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Cem Gö tas,Akln Odabasl,Levent Sezera,Filiz Çlnarb,Sule Günerc,Niyazi Eruslua,Necip Ünlü 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.1
A white-fused low cement refractory castable was prepared from pure refractories that consisted of 77 wt.% white fused alumina, 10 wt.% calcined alumina, 8 wt.% microsilica, 5 wt.% cement and 0.05 wt.% dispersant. Optimum self-leveling flowability was achieved by using 5.6 wt.% water. To determine the effect of the firing temperature on the white-fused low cement refractory castable, studies of apparent porosity (AP), bulk density (BD), water absorption (WA), cold crushing strength (CCS), hardness, X-ray diffraction (XRD) and microstructural-based evaluation using electron probe microanalyser (EPMA) were performed. The present castable heat treated at 1500℃ for 2 h exhibited the following properties: the AP −14%, the BD −3.12 gcm−3, the WA −2.5%, the CCS −2000 kgcm−2 and the hardness −3185 kg㎟. The new white-fused alumina castable presents unique properties that would make it desirable to use in industrial refractory applications. A white-fused low cement refractory castable was prepared from pure refractories that consisted of 77 wt.% white fused alumina, 10 wt.% calcined alumina, 8 wt.% microsilica, 5 wt.% cement and 0.05 wt.% dispersant. Optimum self-leveling flowability was achieved by using 5.6 wt.% water. To determine the effect of the firing temperature on the white-fused low cement refractory castable, studies of apparent porosity (AP), bulk density (BD), water absorption (WA), cold crushing strength (CCS), hardness, X-ray diffraction (XRD) and microstructural-based evaluation using electron probe microanalyser (EPMA) were performed. The present castable heat treated at 1500℃ for 2 h exhibited the following properties: the AP −14%, the BD −3.12 gcm−3, the WA −2.5%, the CCS −2000 kgcm−2 and the hardness −3185 kg㎟. The new white-fused alumina castable presents unique properties that would make it desirable to use in industrial refractory applications.
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