High Velocity Oxy Fuel (HVOF) devices are a subset of flame spray. There are two distinct differences between conventional flame spray and HVOF. HVOF utilizes confined combustion and an extended nozzle to heat and accelerate the powdered coating material. Typical HVOF devices operate at hypersonic gas velocities, i.e. greater than MACH 5. The extreme velocities provide kinetic energy which help produce coatings that are very dense and very well adhered in the as-sprayed condition.
BENEFITS
TYPICAL HVOF APPLICATIONS :-
| PARAMETER | HVOF (OXY FUEL) | HVOLF (LIQUID FUEL) |
|---|---|---|
| SPRAY GUN | PDJ-2700 | PJP-5000 |
| CONTROL CONSOLE | Flowmeter/Mass Flow Controlled | Mass Flow Controlled |
| POWDER HOPPER | 700/3350/5000/7800 CC | 700/3350/5000/7800 CC |
| FUEL | LPG/Propylene/Hydrogen | Jet A-1 Fuel |
| CARRIER GAS | Nitrogen/Argon | Nitrogen/Argon |
| POWDERS | WC, Cr3C2 Based Alloys | WC, Cr3C2 Based Alloys |
| MOUNTING | Manual/Robotic | Robotic |
| EXTENSION NOZZLE | Available | NA |
| COOLING | Air/Water Cooling | Water Cooling |
| COATING PROPERTIES | Better | Excellent |
| SPRAY RATE | 2-3 Kg/hr | 8-9 Kg/hr |
| GAS VELOCITIES | 1800m/sec | 2100m/sec |
| COMBUSTION PRESSURE | 75-80 PSI | 120-280 PSI |