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Optimisation de la mesure de champ de déformation à haute température et caractérisation thermomécanique de matériaux réfractaires d’alumine spinelle

Abstract : Alumina spinel refractories are known for their good performance in several areas of steel ladle lining. This study includes a thermomechanical investigation of an industrial alumina spinel bricks which allowed to detect microcracking (while cooling below 650 °C), brittle-ductile transition (at around 1100 °C) and variations of spinel content and stoichiometry being dependent on applied thermal treatment. Another investigation, related to model alumina spinel castables, reveals impacts of different types of aggregates, reactive aluminas and cements. Results obtained from both above-mentioned studies are interpreted in relation to likely performance in application. Apart from the material-oriented investigations, a significant part of this PhD study is dedicated to an improvement of two experimental techniques. The first one, used for high-temperature mechanical testing coupled with Digital Image Correlation (DIC) methods, has been improved to accurately monitor strain fields at high temperatures (1200 °C). This investigation includes optimization of high-temperature resistant speckle pattern and image pre-treatment for more accurate DIC measurements. The second type of improved experimental technique is a novel thermal shock bench (ATHORNA device). In this case, the experimental results, obtained by optical methods, are compared with finite element modelled results, being the first attempt to validate the numerical model with this device. Additionally, an investigation comparing ATHORNA and wedge splitting test results, performed on model magnesia spinel materials, allowed to demonstrate that ATHORNA can also be used for comparing thermal shock resistance of refractories.
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Robert Piotr Kaczmarek. Optimisation de la mesure de champ de déformation à haute température et caractérisation thermomécanique de matériaux réfractaires d’alumine spinelle. Matériaux. Université de Limoges, 2021. Français. ⟨NNT : 2021LIMO0114⟩. ⟨tel-03644452⟩

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