Evolution of an alumina-magnesia/self-forming spinel castable. Part II: physico-chemical and mechanical properties

Abstract

This study was carried out in conjunction with the investigation, reported in Part I, on the microstructural characteristics of an alumina-spinel castable with several percentages of MgO content. Bulk density and cold crushing strength of samples were evaluated dried and at three fired states (1000, 1200, 1400 °C). Results indicate little influence of MgO additions on physico-chemical properties of the alumina-magnesia/self-forming spinel castable. Characteristics compared with those reported for conventional alumina-spinel castables did not show large difference in values. Therefore, the alumina-magnesia/self-forming spinel castable could be a possible material for substitution of the conventional alumina-spinel castable.

Alumina‐spinel castable for steel ladles: An overview

“…44 However, a large number of cracks were generated with magnesia grain size finer than 100 µm and degraded the properties like mechanical strength and creep resistance. 44 Physicochemical, mechanical, and microstructural properties of in situ spinel castables were evaluated by Gutiérrez-Campos et al 45,46 at three different temperatures 1000, 1200, and 1400 • C with MgO content 5, 5.5, and 6 wt.%, respectively. Hu et al 47 investigated the role of a 5-µm size magnesium carbonate additive on the in situ spinel containing castable.…”