Impact welding: a superior method of producing joints with high thermal conductivity between metals at very low temperatures
Abstract
To improve the connection between copper and aluminium for use in a superconducting heat switch, three layer Cu-Al-Cu sandwiches have been produced by impact welding. An upper limit of the low-temperature specific thermal Cu-Al contact resistance of 1.3 × 10 -4T K m 2W -1 was found. This is less than half of the lowest specific thermal press contact resistance between two gold plated copper strips, of which electrical resistances at 4.2 K were measured under various surface and clamping conditions. Clamping of clean, smooth surfaces with brass bolts gave almost as good results as soldering with indium.
- Publication:
-
Cryogenics
- Pub Date:
- September 1989
- DOI:
- 10.1016/0011-2275(89)90203-8
- Bibcode:
- 1989Cryo...29..904W