coating for steels

[racorva]

Dear All,

I wonder if anyone can help me.

I have a problem of wear between two sliding parts made of steel. The first part is a pin made of 15-5 PH nitrided stainless steel and the second one, the pin housing, made of Maraging steel manganese phosphated. The pin slides periodically inside the housing. We have calculated about 20.000 sliding cycles along the whole life of the parts.

Since during its sliding movement the pin applies also an huge compressive stress (about 2000 MPa), the phosphated surface of the housing is damaged very quickly.

Can anyone suggest me a useful coating able to resist this big contact pressure and having a very low friction coefficient?

Many thanks
Raffaele Corvaglia

 

[JTreglio]

Sputter-deposited molybdenum disulfide or tungsten disulfide should do the job. Both can handle -- indeed, work better -- under high loads. The tungsten version handles higher loads and temperatures, the molybdenum version yields a lower friction coefficient. Both can be obtained commercially.

Jim Treglio