Heterogeneous stress field within large fused-cast zirconia bricks probed by neutron diffraction
The manufacturing of high quality glasses and the need to increase the lifetime of furnaces used for glass fabrication, imply the development of new high zirconia refractory materials with good thermomechanical properties. This material is indeed used to make large bricks (~450×400×250 mm3, and 250kg) that are adjusted to build the inner wall of huge glass furnaces. During the fused-cast process used to elaborate these bricks, zirconia is undergoing two phase transitions (cubic → tetragonal → monoclinic) at ~2300°C and ~1000°C respectively, the latter being associated with a large increase of the lattice cell volume (~ 4%). A heterogeneous microstructure is observed in such bricks, and large internal stresses, which could be at the origin of defects and sometimes failures, are expected. The aim of the present proposal is to perform diffraction experiments on a whole brick in order to investigate the effect of the elaboration process on the residual stresses distribution, at a scale rrepresentative of macroscopic gradients on a whole brick.
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CASTELNAU Olivier; CHOTARD Thierry; GOURAUD Fanny; GUINEBRETIERE RENE; HUGER Marc; MICHEL Vincent; ORS Taylan and PIRLING Thilo. (2015). Heterogeneous stress field within large fused-cast zirconia bricks probed by neutron diffraction. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-171
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