An aqueous solution containing zirconium oxy-nitrate and yttrium
nitrate saltswere used as precursor. The amounts of these salts in the solution
corresponded in stoichiometry to 93 wt.% ZrO2 and 7 wt.% Y2O3
(7YSZ). The substrates were stainless steel, type AISI 420, disks with
diameter of 25 mmand thickness of 10 mm. The specimens after roughening
by grit blasting and cleaning were coated with Ni22Cr10Al1.0Y
alloy (Amdry 962) as bond coat by atmospheric plasma spray method
(Sulzer-Metco F4 gun) to reach the thickness of 80–100 μm. Spray parameters
are shown in Table 1. Glass specimens 2.5×2.5 cm were used
for single-line scan sampling.