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Electrical Isolation of Copper Thermal Cooling Device by Anodizing Aluminum Layer On Cavity Walls

IP.com Disclosure Number: IPCOM000101363D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Singh, PJ: AUTHOR

Abstract

This article describes a mechanism for using aluminum oxide derived from anodization of a thermal cooling device (TCD) aluminum-clad-copper hat cavity to electrically isolate the TCD hat from the TCD piston.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 78% of the total text.

Electrical Isolation of Copper Thermal Cooling Device by Anodizing Aluminum Layer On Cavity Walls

       This article describes a mechanism for using aluminum
oxide derived from anodization of a thermal cooling device (TCD)
aluminum-clad-copper hat cavity to electrically isolate the TCD hat
from the TCD piston.

      The electrically isolating aluminum oxide layer 1 identified on
the wall and bottom surfaces of the copper hat cavity 2, shown in the
figure, is key to the feasibility of the disclosed TCD hat
manufacturing design.  The layer of aluminum 3 is metallurgically
bonded to the wall cavity of the copper hat 4.  The minimum thickness
for the aluminum is determined (a) by the anodization requirement and
(b) by the geometry of the part.  The main process steps involved are
the following:
      a)   The copper TCD hat 4 is machined to final dimensions
except that its cavities are machined and are a little oversize.
Aluminum plugs, one for each cavity, are machined to within 0.0002
inch of the cavity size.
      b)   The aluminum plugs and the copper cavities are then
cleaned, and the aluminum plugs are then inserted and bonded inside
the copper cavities by methods well known in the art.
      c)   The cavities now having the aluminum plugs are now
machined to final dimensions.  All exposed copper surfaces are masked
off, and the aluminum layer of the plug is then anodized to obtain
the desired layer of aluminum oxide.

      The dis...