Study of damage of high zirconia fused-cast refractories by measurement of Young's modulus

Reconstruction of the Cubic and Tetragonal Parent Grains from Electron Backscatter Diffraction Maps of Monoclinic Zirconia

“…The monoclinic zirconia used in this study comes from a fused‐cast refractory material elaborated by Saint‐Gobain (Cavaillon, France). It forms a skeleton surrounded by interconnected glassy phases 8 . An EBSD map has been acquired on a ZEISS SUPRA 55 VP SEM (Carl Zeiss, Oberkochen, Germany) equipped with an Oxford/HKL EBSD system.…”

“…It forms a skeleton surrounded by interconnected glassy phases. 8 An EBSD map has been acquired on a ZEISS SUPRA 55 VP SEM (Carl Zeiss, Oberkochen, Germany) ] B. Muddle-contributing editor This work was supported by the French Ministry of Economy, Finance, and Industry for their financial support (ANR NOREV) and Saint-Gobain CREE (Cavaillon, France) for their technical collaboration. equipped with an Oxford/HKL EBSD system.…”

Microcracking of high zirconia refractories after t→m phase transition during cooling: An EBSD study

“…[1][2][3][4][5] During their manufacturing process, by casting from high temperatures (2700 • C), the zirconia undergoes up to two successive phase transformations: cubic to tetragonal (c → t at 2370 • C for pure zirconia) and tetragonal to monoclinic (t → m at around 1080 • C for the considered material in this study). The glassy phase is important to obtain such massive monoclinic zirconia materials because it prevents from extensive cracking during this last transition and it accommodates the internal stresses developed by the associated increase of volume 6,7 (3-5%).…”

“…Several mechanisms can be pointed out to explain the observed microcracking. 4,5 For instance, for the t → m phase transition, the supposed thermal expansion (TE) mismatch between glassy phase and zirconia during cooling or the presence of heterogeneities such as the porosity sizes or the variations of composition of the glassy phase could be proposed. As microcracking is mainly observed within zirconia, our work has been oriented by the possible impact of the thermal expansion anisotropy of the zirconia lattice.…”

A novel method to evaluate Young׳s modulus of ceramics at high temperature up to 2100°C

“…Obviously, the most important parameter for Young's modulus evaluation is the deflection value for bending test, and the basic frequency for IET. However, most of testing methods are not reliable to measure these parameters at high temperature over 1600 1C because of their respective weakness [4,20,21].…”