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The properties have been investigated in a research program at Toshiba Corporation (Itoh, Saitoh, and Tamura, 2000), and compared with the vacuum plasma spray (VPS) method.
The VPS coating requires preheating to 843 K, and the spraying distance is 270 mm in an argon gas atmosphere maintained at 6 kPa.
Method Bending strength (Gpa) Young's modulus (Gpa) Poisson's ratio Vickers hardness (HV300) CoCrAlY HVOF 2.01 155 0.30 719 CoCrAlY VPS 1.85 208 0.26 456 NiCoCrAlY HVOF 1.63 138 0.33 475 NiCoCrAlY VPS 1.43 163 0.29 387
The Young's modulus of the coating with the HVOF method is inferior by 25 to 30 percent when compared with the VPS procedure.
This effect causes the residual stresses in HVOF coatings to be lower than in the VPS method.
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