Effects of firing temperature on the physical properties of a bauxite-based refractory castable

Goegtas C., Ünlü N., ODABASI A., SEZER L., GUNER S., Göller G., ...Daha Fazla

REFRACTORIES AND INDUSTRIAL CERAMICS, cilt.53, sa.1, ss.19-25, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 53 Sayı: 1
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1007/s11148-012-9455-9
  • Dergi Adı: REFRACTORIES AND INDUSTRIAL CERAMICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.19-25
  • Anahtar Kelimeler: firing, x-ray methods, mechanical properties, Al2O3, refractories, ULTRALOW-CEMENT CASTABLES, MECHANICAL-PROPERTIES, ELEVATED-TEMPERATURES, THERMAL-CRACKING, ZERO-CEMENT, ALUMINA, COMPOSITE, STRESS
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

A self-flowing low-cement bauxite castable was prepared from 64 wt.% rotary Chinese bauxite and 10 wt.% Eczacibasi calcined alumina aggregates with additives of 5 wt.% Lafarge cement Secar 71, 8 wt.% Elkem microsilica 971U, and 0.05 wt.% dispersant Darvan 7S (D7S). Optimum self-leveling flowability was achieved using 5.6% water addition. As a function of the firing temperature, the physicomechanical and refractory properties of the self-flowing low-cement bauxite castable were characterized in terms of densification parameters such as apparent porosity (AP), bulk density (BD), water absorption (WA), and cold crushing strength (CCS). Phase analysis and microstructural-based evaluation were performed using x-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The present bauxite-based refractory castable heat treated at 1500A degrees C for 2 h exhibited the following properties: AP 13%, BD 2.93 g/cm(3), WA 4.4%, and CCS 1365 kg/cm(2).