| 摘要 |
There is provided an internal combustion engine valve having a body, a head, and a contact surface disposed on a head surface to be adapted to periodically enter into gas-sealing engagement with a valve seat, said contact surface being formed in alloy deposit welded to said valve head, by a high density energy beam such as a plasma beam or a laser beam, on said head surface, a cobalt based composition of said alloy deposit, measured at said contact surface, consisting essentially of carbon : 2.2 to 2.6 weight percent; silicon: 1.1 to 1.3 weight percent ; manganese: 2.6 to 3.1 weight percent ; nickel: not more than 1.5 weight percent ; chromium: 28 to 31 weight percent ; iron: 10 to 11 weight percent ; tungsten: 13.5 to 15.5 weight percent ; balancing cobalt and inevitable amount of impurities. |
