Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder shape or size characteristics
Patent
1993-05-20
1995-05-09
Mai, Ngoclan T.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder shape or size characteristics
419 30, 419 39, 419 47, 75245, 75248, B22F 312
Patent
active
054137519
ABSTRACT:
High density heatsinks for microcircuit packages are formed by first mold-pressing a composite powder of free-flowing spray-dried particles of copper and at least one other denser material such as tungsten and/or molybdenum, the proportions of which are adjusted to match the thermal expansion characteristics of the microcircuit material. The pressed compacts are then heated in a sintering furnace at 1,200.degree. C. to 1,350.degree. C. in order to effect an homogeneous distribution of the melting copper throughout the structure. The process results in a readily usable component having good thermal conductivity and matched thermal expansion that requires no further machining.
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Giniel Walter V.
Hermes Terrence V.
Ocheretyansky Vladimir
Polese Frank J.
Buchaca John D.
Charmasson Henri J. A.
Mai Ngoclan T.
Polese Frank J.
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