Thermal Spray Technology
Auxiliary Equipments
Consumables
 
 
 
Untitled Document
The HVOF (High Velocity Oxygen Fuel) Thermal Spray Process is basically the same as the combustion powder spray process (LVOF) except that this process has been developed to produce extremely high spray velocity. There are a number of HVOF guns which use different methods to achieve high velocity spraying. One method is basically a high pressure water cooled HVOF combustion chamber and long nozzle. Fuel (kerosene, acetylene, propylene and hydrogen) and oxygen are fed into the chamber, combustion produces a hot high pressure flame which is forced down a nozzle increasing its velocity. Powder may be fed axially into the HVOF combustion chamber under high pressure or fed through the side of Laval type nozzle where the pressure is lower. Another method uses a simpler system of a high pressure combustion nozzle and air cap. Fuel gas (propane, propylene or hydrogen) and oxygen are supplied at high pressure, combustion occurs outside the nozzle but within an air cap supplied with compressed air. The compressed air pinches and accelerates the flame and acts as a coolant for the HVOF gun. Powder is fed at high pressure axially from the centre of the nozzle.
Resulting Advantages :
  • Process of choice for high quality wear resistant coatings
  • Highest density thermal spray coatings
  • Outstanding adhesion
  • Extremely High Bond Strength
  • Uniform Coating
  • Excellent Wear Resistance (Carbides)
  • Excellent Corrosion Resistance
  • Low Application Temperature
  • Low Residual Stresses
  • Higher Impact Resistance
  • Neutral to Compressive Residual Stress (Greater thickness capability)
  • Less Chipping & Peeling vs. other Thermal Spray Processes
 
Name : LIQUID FUEL (SPARE PART)
Type : POWDER
Model No. : ST-4000
Description : Liquid oxy fuel high velocity gun parts
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Name : Multi Jet
Type : Powder and Wire (Push System)
Model No. : HVOF/LVOF
Description :  
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Name : LVOF/HVOF Conversion Kit
Type : For Powder & Wire
Model No. : Multi Jet, Push System
Description : Conversion Kit For 5PM-II / 6 PM-II / MDJ / HP
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Name : FLAME SPRAY (Spare Part)
Type : POWDER GUN HIGH VELOCITY
Model No. : TOP GUN
Description : HVOF
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Resulting Advantages :
  • Process of choice for high quality wear resistant coatings
  • Highest density thermal spray coatings
  • Outstanding adhesion
  • Extremely High Bond Strength
  • Uniform Coating
  • Excellent Wear Resistance (Carbides)
  • Excellent Corrosion Resistance
  • Low Application Temperature
  • Low Residual Stresses
  • Higher Impact Resistance
  • Neutral to Compressive Residual Stress (Greater thickness capability)
  • Less Chipping & Peeling vs. other Thermal Spray Processes.
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