Multiscale creep characterization and modeling of a zirconia-rich fused-cast refractory

Abstract

This work aims at investigating the mechanical behaviour of a zirconia-rich fused-cast refractory at high temperature (C). The geometry of the zirconia phase was analysed on samples having contents of amorphous phase ranging from 12 to 24% in volume, from 3D images obtained using the X-ray computed micro-tomography technique. The sharp intrication of the dendrites creates a continous zirconia skeleton which was characterized experimentally. Results at high temperature show that deformation is controlled by zirconia, whereas the amorphous phase does not play any structural role. Finite-element simulations have been carried out to predict the creep behaviour of the aggregate. The creep law of the zirconia skeleton was identified by an inverse method from a creep test at C and from the 3D real morphology of the dendritic zirconia structure. Simulation results confirm that the rheology of the aggregate is controlled by the zirconia skeleton and a good agreement was observed between numerical creep tests and experiments.

Keywords:

• creep
• zirconia
• glassy phase
• tomography
• dendritic structure
• finite element

Acknowledgments

The authors are grateful to R. Lerallut (Mines-ParisTech), D. Jeulin (Mines-ParisTech), Y. Ding (Mines-ParisTech) and F. N’Guyen (Mines-ParisTech) for their scientific support. This work was supported by the French Ministry of Industry (M. Mussino under grant RNMP “PROMETHEREF”) and Saint-Gobain CREE (C. Bert, I. Cabodi, M. Gaubil, Y. Boussant-Roux).