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Key Features of HVAF and HVOF Tungsten Carbide Coatings
The Kermetico HVAF process produces WC-based coatings with the highest fracture toughness, substantially exceeding known HVOF coatings. Since the main mechanism of wear of WC-base coatings is attributed to the material brittleness, Kermetico’s HVAF coating exhibits better wear resistance.
| WCCoCr 86/10/4 Coating Feature | Typical HVOF | Kermetico HVAF Mode | ||
| Economy | Balanced | Ultra | ||
| Deposit Efficiency (%) | 40-55 | 60-70 | 48-58 | 36-42 |
| Hardness (HV300) | 1,050-1,250 | 1,050-1,250 | 1,250-1,350 | 1,350-1,600+ |
| Apparent Metallographic Porosity | <0.8 | <0.8 | <0.5 | <0.3 |
| Bond Strength, PSI (MPa) | 12,000+ (80+) | |||
| Range of as-sprayed Roughness, µm (µ in.) | 3.5-4.5 (150-180) | 1-3.2 (40-130) | ||
