Thermal Spray Coatings: HVOF
Properties of thermally sprayed coatings by spray process and coating material. Processes: HVOF (high velocity oxy-fuel), APS (atmospheric plasma spray), wire arc spray, detonation gun, and cold spray. Materials: WC-Co and Cr3C2-NiCr carbide cermets, Al2O3/Al2O3-TiO2/Cr2O3/ZrO2-YSZ oxide ceramics, MCrAlY bond coats, NiCr, Stellite 6, 316L stainless, copper, zinc, aluminum, and specialty alloys. Properties: hardness (HV), bond strength (MPa), porosity (%), oxide content (%), surface roughness Ra (um), deposition efficiency (%), thickness range, max service temperature, wear rate, and application guidance. Per ASM Handbook Vol 5A and Oerlikon Metco/Praxair/Höganäs product data.
| spray process | coating material | application | bond strength mpa max (MPa) | bond strength mpa min (MPa) | bond strength mpa typical (MPa) | deposition efficiency pct max | deposition efficiency pct min | deposition efficiency pct typical (%) | hardness hv max (HV) | hardness hv min (HV) | hardness hv typical (HV) | material category | max service temp c (degC) | oxide content pct max | oxide content pct min | oxide content pct typical (%) | porosity pct max (%) | porosity pct min (%) | porosity pct typical (%) | surface roughness ra um max | surface roughness ra um min | surface roughness ra um typical (um) | thickness range um max (um) | thickness range um min (um) | wear rate relative |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HVOF | 316L_SS | Corrosion protection; repair; dimensional restoration; food industry; pharmaceutical equipment; chemical tanks | 70 | 40 | 55 | 68 | 45 | 58 | 300 | 200 | 250 | metallic | 870 | 6 | 1 | 3 | 3 | 0.5 | 1.5 | 8 | 4 | 5.5 | 600 | 100 | medium |
| HVOF | Amorphous_Fe_based | Fe-based metallic glass; exceptional hardness+corrosion; HVOF amorphous; cavitation; slurry erosion; Navy surface ship | 85 | 55 | 70 | 62 | 40 | 52 | 1,100 | 800 | 950 | metallic | 450 | 4 | 1 | 2.5 | 2.5 | 0.5 | 1.5 | 7 | 3.5 | 5 | 500 | 100 | low |
| HVOF | Copper_99 | Electrical conductivity coatings; heat sinks; bus bars; electromagnetic shielding; induction heating susceptors | 65 | 35 | 50 | 80 | 60 | 70 | 130 | 80 | 100 | metallic | 350 | 3 | 0.5 | 1.5 | 3 | 0.5 | 1.5 | 8 | 4 | 6 | 600 | 100 | medium |
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