Amorphous Metallic Glass


Endurance brings you economical environment-friendly Fe-based coatings for corrosive environments which can effectively replace Co-based coatings and hazardous electrolytic, chrome plating. With HVAF, these metallic glass iron-based coatings are known to drastically slow down the corrosion process.

Characteristics of Amorphous Fe-based HVAF coatings

  • In-flight temperature results in dense coating layers with considerably reduced defects and improved corrosion resistance.
  • The endurance shield effect of Fe-based coatings imparts corrosion resistance in concentrated seawater environments.
  • Grindable by Silicon Carbide wheels

Explore thermal spray HVAF amorphous metallic glass iron-based coatings at our spray shop in Mumbai. Contact Us

HVOF thermal spraying is one of the most widely used processes for depositing coatings such as metals, cermet, ceramics, and metallic glasses, which seems more feasible due to its high cooling rates of 107 – 1010 K/s. However, in comparison with the HVOF process, the HVAF system which produces a mixture of compressed air and fuel gas in the combustion chamber has a lower spraying temperature (1600k) than HVOF (1900k) process. So, the chemical uniformity generated by controlled oxidation in the coating by HVAF can be improved. Moreover, the high particle velocity, typically over 700 m/s, of the HVAF process has been reported to provide lower porosity and improved adhesion strength in the coating than in the HVOF process. Furthermore, the use of air instead of oxygen for combustion by HVAF is expected to lower the cost of spraying and promote its competitiveness over other processes.

  • Fe- based metallic glass coatings deposited by ac-HVAF have much better corrosion resistance than stainless steel, which is mainly dependent on their amorphous structure and chemical composition. Both amorphous coating and stainless steel have the Cr element, which is the element of self- passivation. For amorphous coating, the introduction of the Cr element contributes to the formation of a strong passive film of hydrated chromium oxyhydroxide. This process effectively inhibits the active dissolution of the amorphous phase and enhances corrosion resistance.

Amorphous Metallic Glass Feedstock Composition

Nominal composition Wt.%
Chromium <25%
Molybdenum <20%
Tungsten <10%
Boron <5%
Manganese <5%
carbon <3%
Silicon <2%
Iron Balance

Micrograph of Amorphous Metallic Glass Coating

Typical Applications of Iron-Based Coatings

  • Hydraulic rods
  • Boiler tubes
  • Downhole oil drilling tools
  • Pump components: impellers, casings, shafts


Feature S.I Units
Apparent metal logographic prosity <1.0%
Bond strength to carbon steel 70+MPa@500um Thk.
Hardness 65HRC
Max. coating Thk. (as-sprayed) 1mm
Max. working Temp. 700°C
Amorphous Fe Based coating on Impeller In Sea Water Environment.
Fe Based Coatings on Shafts used In the Marine Industry Vertical.