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Densification and properties of Fe2O3 nanoparticles added CaO refractories

Ghasemi Kahrizsangi, S ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2016.04.173
  3. Publisher: Elsevier Ltd
  4. Abstract:
  5. Up to 8wt. % of Nano-iron oxide was added to CaO refractory matrix. The crystalline phases and microstructure characteristics of specimens sintered at 1650°C for 5h in an electric furnace were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The physical properties are reported in terms of bulk density, apparent porosity and hydration resistance. The mechanical behavior was studied by a cold crushing strength (CCS) and flexural strength at 1200°C test. As a result, it was found that the presence of Nano-iron oxide in the CaO refractory matrix induced 2CaO.Fe2O3 (C2F), CaO.Fe2O3 (CF) and 3CaO.Al2O3 (C3A) phase's formation, which improved the sintering process. Nano-iron oxide also influenced the bonding structure through a direct bonding enhancement. On the Other hand, the presence of Nano-iron oxide resulting in improvement properties of CaO refractory matrix refractories such as bulk density, hydration resistance and cold crushing strength. The maximum flexural strength at 1200°C is achieved by the samples containing 4wt. % nano-Fe2O3
  6. Keywords:
  7. CaO refractory ; Flexural strength ; Aluminous refractories ; Bending strength ; Compressive strength ; Crushing ; Electric furnaces ; Hydration ; Iron ; Refractory materials ; Scanning electron microscopy ; Sintering ; X- ray diffraction ; Cold crushing strengths ; Crystalline phasis ; Hydration resistance ; Mechanical behavior ; Microstructure characteristics ; Nano iron oxides ; Refractory matrices ; Sintering process ; Iron oxides
  8. Source: Ceramics International ; 2016 ; 02728842 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0272884216305806