MgO–CaO–Cr2O3 composition as a novel refractory brick: Use of Cr2O3 nanoparticles
At this study the effect of Cr2O3 nanoparticles (up to 3 wt.%) on the physical and mechanical properties of MgO–CaO refractory composition with emphasis on the hydration resistance improvement have been investigated. Specimens pressed at 90 MPa then were sintered at 1650 °C for 5 h in an electric fu...
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2017-03-01
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doaj-045e2476ff964a26be0c2fbd1a50e9482020-11-24T21:49:04ZengElsevierBoletín de la Sociedad Española de Cerámica y Vidrio0366-31752017-03-01562838910.1016/j.bsecv.2016.11.002MgO–CaO–Cr2O3 composition as a novel refractory brick: Use of Cr2O3 nanoparticlesSalman Ghasemi-KahrizsangiHassan Gheisari DehsheikhMehdi BoroujerdniaAt this study the effect of Cr2O3 nanoparticles (up to 3 wt.%) on the physical and mechanical properties of MgO–CaO refractory composition with emphasis on the hydration resistance improvement have been investigated. Specimens pressed at 90 MPa then were sintered at 1650 °C for 5 h in an electric furnace. Properties such as bulk density, apparent porosity, cold crushing strength and hydration resistance were examined. The crystalline phases and microstructure characteristics of sintered specimens were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM/EDS), respectively. Results shown that add of the 1.5 wt.% Cr2O3 nanoparticles have the best results i.e. increased the bulk density (3.41 g/cm3), cold crushing strength (848 kg/cm2), hydration resistance (1.5%) and decreased apparent porosity (5.58%), respectively. The mechanism of specimens hydration resistance improvement are: (i) decreasing the amount of free CaO and MgO with converted to high hydration resistance phases such as CaCr2O4 and MgCr2O4 phases, (ii) promotion of the densification as well as (iii) modification of the microstructure.http://www.sciencedirect.com/science/article/pii/S0366317516301030Cr2O3 nanoparticlesHydration resistanceMgO–CaO refractory densification |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Salman Ghasemi-Kahrizsangi Hassan Gheisari Dehsheikh Mehdi Boroujerdnia |
spellingShingle |
Salman Ghasemi-Kahrizsangi Hassan Gheisari Dehsheikh Mehdi Boroujerdnia MgO–CaO–Cr2O3 composition as a novel refractory brick: Use of Cr2O3 nanoparticles Boletín de la Sociedad Española de Cerámica y Vidrio Cr2O3 nanoparticles Hydration resistance MgO–CaO refractory densification |
author_facet |
Salman Ghasemi-Kahrizsangi Hassan Gheisari Dehsheikh Mehdi Boroujerdnia |
author_sort |
Salman Ghasemi-Kahrizsangi |
title |
MgO–CaO–Cr2O3 composition as a novel refractory brick: Use of Cr2O3 nanoparticles |
title_short |
MgO–CaO–Cr2O3 composition as a novel refractory brick: Use of Cr2O3 nanoparticles |
title_full |
MgO–CaO–Cr2O3 composition as a novel refractory brick: Use of Cr2O3 nanoparticles |
title_fullStr |
MgO–CaO–Cr2O3 composition as a novel refractory brick: Use of Cr2O3 nanoparticles |
title_full_unstemmed |
MgO–CaO–Cr2O3 composition as a novel refractory brick: Use of Cr2O3 nanoparticles |
title_sort |
mgo–cao–cr2o3 composition as a novel refractory brick: use of cr2o3 nanoparticles |
publisher |
Elsevier |
series |
Boletín de la Sociedad Española de Cerámica y Vidrio |
issn |
0366-3175 |
publishDate |
2017-03-01 |
description |
At this study the effect of Cr2O3 nanoparticles (up to 3 wt.%) on the physical and mechanical properties of MgO–CaO refractory composition with emphasis on the hydration resistance improvement have been investigated. Specimens pressed at 90 MPa then were sintered at 1650 °C for 5 h in an electric furnace. Properties such as bulk density, apparent porosity, cold crushing strength and hydration resistance were examined. The crystalline phases and microstructure characteristics of sintered specimens were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM/EDS), respectively. Results shown that add of the 1.5 wt.% Cr2O3 nanoparticles have the best results i.e. increased the bulk density (3.41 g/cm3), cold crushing strength (848 kg/cm2), hydration resistance (1.5%) and decreased apparent porosity (5.58%), respectively. The mechanism of specimens hydration resistance improvement are: (i) decreasing the amount of free CaO and MgO with converted to high hydration resistance phases such as CaCr2O4 and MgCr2O4 phases, (ii) promotion of the densification as well as (iii) modification of the microstructure. |
topic |
Cr2O3 nanoparticles Hydration resistance MgO–CaO refractory densification |
url |
http://www.sciencedirect.com/science/article/pii/S0366317516301030 |
work_keys_str_mv |
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