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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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