Galling Solution Advantages Disadvantages Comments Silver copper coating

Galling Solution Advantages Disadvantages Comments Silver / copper coating Solid Not easy to do (neither at CERN neither outside) – very thin coating (3 um) PVD deposition could be an alternative These coatings release always particles 4) Ti anodization Solid, easy to have (common coating) very thin coating (3 um) Often use to change the colour, not specific for galling. Use in Ti implants 3 IBE surface treatment Solid 457€ per set (≈2 -5 € /bolt) Never tested. Should be suitable for UHV 2 Dicronite dry lubricant “anti-galling” declared, used in SPL 3) and XFEL 3) ? Never used at CERN 1 Molykote® 321 Dry Film Lubricant Spray Cheap, used in UHV devices for nuclear plan 1) Cryolab 2), already used in tiny amount, accepted for He vessel (coating if possible) Solvent dispersion of Mo. S 2, graphite and inorganic binder / Used in Linac 4 (at warm) Vacuum grease (Apiezon N) Used in all the cryostat devices (vacuum sealing, thermal coupling…) Used in collimators, radiation resistant Used for sealing. To be tested Silicone oil + Inorganic thickener 1 baseline 1) Ref. A. Lafuente Mazuecos 2) Ref. T. Koettig 3) Ref. K. Artoos 4) Ref. Hrivnak, Jan Luca Dassa – 17/08/2015 1/5

We have offer for pre-series. Ti Grade 6 bolts M 6 12. 25 € per bolt delivery time: 4. 25 months Luca Dassa – 17/08/2015 2/5