Method for the manufacture of piston ring inserts by a powder me

Details Method for the manufacture of piston ring inserts by a powder me Method for the manufacture of piston ring inserts by a powder me

1983-01-04

1985-10-15

Gron, Teddy S.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 36, 419 38, 75246, B22F 300

Patent

active

045473366

ABSTRACT:
A method for the manufacture of piston ring inserts by a powder metallurgy technique from austenitic ferrous alloys with an equivalent carbon content of more than 2%, said method comprising the following steps: melting a charge composed of an austenitic ferrous alloy having a total carbon content in excess of 2%; pouring the molten alloy and atomizing it by means of a stream of water, air or gas to produce powder of particle sizes ranging from +40 to -325 U.S. mesh, with an austenitic white cast iron structure and virtually no green resistance; annealing the particulate material in a reducing atomsphere; adding the annealed particulate material with a lubricant in such an amount that through a subsequent compacting operation of the particulate material to its final form same will present the highest green compact possible; burning off the lubricant in a protective atmosphere; sintering the compacted material and cooling it abruptly.

REFERENCES:
patent: 2164198 (1944-03-01), Clements et al.
patent: 2882190 (1959-04-01), Thompson et al.
Hirschhoon, J. S.; Introduction to Powder Metallurgy; 1969, pp. 2 to 7.

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