Mass spectrometric determination of vapor pressure over some carbon materials

The composition of vapour, partial pressures, mean effective heats of sublimation and standard variations of free energies of steam-gas components have been determined over the PG-50, MPG-6, PROG-2400, UPV-1T and SU-2500 carbon graphite materials by the mass-spectroscopic method in the range of 2400-2950 K. No significant difference is found in vapour pressures over different CGM. The effect of anomalous acceleration in evaporation of carbon components of PG-50, MPG-6 and PROG-2400 graphites has been observed above 2950 K. For the UPV-1T and SU-2500 materials this critical temperature is 50-100 K higher