| 摘要 |
A valve seat-bonded cylinder head, in which a valve seat is bonded to a cylinder head unit, which valve seat is formed of material different from and harder than that of said cylinder head unit, wherein the valve seat is bonded to the cylinder head unit by solid-state diffusion, without forming a melting reaction layer therebetween, and a plastic deformation layer is formed on the bonding boundary at least on the cylinder head unit side, thereby allowing for an increase in the bonding strength, and reduction in the size of the valve seat area.
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