Amorphous Metallic Glass Coatings: High Velocity Thermal Sprayed Dense, Wear-Resistant Layers

 

Kermetico HVAF equipment efficiently deposits hard, dense and non-oxidized amorphous metal coatings. The low temperature of the HVAF process, high and uniform particle velocity results in high coating quality and high deposition efficiency.

Below you can find the properties of Nanosteel SHS-7574 deposited by Kermetico HVAF AK equipment.

Amorphous Steel Feedstock Properties

SHS 7574 HVOF is an iron-based amorphous steel alloy with a nanoscale microstructure that features extreme corrosion resistance in high chlorine, salt fog, concentrated salts and seawater environments. SHS 7574 also provides a metallic glass coating alternative to electrolytic hard chromium.

Pre-alloyed powder, gas-atomized.

Nominal compositionwt.%
Chromium < 25%
Molybdenum < 20%
Tungsten < 10%
Boron < 5%
Manganese < 5%
Carbon < 3%
Silicon < 2%
Iron Balance
The Properties Of HVAF SHS-7574 Amorphous Metallic Glass Coatings
  • Outstanding corrosion resistance in high chlorine, salt fog, concentrated salt and seawater environments.
  • Can be finished to very high surface specifications for use as a replacement for hard electrolytic chrome coatings.
  • High bond strength, low porosity and high impact resistance.
  • Corrosion resistance is superior to crystalline austenitic stainless steel and nickel-based superalloys.
FeatureS.I. UnitsU.S. Units
Apparent metallographic porosity <1.0%
Bond strength to carbon steel 70+MPa @500µm thickness 10,000+ PSI @0.020” thickness
Hardness 65 HRC
Maximum coating thickness (as-sprayed) 1 mm 0.04”
Maximum working temperature 700oC 1300oF
Typical Applications Of HVAF Amorphous Metallic Glass Coatings

Features:

  • Grindable with silicon carbide wheels
  • Excellent resistance to abrasive wear and erosion
  • Low coefficient of friction
  • Fair impact resistance

Usually applied with Kermetico HVAF spray & blast technology.

Protection against abrasive wear, erosion and sliding wear, as well as general corrosion:

  • sealing rings
  • wear plates
  • hydraulic cylinders
  • clutch hubs
  • pulverized coal and fluidized bed boiler waterwall tubing

We do not recommend the coating for parts exposed to fatigue.

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