Gordon England Surface Engineering Forum

Re: Heat transfer of Mo-coated surface

Posted by Gordon England on December 12, 2003 at 16:57:53:

In Reply to: Heat transfer of Mo-coated surface posted by Andreas Fecht on December 12, 2003 at 14:56:15:

: We are investigating Mo-coating on steel shaft bearing journal. Does anybody know the heat transfer coefficient of Mo-coating on steel. We could only find heat transfer values for Mo and for steel but not of metal sprayed components. Does the Mo-coating act as a thermal barrier.

: Andreas Fecht

Hi Andreas

The thermal conductivity of a thermal spray molybdenum coating will depend on the quality of the coating in terms of density and oxide content. The value for a coating will be lower than the equivalent bulk material (about 145 W/m/K) due to porosity, particle boundaries and oxide content I can't find any actual values for molybdenum coatings but I doubt whether a good molybdenum coating would produce any thermal barrier effects on steel, unless the coating has extremely high porosity or contains flaws.

Regards Gordon

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