Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Post sintering operation
Patent
1984-05-17
1985-05-21
Sebastian, Leland A.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Post sintering operation
75243, 419 26, 419 38, B22F 100
Patent
active
045185638
ABSTRACT:
A method for manufacturing a slide member by molding an alloy powder composed of, by weight, from 2.5 to 7.5% of Cr, from 0.1 to 3.0% of Mn, from 0.2 to 0.8% of P, from 1.0 to 5.0% of Cu, from 0.5 to 2.0% of Si, from 0 to 3% of Mo, from 1.5 to 3.5% of C, and the balance being Fe with less than 2.0% of impurities into a compressed powder mass under a molding product pressure of 5 to 7 ton/cm.sup.2 ; sintering the compressed powder mass at a temperature of 1020.degree. to 1180.degree. C. to produce a sintered alloy mass; treating the sintered alloy mass for 0.5 to 3 hours by soaking the sintered alloy mass at a temperature from 450.degree. to 550.degree. C. under a reduced pressure of 0.1 to 0.8 atm. while exposing the sintered alloy mass to a gas, the gas having a main component selected from the group consisting of a non-oxidizing type gas and an endothermic type gas, and containing 20 to 40 vol. % of heated steam; and forming a film of tri-iron tetroxide on a surface of the sintered mass and on wall portions of a plurality of pores formed within the sintered mass.
REFERENCES:
patent: 4035200 (1977-12-01), Valentijn
patent: 4388114 (1983-06-01), Suganuma
Kazuoka Koji
Suganuma Tetsuya
Sebastian Leland A.
Toyota Jidosha & Kabushiki Kaisha
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