Thermal conductance of augmented pressed metallic contacts at liquid helium temperatures

摘要: 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 aluminum washer inserted between the contact surfaces was measured over temperature range 1.6 to 6.0 K, applied forces from 22 670 N. prepared 0.8 micron lapped finish, while finish 0.2 lapped. contribution overall impedance by bulk negligible. It found that addition offered no significant improvement an single pair; any benefits using plated counteracted two more surfaces. Additionally, 'combination' pair having one surface compared pair. ratio half be constant near unity data obtained, within experimental error.