Effect of Plasma Pretreatment on Thermal Durability of Thermal Barrier Coatings in Cyclic Thermal Exposure

Table 1

Coating parameters for preparing the bond and top coats.

Parameters	Bond coat		Top coat (APS)
	APS	HVOF
Feedstock species	AMDRY 962	AMDRY 997	C-NS/NS
Feed rate (g/min)	90	40	100
Gun to working distance (mm)	180	250	150
Gun moving speed (mm/s)	500	700	500
Current (A)	450	—	540
Voltage (V)	90	—	99
Primary and secondary gas (ℓ/min); (Ar/He)-APS, (Air/O2/H2)-HVOF	30/20	184/98/453	15/5
Step distance (mm)	8	8	5