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The influence of silica nanoparticles addition on the physical, mechanical, thermo-mechanical as well as microstructure of Mag-Dol refractory composites

Gheisari Dehsheikh, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2017.09.073
  3. Abstract:
  4. The high hydration potential of CaO and MgO phases restricted the application of Mag-Dol refractory composites. In this study, the impact of nano-silica (SiO2) addition on the physical, mechanical, thermo-mechanical as well as microstructure of Mag-Dol refractory composites is investigated. Mag-Dol compositions were prepared by using calcined dolomite and magnesite particles (micron, 0–1, 1–3, 3–5, and 5–8 mm), liquid resin, and 0, 0.5, 1, 1.5, 2, and 2.5 wt% nano SiO2 as additives. Specimens were heated up to 1650 °C for the 3 h soaking period. Fired specimens were characterized by physical (apparent porosity, bulk density, and hydration resistance), mechanical (cold crushing strength), and thermo-mechanical (flexural strength at 1200 °C) measurements. XRD and SEM/EDS analysis were done to study phases and microstructure analysis of the fired samples, respectively. Results showed that by adding up to 2.5 wt% nano-SiO2, due to the formation of CaO·MgO·2SiO2 (Diopside), 2CaO·MgO·2SiO2 (Akermanite), and CaO·MgO·SiO2 (Monticellite) phases, physical and mechanical properties were enhanced. But the highest flexural strength value is achieved for 1 wt% nano-SiO2 containing sample. © 2017 Elsevier Ltd and Techna Group S.r.l
  5. Keywords:
  6. Mag-Dol refractory ; Microstructural ; XRD ; Bending strength ; Gas fuel manufacture ; Hydration ; Magnesia ; Microstructure ; Refractory materials ; Cold crushing strengths ; Hydration resistance ; Micro-structural ; Microstructure analysis ; Nano-SiO2 ; Physical and mechanical properties ; Refractory composites ; Silica nanoparticles ; Silica
  7. Source: Ceramics International ; Volume 43, Issue 18 , 2017 , Pages 16780-16786 ; 02728842 (ISSN)
  8. URL: https://www.sciencedirect.com/science/article/pii/S0272884217320023