Thermal Spray Coatings: HVOF
Titanium CP HVOF to WC CoCr 86 10 4
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 | Titanium CP HVOF | Biomedical; corrosion; chemical processing; low density structural applications; Ti implant bond coats | 83 | 55 | 68 | 72 | 50 | 62 | 480 | 300 | 380 | metallic | 600 | 3 | 0.5 | 1.5 | 2.5 | 0.5 | 1.5 | 7 | 3.5 | 5 | 500 | 100 | medium |
| HVOF | WC-10Co-4Cr | Corrosion + wear; seawater environments; chemical processing; offshore; superior to WC-12Co in corrosive media | 90 | 55 | 75 | 65 | 40 | 55 | 1,500 | 1,100 | 1,300 | carbide cermet | 480 | 1 | 0.1 | 0.5 | 1 | 0.1 | 0.5 | 6 | 3 | 4.5 | 500 | 100 | low |
| HVOF | WC-12Co | Wear resistance; erosion; sliding abrasion; pump shafts; hydraulic rods; landing gear | 83 | 55 | 70 | 65 | 40 | 55 | 1,400 | 1,000 | 1,200 | carbide cermet | 500 | 1 | 0.1 | 0.5 | 1 | 0.1 | 0.5 | 6 | 3 | 4.5 | 500 | 100 | low |
| HVOF | WC-17Co | Higher Co binder for toughness; impact + wear; mining equipment; ball mill components | 80 | 50 | 65 | 62 | 40 | 52 | 1,300 | 900 | 1,100 | carbide cermet | 500 | 1.5 | 0.2 | 0.7 | 1.5 | 0.2 | 0.8 | 7 | 3.5 | 5 | 500 | 100 | low |
| HVOF | WC CoCr 86 10 4 | WC-CoCr for corrosion+wear; HVOF preferred grade for seawater; oil/gas; down-hole tools; pump components | 90 | 60 | 75 | 65 | 42 | 55 | 1,450 | 1,050 | 1,250 | carbide cermet | 480 | 0.8 | 0.1 | 0.4 | 0.8 | 0.1 | 0.4 | 6 | 3 | 4.5 | 500 | 100 | low |
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