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Influences of oxygen impurity contained in nitrogen gas on the reactions of chromium with nitrogen

Published online by Cambridge University Press:  03 March 2011

Yung-Shou Ho ,
Fong-Shung Huang  and
Fu-Hsing Lu
Yung-Shou Ho*
Affiliation:
Department of Applied Chemistry, Foo-Ying University, Ta-Liao Hsiang, Kaohsiung Hsien 831, Taiwan, Republic of China
Fong-Shung Huang
Affiliation:
Department of Medical Technology, Foo-Ying University, Ta-Liao Hsiang, Kaohsiung Hsien 831, Taiwan, Republic of China
Fu-Hsing Lu
Affiliation:
Department of Materials Engineering, National Chung Hsing University, Taichung 402, Taiwan, Republic of China
*
a)Address all correspondence to this author. e-mail: sc052@mail.fy.edu.tw
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Abstract

In this research, the influences of the oxygen impurity contained in the commercially available nitrogen gas on the reactions of chromium pellets with nitrogen were investigated in the temperature range 600–1350 °C. A small amount of oxygen competed with the majority N2 to react with chromium in the annealing process. Analyzing the in situ oxygen partial pressure changes during annealing proved that the dissolution of oxygen in Cr and/or resultant CrxN (CrN or Cr2N) was exothermic and the solubility decreased with increasing temperature. It was found that the oxygen partial pressure decreased drastically to about 10−22 atm when specimens were annealed at 600 °C compared to a mere 10−5 atm for a blank test, while its value increased with temperature. The oxidation involved simultaneous dissolution of oxygen in specimens and formation of oxide scale. Moreover, comparing the aforementioned results with those obtained from additional annealing experiments preformed in argon gas showed that the formation of Cr2O3 might stem mainly from oxidation of the resultant nitrides instead of the metallic chromium.

Keywords

Oxidation/annealingPhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 10 , October 2005 , pp. 2745 - 2753
Copyright
Copyright © Materials Research Society 2005

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References

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