Engineering Commons^™

Phase Transformations In Oxides Above 2000°C: Experimental Technique Development, Sergey V. Ushakov, Alexandra Navrotsky

Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications IV

Oxidation of carbides-based ultra-high temperature ceramics is the main limiting factor for its use for aerodynamic surfaces. Experimental thermodynamic and structural data for refractory oxides above 2000 °C are mostly absent. The following techniques applied to fill this gap will be discussed: i) Commercial ultra-high temperature differential thermal analyzers (DTA) allow investigation of phase transformations and melting in inert environment to the temperatures up to 2500 °C; ii) Combination of laser heating with splittable nozzle aerodynamic levitator allow splat quenching and drop calorimetry from temperatures limited only by sample evaporation; iii) Synchrotron X-ray and neutron diffraction on laser heated aerodynamically …