinder head body, exhibits improved frictional characteristics on the contact surface, and has such high thermal conductivity in a depth-wise direction that it can be readily cooled to a low temperature.
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