Galling with various metal on metal combinations
Galling with various metal on metal combinations
(OP)
I have an application where a flat, .75 diameter surface made of 303S stainless bar is being slid along 7075-T6 AL surface with approximately 3.6 pounds of force. The problem is that the 7075-T6 is galling. Can anyone recommend two metals that would work well together in this situation without lubrication? Or possibly a metal/poly combination.
Or even a web site or book that I might reference to find metal on metal recomendations.
Or even a web site or book that I might reference to find metal on metal recomendations.





RE: Galling with various metal on metal combinations
RE: Galling with various metal on metal combinations
www.magnaplate.com
Best Regards
RE: Galling with various metal on metal combinations
Alternatively, you could try Al-12 wt.%Si alloy instead of 7075-T6, if cast material is okay.
If you harden the steel or a hardened steel surface is used, generally Al alloy wear decreases (my Ph D thesis).
If you can try another combinations, try steel on steel with approriate hardness levels (i.e composition and heat treatment). Refer to any good book on wear or wear control handbook.
There are numerous possible combinations possible - metal/metal, metal/polymer, polymer/polymer, etc., apart from ceramic and composite materials, if you design allows. People who read these postings can give some guidance depending the info you supply.
Let me know if you need more info.
RE: Galling with various metal on metal combinations
Can you tolerate any particles from wear?
Must the surfaces be clean; can you put on a coating?
Is lubrication allowed?
What is the temperature range?
What is the speed range?
What is your budget?
-The load is low enough to use PTFE (Teflon) or a similar polymer.
-UHMW-PE is more afforable and has the same coefficient of friction as PTFE when wet, slightly higher when dry.
-Drill and tap the end of the stainless part, and install a nylon-tipped setscrew facing the aluminum.
-Dow Corning makes a MoS2 solid lubricant spray that could be applied to one of the surfaces. Least expensive approach (~$15) if it would work for you.
-Electroless Nickel plating on the aluminum could be hardened to ~Rc60.
-Hard anodizing the 7075 aluminum is difficult and would wear the 303SS.
RE: Galling with various metal on metal combinations
Dr.R.Sivakumar