: HVOF

HVOF spraying allows the deposit of carbides, metal oxides, and metal alloys at supersonic speed (Mach 6). The resulting deposits are very dense and have remarkable hardness up to 1100 HV, as well as exceptional adhesion.
Tungsten carbides are used in applications where abrasion and mechanical shock are particularly severe. Chromium carbides, on the other hand, are more often used to combat corrosion. For certain applications where corrosion and abrasion are present, MNI deposits both carbides in a bi-layer manner.
HVOF (High Velocity Oxy-Fuel or Hypersonic Flame Spraying) thermal spraying is achieved by the combustion of a gaseous fuel and oxygen.
The gases are burned and accelerated to reach hypersonic speed (between Mach 5.2 and 6.4) at the nozzle outlet. Powder is then introduced into the torch through a converging nozzle. This molten or semi-molten powder is accelerated to supersonic speed (between Mach 1 and 2.1).
The particles projected onto the substrate are flattened and form the coating as they cool and solidify.
The high particle speed, uniform heating, and short flame passage time contribute to the formation of a coating with high density (porosity < 2%), excellent adhesion (80 MPa), and no substrate deformation.
HVOF spraying allows the deposit of carbides, metal oxides, and metal alloys at supersonic speed (Mach 6). The resulting deposits are very dense and have remarkable hardness up to 1100 HV, as well as exceptional adhesion.
Tungsten carbides are used in applications where abrasion and mechanical shock are particularly severe. Chromium carbides, on the other hand, are more often used to combat corrosion. For certain applications where corrosion and abrasion are present, MNI deposits both carbides in a bi-layer manner.
HVOF (High Velocity Oxy-Fuel or Hypersonic Flame Spraying) thermal spraying is achieved by the combustion of a gaseous fuel and oxygen.
The gases are burned and accelerated to reach hypersonic speed (between Mach 5.2 and 6.4) at the nozzle outlet. Powder is then introduced into the torch through a converging nozzle. This molten or semi-molten powder is accelerated to supersonic speed (between Mach 1 and 2.1).
The particles projected onto the substrate are flattened and form the coating as they cool and solidify.
The high particle speed, uniform heating, and short flame passage time contribute to the formation of a coating with high density (porosity < 2%), excellent adhesion (80 MPa), and no substrate deformation.