Sintered alloy for valve seat and manufacturing method of exhaust valve seat using the same
AssigneesHyundai Motor Company, Korea Powder Metallurgy Co., Ltd., Kia Motors Corporation
InventorsPhilgi Lee, Gyuhwan Kim, Jae Suk Park, Ki Bum Kim, Chang-Jin Shin
Life of this patent
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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.
Claims11
A sintered alloy for valve seat, comprising:
- MnS is added to an alloy that comprises 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.
A manufacturing method of valve seat, the method comprising:
- mixing MnS with an alloy powder for a 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 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.
Dependencies are inferred from the claim text.