Heat treatment is a transverse application with multiple processes and is used in a variety of industries from automotive, and aeronautics to machinery and metal fabrication.
With the development of new materials and ever-increasing requirements for mechanical properties by end-users, new thermochemical applications are rapidly expanding such as:
low pressure carburizing & gas quenching,
To ensure a truly reliable and efficient process, safety and reproducibility are essential.
Air Liquide offers Nexelia™ for Thermochemical Treatment, a complete end-to-end solution that combines nitrogen and active molecules to reach the physical and chemical properties of the final metal part.
We define the results together and then commit to delivering on our performance.
The gas and associated equipment are chosen according to the different thermochemical treatment to which the part is to be subjected.
Nitrogen is a neutral gas for many metal alloys. Pure and dry nitrogen is an excellent protection atmosphere against oxidation.
Active molecules are defined depending on the heat treatment process used:
- Methanol is sprayed and cracked in the furnace to reach carbon potential needed for carburizing in the atmosphere.
- Acetylene is often used as a carburizing agent for low-pressure carburizing process.
- High-pressure nitrogen / helium are efficient for rapid cooling on gas-quenching processes.
- Ammonia is used for nitriding, carbo-nitriding or nitro-carburizing to reach the hardness requirement for the part surface.