Thermochemical heat of ablation of solid carbon

摘要

The thermochemical heat of ablation of carbon,HA, is usually set equal to 32 kJ/g as derived from the JANAF tables. There is, however, some uncertainty since JANAFhyphen;recommended values for heats of vaporization and partial vapor pressures differ from the results of a detailed analysis that was carried out at the Lawrence Livermore National Laboratory (LLNL). We find that the LLNL model yields carbonhyphen;vaporization enthalpies that are appreciably lower than the JANAFhyphen;based values. In this light, we examine experimental data generated in the course of a comprehensive investigation of laserhyphen;interaction effects in graphite and conclude that our experiments are indicative of anHAequal to 31.0plusmn;1.6 kJ/g.