Characterization of the Mechanical Behavior of Magnesia Spinel Refractories Using Image Correlation

Abstract

International audienceThe improvement in thermal shock resistance of refractory materials is among the crucial properties that interest researchers and industrials. The "flexibility" in terms of large strain-to-rupture is, up to now, an important parameter to develop such characteristic. This can be obtained by generating a network of microcracks within the microstructure of the material under mechanical solicitations. As an outcome, the mechanical behavior can vary from fragile to a large nonlinear one depending on the degree of microcracking present inside the material. In fact, this nonlinear behavior of ceramics related to their microstructure is behind the possibility to enhance the level of strain-to-rupture for a better accommodation to the high level of strain induced by thermal shock solicitations. This study is devoted to apply digital imaging correlation method to support mechanical behavior analysis for the evaluation of the thermal shock ability of refractory materials. In this paper, mechanical characterization of magnesia spinel materials has been carried out using different experimental tests. These nonlinear materials are characterized by a mechanical behavior strongly dependent on their microstructure

Combination of Numerical, Experimental and Digital Image Correlation for Mechanical Characterization of Al2O3/β-TCP Based on CDM Criterion

“…For each subset, a correlation function is used to estimate the degree of similarity between the reference image state and the current one (for each given load) [31].…”

Improvement of Durability of Purging Plugs Using MgO Micropowder for Refining Ladles

“…Several studies have reported the thermal shock resistance and slag resistance of aluminamagnesia castables. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Additives such as TiO 2 , 6,7 SiO 2 , 8-10 and ZrO 2 11 have been introduced into alumina-magnesia castables to improve their performance. The effect of spinel composition on the slag resistance of alumina-spinel and alumina-magnesia castables was investigated by Ko,13,14 who found that the extent of penetration of slag into the prepared castables decreased with increasing MgO content in the spinels.…”

“…Alumina–magnesia castables have been considered potential replacements to alumina–chrome castables. Several studies have reported the thermal shock resistance and slag resistance of alumina–magnesia castables . Additives such as TiO 2 , SiO 2 , and ZrO 2 have been introduced into alumina–magnesia castables to improve their performance.…”