The effect of phosphorus and oxygen on the nitriding of α-Fe

Hayes, P. and Grieveson, P. (1975) The effect of phosphorus and oxygen on the nitriding of α-Fe. Acta Metallurgica, 23 8: 937-942. doi:10.1016/0001-6160(75)90006-1


Author Hayes, P.
Grieveson, P.
Title The effect of phosphorus and oxygen on the nitriding of α-Fe
Formatted title
The effect of phosphorus and oxygen on the nitriding of α-Fe
Journal name Acta Metallurgica
ISSN 0001-6160
1873-2453
1359-6454
Publication date 1975-01-01
Sub-type Article (original research)
DOI 10.1016/0001-6160(75)90006-1
Open Access Status Not yet assessed
Volume 23
Issue 8
Start page 937
End page 942
Total pages 6
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Formatted abstract
The kinetics of nitriding of iron and iron-phosphorus alloys in ammonia-hydrogen gas mixtures have been investigated at 580°C. The rate of nitriding of pure iron was found to be consistent with that predicted assuming nitrogen diffusion in the solid to be the rate limiting step and this condition was also observed over a range of oxygen potentials under the same nitriding conditions. The presence of phosphorus in the iron was found to reduce nitriding rates. The rate limiting reaction in the nitriding of Fe-P alloys in ammonia-hydrogen gas mixtures at one atmosphere total pressure is determined to be NH2(adsorbed) → NH(adsorbed) + H(adsorbed). A first order reaction rate equation is developed which predicts the nitriding rate to be inversely proportional to the bulk phosphorus content of the alloy at a given hydrogen partial pressure.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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Created: Wed, 16 Dec 2015, 00:30:10 EST by Vicki Thompson on behalf of School of Chemical Engineering