H - Electricity – 05 – K
Patent
H - Electricity
05
K
347/36, 356/95
H05K 7/20 (2006.01) F28F 13/00 (2006.01) F28F 21/08 (2006.01) H01L 23/373 (2006.01) H01L 23/42 (2006.01)
Patent
CA 1083263
A PREFABRICATED COMPOSITE METALLIC HEAT-TRANSMITTING PLATE UNIT ABSTRACT OF THE DISCLOSURE A prefabricated composite metallic plate unit for transmitting heat between a heat-absorbing medium having a planar surface such as a heat sink and a body having a planar surface and aubject, during normal operation, to wide temperature excursions and having a predetermined temperature coefficient of expansion, comprises a high-tensile-strength metallic plate member having a temperature coefficient of expansion substantially the same as that of the body and substantially planar opposed surfaces indi- vidually in contact with the planar surface of the body and in contact with the heat sink. The heat-transmitting member is adapted to be supported on the heat sink and to support the body therefrom and has a high tensile strength, for example at least 35 kg/mm2. The heat-transmitting member has a plurality of holes uniformly distributed with respect to its planar surfaces, the aggregate area of such holes being less than about 45% of the total areas of such planar surfaces and the total volume thereof being less than about 45% of the volume of said metallic member. The holes in the metallic member are filled with a soft metal of the group comprising silver, copper, aluminum and an alloy of any of these three metals and has a heat-transfer coefficient of at least 0.3 cal./cm2/cm/sec./°C. In a preferred embodiment of the invention, the body to be supported is a semiconductor body and the heat-transmitting member is a nickel-iron or nickel-cobalt- iron alloy having a temperature coefficient of expansion of about 5 x 10-6 cm/cm/°C over a temperature range of about 20°C to 400°c.
303080
Gowling Lafleur Henderson Llp
Semi-Alloys Inc.
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