Impact welding: a superior method of producing joints with high thermal conductivity between metals at very low temperatures

Willekers, R.W.; Bosch, W.A.; Mathu, F.; Meijer, H.E.H.; Postma, H.

doi:10.1016/0011-2275(89)90203-8

Cited by 12 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…-We have performed tests using magnetic pulse welding inspired by developments in another field [32] but the results were not satisfactory. -Impact welding, as successfully achieved by Willekers et al [30] could be a promising approach, however it is unclear what effect this process might have on the highly annealed copper and aluminium required for our application.…”

Section: Nds-1mentioning

confidence: 99%

See 1 more Smart Citation

Very low resistance Al/Cu joints for use at cryogenic temperatures

Triqueneaux,

Butterworth,

Goupy

et al. 2020

Preprint

View full text Add to dashboard Cite

We present two different techniques for achieving low resistance (<20 nΩ) contacts between copper and aluminium at cryogenic temperatures. The best method is based on gold plating of the surfaces in an e-beam evaporator immediately after Ar plasma etching in the same apparatus, yielding resistances as low as 3 nΩ that are stable over time. The second approach involves inserting indium in the Al/Cu joint. For both methods, we believe key elements are surface polishing, total removal of the aluminum oxide surface layer, and temporary application of large (typ. 11 kN) compression forces. We believe the values for gold plated contacts are the lowest ever reported for a Cu/Al joint of a few cm 2 . This technology could simplify the construction of thermal links for advanced cryogenics applications, in particular that of extremely low resistance heat switches for nuclear demagnetization refrigerators.

show abstract

Section: Nds-1mentioning

confidence: 99%

“…-Okamoto et al [29] used non cyanide gold plating solutions.Their best results -4 nΩ -were obtained adding an indium filler. -Willekers et al [30] used impact welding and achieved 32 nΩ.…”

Section: Nds-1mentioning

confidence: 99%