You mean molybdenum layers produced by wire flame spraying or plasma spraying? These layers are normally applied to carbon steels and serve to protect wear in trybological pairs. Most common application: Replacement for hard chrome for piston rings. Some literature on Mo-layers can be found in combination with piston rings.

Mechanical properties of sprayed layers are independent of the substrate material. Significantly more important are the influence of spraying methods and spraying parameters. Virtually all molybdenum layers are porous and are significantly weaker than compact molybdenum.

http://link.springer.com/article/10.1361/10599630523827

http://www.imoa.info/download_files/molyreview/excerpts/14-2/Molybdenum_metal_coatings.pdf

http://www.asminternational.org/documents/17679604/17683439/AcceptedPractices5.pdf/022264f0-d9fd-4523-a189-76fb80c664b4

@Vadim Verlotski Sir...

Firstly , thank you for such nice and helpful reply.

are there any possibilities to coat Mo on stainless steel by using SLM (Selective Laser Melting)? if yes, then wat will be d new advantages and application for the same???

Hi Amit,

Unfortunately, it is impossible to apply a molybdenum layer on the steel by means of an welding (also selective laser melting). It is because the thermal expansion coefficients of molybdenum and all of steels (especially austenitic stainless steels) differ greatly from each other. When the melt cools, very high stresses are created which lead to crack formation.

In thermal spraying, materials with very different thermal expansion coefficients can be combined. There are molybdenum layers on different metals. However, this applies only to applications at room temperature. For high-temperature applications, coefficients of thermal expansion must be close to each other.

Vadim Sir, 

what is the concept behind, that how they can be combined by thermal spray coating???

During thermal spraying, the substrate remains cold (

Sir,

Are there any other techniques to coat Mo on SS??? such as from PBF (Powder Bed Fusion) or any else?

I know only molybdenum layers produced by thermal spraying. It can also work with PVD ( physical vapour deposition) for thin Mo layers.