Accession Number:

AD0759203

Title:

The Vaporization Coefficient of Graphite

Descriptive Note:

Final rept. 1 Apr 1970-1 Jan 1972

Corporate Author:

CINCINNATI UNIV OH DEPT OF MATERIALS SCIENCE AND METALLURGICAL ENGINEERING

Personal Author(s):

Report Date:

1972-12-01

Pagination or Media Count:

55.0

Abstract:

Relative values of the vaporization coefficients of C, C2, and C3, the predominant vapor species of graphite, were evaluated by comparing the ratios between the ion intensities of different carbon vapor species obtained in a free Langmuir vaporization experiment and in an equilibrium Knudsen vaporization experiment. The measurements of the ion intensities of carbon vapor species over the spectrographic electrode grade graphite were carried out using a RF induction heating furnace coupled with a Bendix Time-of-Flight mass spectrometer. The data in literature on pyrolytic graphite was also analyzed an interpretation of the vaporization coefficients of pyrolytic graphite is difficult as the pyrolytic graphite vaporizes predominantly from cracks, etc.

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE