Method for making cylindrical, iron-based sintered slugs of spec

Details Method for making cylindrical, iron-based sintered slugs of spec Method for making cylindrical, iron-based sintered slugs of spec

1992-03-18

1993-04-13

Roy, Upendra

Metal treatment

Process of modifying or maintaining internal physical...

Treating consolidated metal powder, per se

148902, 419 41, 419 67, B22F 900, C22F 100

Patent

active

052019667

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: 4364162 (1982-12-01), Nilsson et al.
patent: 4867807 (1989-09-01), Torisaka et al.

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