Re: What is etchant for Aumina,Titania and Zirconia

Posted by Gordon England ( 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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