RE: YSZ Patching
I kind of disagree with SREENIVAS.
If the surface of TBC was not polished and surface is clean, you can patch TBC on small area. I did same test with microstructure and tensile test, all pass our Spec.
Yes, if the part was laying on floor too long time let say more than 48 hours and the surface was contaminated, you can't patch TBC.
Believe it or not, lot of coating shop doing it. You don't want strip all TBC and coat it again because small area coating thickness is thin. Especially when you found out, you already coat 20 parts.
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