Gordon England Surface Engineering Forum



Stripes in plasma sprayed cobalt alloys


Posted by Benjamin Russell on April 25, 2003 at 08:19:28:

I am working with some plasma sprayed CoCrNiW coatings and am puzzled by some of the oxide formations i am seeing. Typically these are stripes all in the same direction and with consitent angles. Also i have seen some V shaped oxide clusters, generally originating at a point in the substrate and extending though the whole thickness of the coating. One theory is that turbulence effects resulting from defects (eg unmelted particles) cause vortecies in which oxidised fines accumilate and form these structure. I would appriciate any liturature on the subject and any other suggested reasons for this phenomenom.


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