Wear-resistant sintered ferrous alloy for valve seat

Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles

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428546, 428567, 428568, B22F 700

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054984831

ABSTRACT:
A wear-resistant sintered ferrous alloy for use as a valve seat, the alloy comprising an iron-based matrix having a sorbite or pearlite structure consisting of 0.5 to 1.5% by weight of C, 0.5 to 3% by weight of Ni, 0.5 to 2% by weight of Mo, 0.1 to 8% by weight of Co, 0.05 to 1% by weight of Mn, and the balance of Fe, with unavoidable impurities, and having a Vickers hardness of from 300 to 450; hard particles A consisting of 1.5 to 2.5% by weight of C, 38 to 45% by weight of Cr, 18 to 30% by weight of W, 5 to 15% by weight of Co, 0.5 to 3% by weight of Mo, 0.03 to 0.5% by weight of Ti, and the balance of Fe, with unavoidable impurities, and having an average particle diameter of from 30 to 80.mu.m; and hard particles B consisting of 60 to 70% by weight of Mo, 0.5 to 2% by weight of Si, and the balance of Fe, with unavoidable impurities, and having an average particle diameter of from 30 to 80 .mu.m, the hard particles A and the hard particles B being uniformly dispersed in the iron-based matrix in a total amount of from 10 to 25% by weight based on the total weight of the iron-based matrix, the hard particles A, and the hard particles B.

REFERENCES:
patent: 4505988 (1985-03-01), Urano et al.
patent: 5031878 (1991-07-01), Ishikawa et al.
Production of Rapidly Solidified Metals and Alloys, Journal Of Metals, Apr. 1984, pp. 20-22.

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