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HVAF Spray Technique

February 1, 2024

GS Paper III Science and Technology

Context: 

Indian scientists claim to have discovered  High Velocity Air Fuel (HVAF) Spray Technique as an alternative to hard chrome plating.

Hard Composite Coatings Through HVAF Spray Technique

HVAF Spray

  • Scientists from International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI) carried out synthesis of thin hard coatings of a composite alloy of Tungsten, cobalt, and chromium (WC-10Co-4Cr) by high velocity air fuel spraying. 
  • Thin coatings were deposited with torches with different capacities and by employing different nozzle sizes.

About HVAF Spray Technique

  • HVAF coating technology involves the combustion of propane within a compressed air stream, generating a consistently high-velocity jet. 
    • In this process, material is introduced into the air-fuel stream, propelling coating particles towards the target component.
Chrome Plating 

  • It is a finishing method where chromium is applied onto the surface of a metal workpiece or object.
  • Application of Chrome plating : Due to Durability, corrosion resistance, and aesthetics value it is used
    • In the automotive industry, decorative chromium plating on elements of both cars and motorcycles; such as rims, engine components, exhausts etc.
    • It is also a great fit for kitchen utensil design requirements. 
    • In premium tools and taps. 

Potential Benefits of HVAF Spraying Thin Coating technique

  • Improve Coating Quality : It operates at low temperatures and high particle velocities, using finer-sized powders.  
  • Economical benefits: As it reduces the need for grinding processes.
  • Maintain  better wear resistance than hard chrome plating
  • A Better alternative for heavy-load applications like hydraulic shafts and valves.

News Source: PIB 

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