Coating to increase friction on stainless steel 3

[nickjk]

I am looking for a high friction coating to be used on stainless steel (this is opposite for what most coatings are used for and I am having a hard time finding info.)

The requirements are as follows:

Coating to be applicable and applied to #17-4 stainless steel shaft.

The shaft travels through a 440C ground I.D. stainless steel sleeve.

From testing data I found the current coeficient of friction between the sleeve and shaft to be .15 when a calculated contact pressure of 18900 lbs/in sq. is applied to the shaft by squeezing the sleeve.

Because of limited space requirements I need to raise the coeficient to a minimum of .20 perfered .30 at 18900 lbs/in sq of contact pressure. I cannot raise the contact pressure.

Purpose of friction is to lock shaft to sleeve and prevent a vertical movement when sleeve is squeezed.

Note: Clearance between shaft and sleeve when sleeve is released is .0007 inch total. What would be the thickness of the coating and its abbility to hold tight tolerance.

The Load application will be applied approx. 250,000 cycles per lifetime.

Any help and sources would greatly be appreciated.

Thank You,

Nick

 

[nickjk]

Desertfox

Thank you for your response, I have reviewed these links during my research and I will review them closely again.

Mike Halloran and others may be right about using a off the shelf solution and that may be the way I end up going but at this point I have an idea that makes sense to me and I would truly like to know if I am on the right track. I can test my theory at very little expense and see if there is any change at all. If there is an improvement then I will dig deeper.(baby steps) If I fail, then I have leaned something I would not have learned if I did not try.

Thank you all

Nickjk

 

[desertfox]

Hi nickjk

Best of luck

regards

desertfox