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Some characteristics of the nitrogen-base atmosphere produced by passing an N2-H2O mixture through a hot-charcoal layer

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Journal of Heat Treating

Abstract

A simple method for generating nitrogen-base atmospheres will be introduced in this paper. A nitrogen-base atmosphere with minor constituents of H2 and CO can be prepared by passing commercial grade N2 mixed with some water vapor through a layer of hot charcoal. Steel foils were heated in the nitrogen-base atmospheres produced under different conditions. Based on the surface condition, weight change, and microstructure of the samples after heating, the effect of these nitrogen-base atmospheres on foil carbon content has been studied. The results indicate the following.

(1) Nitrogen-base atmospheres produced in this manner can effectively prevent steels from oxidation for water vapor contents over 0.5 pct. (2) The carbon potential of the nitrogen-base atmospheres increases with the amount of water added. (3) The carbon potential of nitrogen-base atmospheres increases with increasing temperature of charcoal. However, the carbon potential was found nearly constant at charcoal temperatures above 900 °C.

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Authors and Affiliations

  1. National Taiwan University in Taipei, Taiwan, R.O.C.

    Yong-Chwan Chen & Chen-Hsien Hwang

Authors
  1. Yong-Chwan Chen
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  2. Chen-Hsien Hwang
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Chen, YC., Hwang, CH. Some characteristics of the nitrogen-base atmosphere produced by passing an N2-H2O mixture through a hot-charcoal layer. J. Heat Treating 4, 75–83 (1985). https://doi.org/10.1007/BF02835492

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  • DOI: https://doi.org/10.1007/BF02835492

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