Posted by Gordon England (62.252.0.12) on 18:06:18 23/03/06
In Reply to: Re: Arc sprayed Al posted by Hong
Hi Hong
I have had cause to evaluate this in these coatings. Oxide
inclusions don't appear as obvious as in nickel and iron based
coatings, so are not as easy to evaluate by metallography.
What is your reason for this info, just interest or is your coating
function dependent on oxide content?
To reduce oxide content you could either spray with lower atomising
air pressure producing larger particles (less surface area,
less oxidation, courser coating)or use an inert
(nitrogen/argon) atomising gas which would more
effective.
P.S. SiC or diamond grinding usually recommended.
Regards Gordon
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