Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1986-06-06
1988-11-29
Pellinen, A. D.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
174 163, 357 81, H05K 720
Patent
active
047886277
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.
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Ehlert Michael R.
Helderman Earl R.
Lovell William S.
Malkin Jay K.
Pellinen A. D.
Tektronix Inc.
Wysocki A. Jonathan
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