Browse Prior Art Database

All Metal Paste for Thermal Contact Between Pistons And Walls

IP.com Disclosure Number: IPCOM000121696D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 41K

Publishing Venue

IBM

Related People

Hodgson, RT: AUTHOR [+3]

Abstract

Disclosed is a method and a material for conducting heat from semiconductor computer chips to a piston and from the piston to a cylinder enclosing the piston and from the cylinder to a cooling medium such as water or air. All-metal pastes have much higher thermal conductivity than oil typically used as the heat transfer material, and the all- metal paste could make much better thermal contact between a chip and a piston resting on the chip and between the piston and the cylinder walls enclosing the piston. We propose coating the piston and the cylinder (manufactured typically from aluminum) with a layer of tungsten or CVD carbon so that the metal paste (made from gallium or indium-gallium alloy and tungsten) will not react with the piston or walls. The metal paste can be used as a heat transfer medium.

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All Metal Paste for Thermal Contact Between Pistons And Walls

      Disclosed is a method and a material for conducting heat
from semiconductor computer chips to a piston and from the piston to
a cylinder enclosing the piston and from the cylinder to a cooling
medium such as water or air. All-metal pastes have much higher
thermal conductivity than oil typically used as the heat transfer
material, and the all- metal paste could make much better thermal
contact between a chip and a piston resting on the chip and between
the piston and the cylinder walls enclosing the piston.  We propose
coating the piston and the cylinder (manufactured typically from
aluminum) with a layer of tungsten or CVD carbon so that the metal
paste (made from gallium or indium-gallium alloy and tungsten) will
not react with the piston or walls.  The metal paste can be used as a
heat transfer medium.  In addition, the coating of CVD carbon has
been shown to be a good heat conductor and a good electrical
insulator, so that the metal paste can still be used when the chip
floats at a different potential than the ground potential.

      If the metal paste is used, the piston can fit much more
tightly in the cylinder than if an oil film is used, because the chip
need not be parallel with the piston end to as high a degree of
accuracy and therefore the piston walls can be more highly parallel
with the cylinder walls. Suppose that the tolerance on the variation
of the height of the chip over the su...