Sintered alloy for valve seat and manufacturing method of exhaust valve seat using the same
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsPhilgi Lee, Gyuhwan Kim, Jae Suk Park, Ki Bum Kim, Chang-Jin Shin
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Abstract
A sintered alloy for a valve seat may be manufactured using a method including: mixing MnS with an alloy powder for a valve seat including C at 0.8-1.2 wt %, Ni at 2.0-4.5 wt %, Cr at 3.0-5.0 wt %, Mo at 16.0-20.0 wt %, Co at 9.0-13.0 wt %, V at 0.05-0.15 wt %, S at 0.2-0.8 wt %, Fe, and additional inevitable impurities; making a first shape by forming the mixed materials; pre-sintering the first formed shape; making a secondary shape by re-pressing the first pre-sintered shape; main-sintering the secondary shape; and tempering the main-sintered secondary shape.
Claims6
A manufacturing method of a valve seat, the method comprising:
- mixing MnS with an alloy powder for the valve seat comprising C at 0.8-1.2 wt %, Ni at 2.0-4.5 wt %, Cr at 3.0-5.0 wt %, Mo at 16.0-20.0 wt %, Co at 9.0-13.0 wt %, V at 0.05-0.15 wt %, S at 0.2-0.8 wt %, Fe, and additional inevitable impurities;
- making a first shape by forming the mixed materials;
- pre-sintering a first formed shape;
- making a secondary shape by pressing a first pre-sintered shape;
- main-sintering the secondary shape;
- and
- tempering the main-sintered secondary shape.
Dependencies are inferred from the claim text.