Laboratory Investigation of the Active Nitridation of Graphite by Atomic Nitrogen

The reaction efficiency for the active nitridation of graphite by atomic nitrogen was investigated using a furnace-heated quartz flow tube coupled to a microwave discharge. Experiments were performed in N/N2N/N2 mixtures with gas pressures ranging from about 130 to 670 Pa and furnace temperatures fr...

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Bibliographic Details
Published in:Journal of thermophysics and heat transfer 2012-01, Vol.26 (1), p.10-21
Main Authors: Zhang, Luning, Pejaković, Dušan A, Marschall, Jochen, Dougherty, Max, Fletcher, Douglas G
Format: Article
Language:English
Subjects:
Collisions
Furnaces
Graphite
Interpolation
Quartz
Test times
Titration
Tubes
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Summary:The reaction efficiency for the active nitridation of graphite by atomic nitrogen was investigated using a furnace-heated quartz flow tube coupled to a microwave discharge. Experiments were performed in N/N2N/N2 mixtures with gas pressures ranging from about 130 to 670 Pa and furnace temperatures from 873 to 1373 K. The N-atom concentrations entering and exiting the furnace were measured by chemical titration via the N+NO[arrow right]N2+ON+NO[arrow right]N2+O reaction, and the atom concentration at the graphite sample location was determined by interpolation, using a simple reactive-flow model. The reaction efficiency for graphite nitridation was derived from the interpolated N-atom concentration and the measured graphite mass loss for a given test time. The reaction efficiency, defined as the fraction of N-atom collisions with the surface that result in the title reaction, was found to increase from ∼0.2×10-3∼0.2×10-3 at 873 K to ∼9.8×10-3∼9.8×10-3 at 1373 K. [PUBLISHER ABSTRACT]
ISSN:0887-8722
1533-6808
DOI:10.2514/1.T3612