Journal ArticleDOI
Development of Activated Alumina and its Effect on the Properties of Cement Free Castables Refractories
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In this article, the authors used X-ray diffraction analysis to identify the phases formed while SEM studies have been used to get an idea about the microstructure of the castable matrix.Abstract:
Activated alumina is prepared by thermal dehydration (300°-600°C) of chemically pure aluminium hydroxide. The prepared materials have been characterized by residual water content, BET surface area and hydraulic activity. These aluminas are incorporated in cement free castable batch. Important properties like bulk density, apparent porosity, linear change, cold compressive strength, strength retainment after thermal shock have been studied. X-ray diffraction analysis has been performed to identify the phases formed while SEM studies have been used to get an idea about the microstructure of the castable matrix.read more
Citations
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Journal ArticleDOI
Fabrication of Activated Alumina Using Aluminum Hydroxide by a Hydrothermal Process
Hyeon Cheol Bae,Sang-Jin Lee +1 more
TL;DR: In this article, a new fabrication process for high-quality activated alumina with aluminum hydroxide is introduced, and the effects of aging and drying condition during the fabrication process affected the loss of ignition, the sedimentation time of the alumina suspension, as well as the surface area of the activated alumina.
Journal ArticleDOI
Effect of nanometric zirconia-mullite precursor on the properties of low cement castables
N. Acharjee,P. K. Das Poddar +1 more
TL;DR: In this article, white tabular alumina aggregate, calcium aluminate cement bond material, microsilica, microfine alumina and nanometric zirconia-mullite precursors are used in the formulation.
References
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Journal ArticleDOI
Castable refractory concretes
TL;DR: In this article, the development from conventional high cement materials, through low cement and ultra-low cement castables to the present materials which may be entirely free of CAC is discussed.
Journal ArticleDOI
Drying behavior of hydratable alumina-bonded refractory castables
Fábio A. Cardoso,Murilo D. M. Innocentini,Marcela Miranda,F. A. O. Valenzuela,Victor C. Pandolfelli +4 more
TL;DR: In this article, the drying behavior of a hydratable alumina-bonded (HAB) refractory castable was evaluated by thermogravimetric tests and compared with an ultra-low cement composition (CAC).
Journal ArticleDOI
Mechanisms of Reaction of Hydratable Aluminas
Weiping Ma,Paul W. Brown +1 more
TL;DR: In this paper, the reactivities of four hydratable aluminas were investigated by isothermal calorimetry and the rates of heat liberation during hydration from 15° to 55°C were determined.
Journal ArticleDOI
Hydration of hydratable alumina in the presence of various forms of MgO
G. Ye,Tom Troczynski +1 more
TL;DR: In this paper, the hydration behavior of hydratable alumina in the presence of several forms of magnesia used for production of refractory castables was investigated with an X-ray diffractometer and calculated from thermogravimetric analysis.
Journal Article
Refractory castables based on colloidal silica and hydratable alumina
TL;DR: Colloidal silica and hydratable alumina as a combined binding system can bring better advantages to the processing and properties of refractory castables as mentioned in this paper, which can be used to improve the efficiency of castable processing.
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