Optimising Nitriding using Gas Analysis
March 2008
Nitriding is a metal treatment used for hardening the outer layer of metal pieces that are to be exposed to corrosive processes or harsh atmospheres. The process is widely used in automotive, mechanical and aeronautical engineering, particularly steel and aluminium extrusions. The process relies on atomic nitrogen which is present briefly as ammonia dissociates into hydrogen and nitrogen. There are five parameters which need to be controlled to optimise the nitriding: pressure, flow, temperature, time and degree of dissociation. The first four are relatively straightforward but the dissociated ammonia requires a gas analysis technique.
The Hitech K1550R is a katharometer (thermal conductivity) based analyser perfect for measuring binary gas mixtures. With dedicated software Hitech manufacture a version which displays directly in % dissociation of ammonia. A carefully designed sample system is necessary to deliver the process gas for accurate, safe analysis.
Customers report greater repeatability and less damage to pieces being treated. The resulting efficiencies in the process still result in a net saving once the cost of the analyser is taken into account.
Hitech Instruments have been specialising in process gas analysers for over 25 years and take great pride in the level of technical support they provide. New distributor enquiries are always welcomed.
For further information please contact us by your preferred method,
Phone: +44 1582 435600
Email: hitechsales@cooperindustries.com
