Here’s one for the scientists: We would like to sell vacuum insulated pipe for high temperature fluid applications. Are there any good getter materials that we can place in the vacuum space of our VJP to absorb outgassed materials at elevated temperatures?
2 Comments
Tapio Niinikoski
August 1, 2008For vacuum isolated pipes at room temperature, a good solution is NEG films with typical atomic composition of Ti30V40Zr30, deposited on the inner chamber surface by magnetron sputtering.
Cathodes are prepared by twisting together Ti, Zr and V metal wires. SAES Getters SpA, Italy, is fabricating such vacuum chambers [1], based on the technology developed at CERN. Chris Benvenuti is the chief scientist involved in this development. This invention is covered by CERN patents. See http://est-div-sm.web.cern.ch/est-div-sm/Project-Getter-home.htm.
Pre-cleaning of the chamber surface before sputtering is essential to ensure adequate adhesion of the film to the substrate. Suitable cleaning treatments have been developed at CERN for various materials, like steel, aluminum and copper [2].
1. P. Manini et al., Proc. EPAC, Edinburgh, Scotland 2006.
2. P. Costa Pinto, 45th IUVSTA Workshop on NEG Coating for Particle Accelerators and Vacuum Systems, Catania, Italy, 2006.
Michael Rappaport
August 1, 2008The usual place to go for getter materials is SAES Getters (http://www.saesgetters.com/).