Posted by Gordon England (62.252.0.12) on 18:01:49 13/01/06
In Reply to: Re: What is etchant for Aumina,Titania and Zirconia posted by vivek
There are a few etching techniques for oxide ceramics, but I
don't know if they will work well with your coating. Removal of
the substrate will probably be required. Also, coating porosity
will cause problems.
Thermal etching in air - probably not practical and may change
coating.
Molten potassium hydrogen fluoride in Pt crucible.
Phosphoric acid plus 15% water boiling for 5 minutes to
hours.
Sulphuric acid plus 50% water boiling for 1 to 5 minutes.
Hydrofluoric acid mixes may be worth trying.
I have not tried any of these techniques on ceramic coatings, so I
can not really advise on what you might see. I would suggest before
you use etchants, to first gain as much information as you can by
viewing in the as-polished condition, also the use of controlled
relief polishing can be very revealing. I think you will need to
experiment, good luck.
Regards Gordon
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