Articles - Improvement of properties of self-flowing low-cement castables based on brownfused alumina
- Cem Gögta¸sa, Akln Odaba¸sla, Levent Sezera, Filiz Çlnarb, ¸ Sule Günerc, Niyazi Eruslua and Necip Ünlüa,*
- a Istanbul Technical University, Metallurgical and Materials Science Engineering Department, 34469 Maslak, Istanbul, Turkey b Istanbul Technical University, Prof. Dr. Adnan Tekin High Technological Ceramics and Composites Research Center, 34469, Maslak, Istanbul, Turkey c Refsan Refrakter ve Insaat Ltd. Sirketi, Sultan Selim Cad. Ucar Sok. No:10/A, 34330, 4. Levent, Istanbul, Turkey
Abstract
A new self flowing brown-fused alumina based castable with 5 wt.% cement has been developed. An Andreason mathematical model (q=0.25) was used to adjust the granulometric particle size distribution. To achieve optimum self-leveling flowability, 5.6% water was used. The main physical and mechanical properties of the present castable were studied. Phase analysis using X-ray diffraction (XRD), scanning electron microscopy (SEM) and apparent porosity (AP), bulk density (BD), water absorption (WA), cold crushing strength (CCS), hardness, and self-leveling flowability were investigated as a function of the firing temperature. The castable exhibited low AP and WA, and high CCS values with an increase in the firing temperature as a result of the corresponding phases.
Keywords: workability; cement; refractory castable; mechanical properties; characterization
This Article
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