THE VAPORIZATION OF PYROLYTIC GRAPHITE
Abstract
The vaporization of pyrolytic graphite was studied by the Knudsen effusion and Langmuir free vaporization techniques using a microbalance and a time-of-flight mass spectrometer. Vapor pressures were obtained in the temperature range 2417K - 2700K for C, C sub 2, and C sub 3; respective heats of vaporization were calculated by the third-law method. Langmuir vaporization measurements were carried out in the temperature range 2250K - 2760K. The ratios of vaporization coefficients obtained from mass spectroscopic measurements are: alpha sub 2/alpha sub 1 = 2.1, alpha sub 1/alpha sub 3 = 10.6. Use of vapor pressure data and vaporization rates was made to arrive at an overall vaporization coefficient equal to 0.095 and individual values of alpha sub 1 = 0.24, alpha sub 2 = 0.50 and alpha sub 3 = 0.023.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1966
- Accession Number
- AD0633611
Entities
People
- P. D. Zavitsanos
Organizations
- General Electric