 | THERMOLYSIS MECHANISMS, AMORPHOUS STATE, AND CRYSTALLIZATION
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| | | 1) Max-Planck-Institut für Metallforschung and Institut für Nichtmetallische Anorganische Materialien, Universität Stuttgart, Pulvermetallurgisches Laboratorium |
| | The transformation of polysilazanes and polysilylcarbodiimides into amorphous Si-C-N ceramics based on solid state NMR, IR and mass spectroscopy studies is described. The ceramization mechanisms and the phase formation during the polymer-ceramic transformation are discussed. Moreover, the structure of the obtained amorphous ceramic solids is derived from X-ray and neutron small angle scattering investigations. The obtained results reveal essential relations between the architecture of the preceramic polymers and the corresponding amorphous stages. Furthermore, TEM is applied for the characterization of the corresponding crystalline solids. The experimental data are combined with calculations based on the CALPHAD approach in order to provide a quantitative description for the thermochemistry of the polymer systems and for the formation of the ceramic phases that evolve from the precursors. |
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