Oxidation resistant coatings for refractory metal cermets
Refractory metal cermets have attractive mechanical properties for high temperature applications, but exhibit poor resistance to oxidation attack. A two-step coating process has been developed in order to provide an effective high temperature oxidation resistance. W-HfN and Mo-ZrN cermet samples were initially coated with a layer of Mo through a Mo(CO) 6 decomposition reaction. The second step involved a co-deposition of B and Si by a pack cementation treatment. The resultant aluminoborosilicate coating exhibits good adherence to the cermet samples. Oxidation exposure at temperatures up to 1400°C demonstrated minimal mass change and an unaltered cermet microstructure.
Aluminoborosilicate coating, Cermet, Oxidation, Pack cementation
Perepezko, J. H., J. M. Bero, R. Sakidja, I. G. Talmy, and J. Zaykoski. "Oxidation resistant coatings for refractory metal cermets." Surface and Coatings Technology 206, no. 19-20 (2012): 3816-3822.
Surface and Coatings Technology