Dresden 2009 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 25: Topical Session High Temperature Materials I

MM 25.5: Vortrag

Mittwoch, 25. März 2009, 11:45–12:00, IFW A

High Temperature Stability of Nanostructured Amorphous Si-C-N Materials — Wolfgang Gruber and •Harald Schmidt — TU Clausthal, Institut für Metallurgie, AG Materialphysik, Germany

Polymer-derived Si-C-N ceramics are a new class of multifunctional high temperature materials with applications in various branches of technology. After synthesis, these materials consist of amorphous nanodomains which are expected to have a crucial importance for the extraordinary high temperature stability. Annealing at temperatures above 1400 °C leads to formation of nanocrystalline precipitations. We investigated the thermal stability, nanodomain growth and crystallization behaviour of these ceramics using XRD and small angle scattering techniques as well as diffusion studies. A model based on diffusion controlled nanodomain growth is proposed to explain the high temperature stability.