The High Temperature Thermochemical Properties of Carbon.

Abstract

Abstract : A new method based on the combined use of carbon laser ablation data and analytical modeling has been used to determine carbon vapor pressure and vaporization coefficients at high temperatures (up to 4600 deg K). The JANAF carbon species C3 thermochemical data have been rejected in favor of alternate data. The JANAF data predict a total vapor pressure too low by a factor of greater than two at 4000 deg K. The melt temperature of carbon has been concluded to be greater than 4500 deg K using a surface reflectivity method. The temperature dependence of vaporization coefficients for carbon species has been determined for the first time from 3300 to 4600 K. (Author)