Process for the manufacture of high-density powder compacts

Details Process for the manufacture of high-density powder compacts Process for the manufacture of high-density powder compacts

1995-03-08

1996-06-25

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Heat and pressure simultaneously to effect sintering

419 38, 419 39, 419 48, 419 51, B22F 316

Patent

active

055297463

ABSTRACT:
The invention relates to a process for pressing electrically conductive powders to high-density compacts in dimensionally stable pressing molds, whereby the achievable compression density is greater than 96% and, in many cases, amounts to almost 100% of the theoretical density of suitable materials. For said purpose, static pressing of the powders according to conventional methods is superimposed by a second process step, in which from 1 to 3 electric current pulses of from 5.times.10.sup.-5 to 5.times.10.sup.-2 s duration and high electric power are applied to the punches of the press. As opposed to known methods, no notable sintering of powder of particles occurs in such process. The process is especially suitable for the manufacture of high-density and high-strength, sintered mass-produced components, where compacts are produced on automatic presses with high cycle frequencies.

REFERENCES:
patent: 3567903 (1971-03-01), Parker
patent: 4102679 (1978-07-01), Arvela
patent: 4929415 (1990-05-01), Okazaki
patent: 4989153 (1991-01-01), Bonvini
patent: 5178691 (1993-01-01), Yamashita et al.
patent: 5201962 (1993-04-01), Yamashita et al.
patent: 5427660 (1995-06-01), Kamimura et al.

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