Thermal conductance of augmented pressed metallic contacts at liquid helium temperatures
The thermal conductance of uncoated oxygen-free high conductivity (OFHC) copper, 6061-T6 aluminum, free-machining brass, and 304 stainless steel sample pairs which were augmented with a gold coated 6061-T6 aluminum washer inserted between the contact surfaces was measured over the temperature range of 1.6 to 6.0 K, with applied forces from 22 to 670 N. The contact surfaces of the sample pairs were prepared with a 0.8 micron lapped finish, while the finish of the aluminum washer was 0.2 micron lapped. The contribution to the overall thermal impedance by the bulk conductance of the aluminum washer was negligible. It was found that addition of the washer offered no significant conductance improvement over an uncoated single contact pair; any benefits from using the gold plated washer were counteracted by the addition of two more contact surfaces. Additionally, the thermal conductance of a 'combination' aluminum sample pair having one gold coated and one uncoated surface was measured and compared to the washer pair. The ratio of the conductance of the washer pair to half the conductance of the 'combination' pair was found to be constant and near unity over the temperature range of the data obtained, within experimental error.
- Research Organization:
- National Aeronautics and Space Administration, Moffett Field, CA (United States). Ames Research Center
- OSTI ID:
- 6958476
- Report Number(s):
- N-92-32474; NASA-TM--103917; A--92055; NAS--1.15:103917; CNN: RTOP 590-31-41
- Country of Publication:
- United States
- Language:
- English
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Thermal conductance of pressed aluminum and stainless steel contacts at liquid helium temperatures
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
AUSTENITIC STEELS
BRASS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
COATINGS
COPPER
COPPER ALLOYS
COPPER BASE ALLOYS
CORROSION RESISTANT ALLOYS
ELECTRIC CONTACTS
ELECTRICAL EQUIPMENT
ELEMENTS
EQUIPMENT
ERRORS
GOLD
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
INTERFACES
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
METALS
NICKEL ALLOYS
PHYSICAL PROPERTIES
STAINLESS STEEL-304
STAINLESS STEELS
STEEL-CR19NI10
STEELS
SUPERFLUIDITY
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
ZINC ALLOYS