Apiezon greases have been used in various instances as an electrical contact
grease, especially in pressed metallic contacts. The following paper would
be worthwhile reading for anyone contemplating the use of any of these
greases for electrical contact applications. The paper describes work done
on
Apiezon N only, however we believe that while the results should they be
obtained for the other greases would probably be beneficial, but there could
be differences between the different greases. The following is a brief summary of the published paper.
Thermal Conductance of Pressed Metallic Contacts Augmented with Indium Foil or Apiezon Grease at Liquid Helium Temperatures
Authors: L. J. Salerno, P. Kittel, and A. L. Spivak1
NASA-Ames Research Center, Moffett Field, CA 94035
šTrans-Bay Electronics, 3040 Cutting Blvd., Richmond,CA 94804
Received 9 August 1993; revised 17 December 1993
The thermal conductance of pressed contacts which have been augmented with
indium foil or Apiezon
® N grease has been measured over the temperature
range 1.6-6.0°K, with applied forces from 22 to 670 N. The sample pairs were
fabricated from OFHC copper, 6061-T6 aluminum, free-machining brass and 304
stainless steel. Although the thermal conductance was found to increase
with increasing applied contact force, the force dependence was less than in
earlier work. The addition of indium foil or Apiezon N grease between the
contact surfaces resulted in an improvement over uncoated surfaces ranging
from approximately a factor of three for stainless steel to an order of magnitude for copper contacts.
From an applications point of view, either indium foil or Apiezon grease can
easily be applied to contact surfaces, therefore providing a simple and
effective increase in thermal contact conductance at liquid helium temperatures.
Cryogenics Volume 34, Number 8 (1994)
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