Heat sink device using composite metal alloy
AssigneeTektronix, Inc.
InventorsMichael R. Ehlert, Earl R. Helderman
Life of this patent
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Abstract
The present invention involves a metal alloy heat sink containing tungsten, copper, and nickel. The heat sink is affixed to a ceramic substrate which supports one or more heat-generating electrical components. By adjusting the ratio of tungsten, copper, and nickel, substantial matching of the heat sink CTE with the substrate CTE is possible. Because the CTE of the heat sink is matched with that of the substrate, problems associated with differential thermal expansion are minimized, including micro-cracking and delamination. In addition, the completed heat sink has a relatively high thermal conductivity, and is capable of dissipating substantial amounts of heat.
Claims9
A heat sink consisting essentially of about 75-95% by weight tungsten, about 3-23% by weight copper, and about 2% by weight nickel.
A component package comprising:
- at least one semi-conductor device;
- a substrate having said semi-conductor device affixed thereto;
- and
- a heat sink affixed to said substrate, said heat sink consisting essentially of about 75-95% by weight tungsten, about 3-23% by weight copper, and about 2% by weight nickel.
A method for manufacturing an electrical component package comprising the steps of:
- securing at least one semi-conductor device to a substrate;
- obtaining the coefficient of thermal expansion for said substrate;
- combining about 0-98% by weight of a metal selected from the group consisting of tungsten and molybdenum, about 0-98% by weight copper, and about 0.1-5% by weight metallic binder in proportions sufficient to form a heat sink having a coefficient of thermal expansion substantially matched with that of said substrate;
- and
- securing said substrate to said heat sink.
A method for manufacturing an electrical component package comprising:
- securing at least one semi-conductor device to a substrate;
- and
- securing said substrate to a heat sink, said heat sink consisting essentially of about 75-95% by weight tungsten, about 3-23% by weight copper, and about 2% by weight nickel.
Dependencies are inferred from the claim text.