Ammonia dissociation in the fluidised bed furnace
Data(s) |
01/01/2005
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Resumo |
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.<br /> |
Identificador | |
Idioma(s) |
eng |
Publicador |
Institute of Materials Engineering Australasia Pty Ltd |
Relação |
http://dro.deakin.edu.au/eserv/DU:30002971/n20050356.pdf |
Direitos |
2005, Institute of Materials Engineering Australasia Ltd |
Palavras-Chave | #Metallurgy #Metals #Materials |
Tipo |
Journal Article |