Sintered alloy for valve seat having excellent wear resistance and method for producing the same
AssigneeHyundai Motor Company
InventorJung Seok Oh
Life of this patent
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Abstract
A sintered alloy composition for automotive engine valve seats, and a method for producing the same, are described. An iron base sintered alloy composition comprising vanadium carbide particles, Fe—Co—Ni—Mo alloy particles, and Cr—W—Co—C alloy particles in which the composition is dispersed in a structure of sorbite is particularly suitable for use as materials of valve seats for automotive engines which requires excellent wear resistance, high-performance, high-rotation-speed, and low-fuel-consumption.
Claims25
A sintered alloy comprising:
- between about 0.7 to about 1.3 weight % of vanadium carbide particles;
- between about 84 to about 86 weight % of Fe—Co—Ni—Mo alloy particles;
- and
- between about 12.5 to about 13.5 weight % of Cr—W—Co—C alloy particles.
A sintered alloy comprising:
- at least about 0.7 weight % of metal-carbide particles;
- Fe—Co—Ni—Mo alloy particles, wherein the Fe—Co—Ni—Mo alloy particles contain an alloy comprising about 86 to about 93 weight % of Fe, about 5 to about 8 weight % of Co, about 1 to about 3 weight % of Ni, and about 1 to about 3 weight % of Mo;
- and
- at least 11.5 weight % of Cr—W—Co—C alloy particles, wherein the Cr—W—Co—C alloy particles contain an alloy comprising about 48 to about 80 weight % of Cr, about 8 to about 25 weight % of W, about 10 to about 25 weight % of Co, and about 1 to about 3 weight % of C, wherein the metal-carbide particles, Fe—Co—Ni—Mo alloy particles, and Cr—W—Co—C alloy particles are mixed and then are sintered into a substantially homogeneous porous structure;
- and
- an infiltrating material disposed in the porous structure.
A method for producing the sintered alloy for valve seat comprising the steps of:
- mixing 84 to 86 weight % of Fe—Co—Ni—Mo alloy powder, 12.5 to 13.5 weight % of Cr—W—Co—C alloy powder, 0.7 to 1.3 weight % of vanadium carbide powder, and 0.6 to 1.3 weight % of graphite powder to form a substantially homogeneous mixture;
- applying pressure and heat to the substantially homogeneous mixture in amounts sufficient to sinter the substantially homogeneous mixture into a porous sintered composition;
- infiltrating with an infiltration material to form an infiltrated sintered alloy;
- and
- quenching the infiltrated sintered alloy.
Dependencies are inferred from the claim text.