The characterization of Si-B-C-N amorphous ceramics using isothermal compression creep testing in the temperature range of 1200-1500 is reported. The deformation rate contains a stress-dependent component that is proportional to the applied stress, which indicates that this portion of the deformation mechanism is based on viscous flow. An increase in the creep resistance is observed, following either preliminary annealing or hot isostatic pressing, which may be explained by a reduction of free volume in the amorphous material. The application of two deformation models that are used to predict similar deformation behaviour in metallic glasses is also discussed.
Origin
Max-Planck-Inst Metallforschung
Journal Title
J Am Ceram Soc 83 12 2000 3025-3032
Sector
Glass Ceramics
Class
GC 404