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Hardlayer on Titanium
We have a cryogenic application (4 K) of a titanium shaft
(TiAlVa64) making oscillating movements (about 2.5 degrees) in a AISI
316 sleeve with a pressure load of 73 N/mm2 without any lubrication except liquid Helium. Although there is a reasonable hardness difference, I wonder if a hardlayer on the titanium shaft is needed to prevent pitting or other wear. A hardchrome layer is impossible to get to the surface due to the TiO2-skin.
Your help would be appreciated very much.
University Twente - Enschede, Holland
Aren't the metals (and alloys) already extremely hard and brittle at cryo temperatures? You are nearing absolute zero. A hard coating may not be of use.
- Fort Collins, Colorado
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