Loading...

A comparative evaluation of the additional impact of nanometer-sized tetravalent oxides on the performance of doloma-magnesia ceramic refractories

Ghasemi Kahrizsangi, S ; Sharif University of Technology | 2018

1031 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2017.10.151
  3. Publisher: Elsevier Ltd , 2018
  4. Abstract:
  5. In this research study, a comparative evaluation of the additional impact of nanometer-sized tetravalent oxides [Zirconia (ZrO2), Titania (TiO2), and Silica (SiO2)] on the properties and performance of Doloma-Magnesia (MgO-CaO) ceramic refractories, with an emphasis on their hydration resistance improvement, has been done. For this purpose, from 0 to 2.5 wt% ZrO2, TiO2, and SiO2 nanometer-sized particles have been added to the Doloma-Magnesia compositions. After formulation and mixing of the starting materials, the pressed samples (at 150 MPa) were tempered (at 250 °C for 12 h) and fired in a shuttle furnace (at 1650 °C for 3 h). The physical, mechanical, and thermo-mechanical properties of the fired samples have been investigated. Also, in order to detect the created crystalline phases and microstructure evaluation of the fired specimens, the XRD and SEM/EDS analysis have been used. The results showed that the use of silica, as well as zirconium and titanium nanometer-sized particles, have improved the sintering process via the liquid and solid state firing process mechanism, respectively. Also, the hydration resistance improvement order of the samples containing various nanometer-sized oxides is as ZrO2 > TiO2 > SiO2. Finally, in order to obtain the highest values of physical, mechanical and thermo-mechanical properties, the optimum content of each nanometer-sized tetravalent oxides was determined as ZrO2 = 2.5, TiO2 = 2.5, and SiO2 = 1 wt%. © 2017 Elsevier Ltd and Techna Group S.r.l
  6. Keywords:
  7. Doloma-Magnesia ; Ceramic materials ; Hydration ; Magnesia ; Magnesia refractories ; Mechanical properties ; Refractory materials ; Silica ; Sintering ; Titanium compounds ; Titanium dioxide ; Zirconia ; Zirconia refractories ; Zirconium compounds ; Hydration resistance ; Mechanical and thermo-mechanical properties ; Microstructure evaluations ; Nanometer-sized ; Nanometer-sized particles ; SEM/EDS ; Tetravalent ; Thermomechanical properties ; Silicon compounds
  8. Source: Ceramics International ; Volume 44, Issue 2 , 2018 , Pages 2058-2064 ; 02728842 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0272884217323532