Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article
Patent
1982-08-26
1984-06-26
Hunt, Brooks H.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making composite or hollow article
419 52, 4251746, B22F 314
Patent
active
044565780
ABSTRACT:
A friction element for a motor car or motor cycle disc brake is produced by pressing a powdered friction material in a die cavity using first and second resistance heating electrodes. The friction material is thereby sintered and bonded to a backing plate which closes one end of the die cavity. The first electrode has a backing plate-engaging end surface formed with a recess therein which is partly filled by a graphite insert which is less electrically conductive than the remainder of the first electrode. The second electrode may have a similar insert therein and may either engage the friction material directly or through the intermediary of a graphite sub-electrode. In this way, a good electrical contact between the friction material and the electrode and a uniform current flow through the material can be obtained.
REFERENCES:
patent: 2180988 (1939-11-01), Lemmers et al.
patent: 2195297 (1940-03-01), Engle
patent: 3891398 (1975-06-01), Odier
patent: 3946192 (1976-03-01), Allen et al.
patent: 4147488 (1979-04-01), Chiron
Hunt Brooks H.
Lucas Industries
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