Cylindrical, iron-based sintered slugs of specified porosity for

Details Cylindrical, iron-based sintered slugs of specified porosity for Cylindrical, iron-based sintered slugs of specified porosity for

1990-08-24

1992-07-14

Roy, Upendra

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

148902, 148514, 428547, B22F 900, C22F 100

Patent

active

051299615

ABSTRACT:
A cylindrical, iron-based sintered slug comprising an iron-based sintered alloy having a surface hardness represented by an HRB of 40-90 is formed such that its interior porosity is 5% or less but greater than 0%, the porosities of both its surface layer regions lying at most 1 mm below its outer and inner surfaces are fixed at at least 3% or less but greater than 0% and the distribution of pores in each of the surface layers is decreased gradually toward the surface.

REFERENCES:
patent: 3901661 (1975-08-01), Kondo et al.
patent: 4018632 (1977-04-01), Schmidt
patent: 4110131 (1978-08-01), Gessinger
patent: 4464206 (1984-08-01), Kumar et al.
patent: 4818301 (1989-04-01), Khare
patent: 4867807 (1989-09-01), Torisaka et al.

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