Abstract
A Si-C-N ceramic was synthesized by pyrolysis of the polysilazane Ceraset® PSZ 10 and PSZ 20. The preceramic polymer was crosslinked by gradual heating up to 300 °C and pyrolyzed at temperatures from 1000 °C to 1500 °C in flowing Ar- and N2-containing atmospheres, respectively. The influence of the pyrolysis temperature and the nitrogen partial pressure (pN2) on the high-temperature stability, phase reactions and crystallization behavior was investigated by STA, XRD and SEM/EDX. Additionally, gaseous pyrolysis- and reaction products were analyzed by on-line mass spectrometry. The CALPHAD (CALculation of PHAse Diagrams) method was used to calculate pyrolysis products and high-temperature phase stabilities as a function of temperature and pAr/pN2. It is shown that the observed experimental findings are quantitatively confirmed and explained by the modelling.
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