Friction coating with good durability under high pressure?

[RichLeimbach]

Trying to replace the grease in part of our system with a dry film lubricant. The application is for a ball bearing (chrome steel) running in a helical (Rc 60 D2 steel) track. The high pressure on the ball (~100ksi) and the twisting, scuffing motion at the contact patch causes the system to fail from an adhesive wear condition after only 3K cycles if run dry.
The current grease is a high-moly grease with 30% molybdenum content. It works well for over 1 million cycles, but is dirty and tends to contaminate other parts of the system. We would like ot replace it with a dry film lubricant of some type.
We've tried a number of options already TiN, WS2, MS2, but so far, the best we have tested has been Xylan (it got ~90K cycles before failure). Unfortunately we need life in excess of 250K cycles.
Any suggestions on coatings that might help get us to our bogey? All help is appreciated.

- Rich

 

[ivymike]

it might be worth sending an email to Argonne Nat'l Lab:

http://www.techtransfer.anl.gov/working/pdfs/Profile Carbon Films3-17-03.pdf

http://www.eurekalert.org/features/doe/2002-05/dnl-ncc062602.php

 

[unclesyd]

Here are a few people I have worked with over the years and have gotten good service and results. I would query each and see what they have to offer.

http://www.microsurfacecorp.com/Index.htm

Make several good coating especially their WS2

http://www.morganadvancedceramics.com/news/everlube.htm

Handles the Everlube products

http://www.tiodize.com/main.html

Tiodize Coatings

http://www.orioncoat.com/list.html

Coat just about anything with anything


Here is one that is pushing ZrN as wear coating.

 

[johnchrc]

Try Flourolon 325/60 offered by Impreglon.

SW Inpreglon Houston offeres this coating. Excellent adhesion, very low friction coef. and durable. Great with high bearing loads.

I have had excellent results in simlar applications.

Let me know if ou try and it works