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Ammonia dissociation in the fluidised bed furnace

journal contribution
posted on 2005-01-01, 00:00 authored by P King, R Reynoldson, Allan Brownrigg, John LongJohn Long
Ammonia dissociation is the controlling reaction for several important thermochemical heat treatment processes; nitriding, nitrocarburising (ferritic and austenitic) and carbonitriding. The fluidised bed furnace is a convenient and widely used medium for all of these treatments, yet understanding of the reaction in a fluidised bed context is minimal. This paper deals with the influence of process parameters on nitrogen activity aN; temperature, fluidising flowrate, ammonia inlet level, carbonaceous gas. Two basic behaviours were observed; inlet NH3-dependant and inlet NHr insensitive, with a transition region at intermediate temperatures. The nitrocarburising response of steel specimens was measured by optical microscopy of the layer thicknesses and glow discharge optical emission spectroscopy (GD-OES) determination of nitrogen depth-penetration profiles. aN was found by gas analysis of the exit stream ammonia with the aid of a dissociation burette.

History

Journal

Materials forum

Volume

29

Pagination

98 - 102

Publisher

Institute of Materials Engineering Australasia Pty Ltd

Location

Australia

ISSN

1447-6738

Language

eng

Notes

Variant Title : Annual review journal of the Institute of Materials Engineering Australasia LTD

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2005, Institute of Materials Engineering Australasia Ltd

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