Table 2: Parameters of air plasma spraying (APS) method.

ParameterNiCrAlYYSZGranulated nano-Al2O3

Current (A)450550500
Voltage (V)507050
Primary gas, Ar (L/min)853885
Secondary gas, H2 (L/min)151715
Powder feed rate (g/min)153525
Spray distance (cm)157.510