Valve seat made of sintered iron base alloy having high wear res

Details Valve seat made of sintered iron base alloy having high wear res Valve seat made of sintered iron base alloy having high wear res

1990-11-14

1991-07-16

Chambers, A. Michael

Valves and valve actuation

Valve

Materials

123188S, 75246, F01L 302, B22F 310

Patent

active

050318780

ABSTRACT:
This invention relates to valve seats that are made of a sintered Fe-base alloy that has high wear resistance, that is less hostile to valves and that hence is suitable for use with internal combustion engines such as diesel engines and gasoline engines, particularly those having high power outputs, the sintered Fe base alloy comprising a sintered Fe base alloy substrate having such a structure that hard particles A that contain 25-45% Cr, 20-30% W, 20-30% Co, 1-3% C, 0.2-2% Si and 0.2-2% Nb, with the balance being Fe and incidental impurities, and hard particles B that contain 55-65% Co, 25-32% Cr, 7-10% Mo and 1.5-3.5% Si, with the balance being Fe and incidental impurities, are dispersed in a total amount of 10-25% in an Fe base alloy matrix that contains 1-3% Cr, 0.5-3% Mo, 0.5-3% Ni, 2-8% Co, 0.6-1.5% C and 0.2-1% Nb, with the balance being Fe and incidental impurities, and which has a structure that is mainly composed of a pearlitic and a bainitic phase, all the percents being on a weight basis.

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