Metallography for Metco 106F

[T.Ann]

We are attempting to spray Metco 106F which is new for our company. The powder is a 96% Cr2O3 powder with 3% TiO2. The metallography is showing a globular dark phase which resembles oxide? I cannot find any micrographs of what the metallography should look like and this darker phase comprises about 1% of the area. I'm trying to figure out if this is intrinsic to the coating or if it is some type of contaminant. I tried to insert my photomicrograph but cannot attach. Could someone please reply with a photo of a typical microstructure. Thank you!

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Finally got an image link.

[Vadim Verlotski]

The dark areas are no different than water or alcohol, that remained on the cross-cut surface. These areas are transparent, you can see normal coating structure underneath.

[Gordon]

Hi T.Ann

to the Surface Engineering forum.

I think these odd inclusions are fairly typical for Metco 106F coatings and are just other oxide phases.

Cheers

Gordon

[T.Ann]

No, they are not water or alcohol. They are melted and part of the coating structure.

The dark areas are no different than water or alcohol, that remained on the cross-cut surface. These areas are transparent, you can see normal coating structure underneath.

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Thank you!

Hi T.Ann

to the Surface Engineering forum.

I think these odd inclusions are fairly typical for Metco 106F coatings and are just other oxide phases.

Cheers

Gordon