Rate and Heat of Vaporization of Graphite above 3000deg;K

摘要

The rate of vaporization of graphite filaments has been measured from 2500 to 3400deg;K in vacuum and in He by pulse heating techniques. At 3400deg;K, the rate of vaporization was sufficiently high that a direct determination of the heat of vaporization could be obtained. The experimental results have been correlated with thermodynamic data obtained at lower temperatures on graphite and its vapor species; the predominance of C2in vaporizing graphite is shown to satisfy the experimental results. The specific surface area of the filaments was measured and interpreted.