SiO2-ZrO2 reaction at 1100¦C

[siegenerbuerger]

Dear fellows,

I have an alloy which is protected by an outer SiO2-scale at high temperatures. The scale forms when you expose the alloy to lets say 1100°C because alloy substrate evaporates leavin SiO2 behind (actually substrate is Mo). Since the alloy also contains ZrO2, particles of ZrO2 can be found within the SiO2-scale.
I did some experimental measuring such as Raman spectroscopy which gives me (only qualitatively) information about ZrSiO4 being present, so obviously SiO2 and ZrO2 reacted. Problem is, my measure is not really space-resolved so it can basically be "everywhere" in the scale.
Do you think ZrO2-particles partly transform into ZrSiO4 or will ZrSiO4 be soluble also in the SiO2 (such as B2O3)?
I been dealing with this problem for a long time now, hopefully some specialist has one nice idea? Thanks guys.

 

[unclesyd]

e dound out that when working with high temperature coatings all manner of different compounds were formed by solid state chemisty. Some easily identified based on previous work while many went udefined.
You will notice that most of the ads for Zirconium oxide mention silica free.

The first link has several Si ZR compounds.
The other 2, ZYP and Zircoa are usually a good source of information.

http://lb.chemie.uni-hamburg.de/static/CN/2_Z_zirco.php?content=170/Oz9iJmNo

http://www.zircoa.com/index.html

http://www.zypcoatings.com/ProductPages/ZirconiumOxide.htm