Ammonia dissociation in the fluidised bed furnace

King, P. C., Reynoldson, R. W., Brownrigg, Allan and Long, John 2005, Ammonia dissociation in the fluidised bed furnace, Materials forum, vol. 29, pp. 98-102.

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Title Ammonia dissociation in the fluidised bed furnace
Author(s) King, P. C.
Reynoldson, R. W.
Brownrigg, Allan
Long, JohnORCID iD for Long, John
Journal name Materials forum
Volume number 29
Start page 98
End page 102
Publisher Institute of Materials Engineering Australasia Pty Ltd
Place of publication Australia
Publication date 2005
ISSN 1447-6738
Keyword(s) Metallurgy
Summary 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.
Notes Variant Title : Annual review journal of the Institute of Materials Engineering Australasia LTD
Language eng
Field of Research 091499 Resources Engineering and Extractive Metallurgy not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2005, Institute of Materials Engineering Australasia Ltd
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