Posted by Gordon England (126.96.36.199) on 13:42:08 28/02/05
In Reply to:Iron coating surface roughness posted by R. Pittier
: this seems to be a very helpful forum and I'd like to start a discussion on the following topics:
: - how to diminish surface roughness when plasma-spraying iron powder?
: - how to measure an iron coating on an aluminium substrate?
: I've been looking for an answer to the latter for a while... Eddy currents and ultrasonic measurements obviously don't work well because of the surface roughness (substrate thickness = 6-8 mm, coating thickness = 0.2-1 mm, roughness = 50-100 um), but I'm sure there IS a solution... I can't be the only one having this problem...
: I've been starting testings for the first question by varying the iron powder particle size and I'm waiting for the results. Is it the right parameter to work with?
Powder particle size will have probablly the largest effect on coating texture. The grit blast roughness can also be a factor on thin coatings.
Plasma spraying parameters can also effect texture, usually higher velocity produces finer texture.
Instruments based on eddy current are usually use for this type of coating/substrate combination. Magnetic type instruments if calibrated may be possible, although they are normally used for the reverse coating/substate combination.
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