Abstract
Ceramics are candidate materials for high temperature reactors as perspective materials for fuel claddings, isolation, holders, exchangers and other heat-stressed components. In this context, particularly Al2O3 which can resist high temperatures is often mentioned as cladding material. Ceramics can also be used for high-temperature systems, mainly for components that are not directly exposed to neutron flux in the reactor core. Under this study, high alumina products - mullite Lunit 73, alumina products Luxal 203 and AG 202 were exposed to the high-temperature air atmosphere and helium atmosphere up to 900°C. Exposed specimens were mechanically polished to study the microstructural changes after exposition. Microstructural evaluation was performed by Light Optical and Scanning Electron Microscopy. Luxal 203 and AG 202 showed no changes in the microstructure, whereas in Lunit 73 new phases were observed.
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