I'm attempting to tape cast porous ceramics for use in SOFCs. To the ceramic powder, pore former, ethanol, and dispersant solution mixture, I added binders in solid form and ball milled. I deaired in a vacuum desiccator for 30 minutes prior to tape casting, but the slurry is still bubbling up ( as shown in the picture). If I extend the time, it ultimately evaporates as I use ethanol solvent and it gets dried up and becomes unsuitable for casting. After deairing for 30 minutes, I tried tape casting, but the dried sheets formed bubbles.
Could someone kindly suggest me on avoiding bubbles to get flat, uniform sheets?
Thank you
Better use some deairing equipment which rotates at high RPM (> 1000) for 15-30 min.
You can try to add a suitable antifoaming agent to your tape casting slurry.
Hakan Ünsal and Abhinay Sreeram : Thank you so much for your suggestions
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