• Winter, K.-M.
• Hoja, Stefanie
• Klümper-Westkamp, H.

Abstract

<jats:title>Abstract</jats:title><jats:p><jats:bold>The process of gaseous nitriding</jats:bold> is considered to be fully controllable by temperature and the nitriding potential. Most of the commercially used control systems are based on the Lehrer Diagram showing the relation between nitrogen-iron phases, temperature and the partial pressure ratio of ammonia and hydrogen. This is also reflected in the measuring equipment used to determine the nitriding potential. Lehrer's phase diagram was created out of the reactions between set gas mixtures of ammonia and hydrogen and pure iron powder. In industrial nitriding cycles, dealing with real materials and real parts, the results often do not match the expectations. This paper will try to explain the parameters that have to be taken into account and how to measure, set and control the nitriding and carburizing potentials by giving an overview of the available equipment.</jats:p>

Topics

• impedance spectroscopy
• phase
• Nitrogen
• Hydrogen
• iron
• phase diagram
• iron powder