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Plasma Nitriding
Plasma Nitriding is a surface-hardening heat treatment that introduces nitrogen atoms into the surface of steel to form nitrides. The purpose of nitriding is to increase the surface hardness of the steel and improve its wear and corrosion resistance properties.
All Processes carried out at 1,000° F. As can be seen from the diagram, a typical gas mixture of 30% nitrogen+70% hydrogen is used and is easily controlled in the plasma-nitriding process. The process has produced a compound zone of less than 13 µm thick.
Aluminum, chromium, molybdenum, titanium, tungsten, and vanadium easily combine with nitrogen at high temperatures to form nitrides of the respective metals. Low-carbon alloys of steel containing these metals are typically good candidates for nitriding.
Atmospheric plasma spraying APS
Atmospheric Plasma Spray (APS) Systems are the most versatile and flexible thermal spray process due to its ability to spray a wide range of materials such as most metals, ceramics and alloys onto many different substrate materials such as plastics, glass, metals, ceramics and composite materials. Also, a broad range of powder particle sizes can be used. Benefits of APS include resistance against heat, oxidation and wear, corrosion protection, clearance control for abrasives and abradables, temperature management as well as electrical resistivity and conductivity. Thus APS can be used for a wide range of applications across industries
Typical coatings
Ceramics .
Carbides & Cermets .
Iron, Nickel & Cobalt based alloys .
Main applications
Wear resistance, Sliding, Abrasive, Erosion, etc .
Corrosion resistance .
Thermal Barrier Coatings (TBC) on turbine components of any size .
Hard-facing coatings for better fretting resistance on combustion parts .
HVOF
HVOF is a thermal spray system utilizing the combustion of gases, such as Hydrogen or a liquid fuel such as ethanol or kerosene. Fuel and oxygen mix and atomize within the combustion area under conditions that monitor the correct combustion mode and pressure
The process creates a very high velocity which is used to propel the particles at near-supersonic speeds before impact onto the substrate. One of the basic rules of spraying is that high combustion pressure = high gas velocity, high particle velocity and resulting high coating quality
Typical coatings
Nickel & Cobalt-based alloys, Stellite .
Triballoy, Inconel .
Iron-based alloys, AISI 316L, etc .
Carbides & Cermets .
MCrAlY .
Main applications
Wear resistance Sliding, Abrasive, Erosion, etc .
Chemical resistance .
High-Temperature applications .
