Effect of nano iron oxide as an additive on phase and microstructural evolution of Mag-Chrome refractory matrix

Azhari, Azmir; Golestani‐Fard, F.; Sarpoolaky, H.

doi:10.1016/j.jeurceramsoc.2009.03.032

Cited by 29 publications

(6 citation statements)

References 8 publications

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“…Micrografías SEM de un material refractario de sílice (a y b) sin partículas y con partículas de TiO 2 (b y c). (Carlucci et al, 2015) Usando nanopartículas de Fe 2 O 3 , Azhari et al (2009) estudiaron el efecto de la inclusión de nanopar tículas de óxidos de hierro en la microestruc-tura de una matriz de ladrillos refractarios magnesia-cromo Mg-Cr. El estudio encontró que la pre sen cia de nanopartículas de óxido férrico (Fe 2 O 3 ), favorece a la forma ción de espinela magnesio ferrítica (MgAl 2 O 4 ) a bajas temperaturas, mejo rando el proceso de sinterizado de la matriz del material refractario.…”

Section: Resultsunclassified

Nanotecnología Aplicada en Materiales Refractarios: Una Revisión

Carrión

Pilaquinga

2020

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Los materiales refractarios son de gran importancia para la humanidad, debido a su capacidad de resistir altas temperaturas. Son empleados en la industria del cemento, cerámica, vidrio, metalúrgica, siderúrgica y petroquímica. La mayor preocupación a nivel industrial, es que los materiales refractarios son sometidos a varios mecanismos de desgaste durante el proceso de producción, tales como: ataque químico, mecánico, termomecánico y carga térmica. Si el material no cuenta con las propiedades adecuadas, su durabilidad se verá afectada, y por ende los costos de producción. En este sentido la combinación de los nanomateriales, se convierte en una importante alternativa para mejorar las propiedades de los materiales refractarios, proporcionándoles mejor densidad, baja porosidad, resistencia a la erosión, baja conductividad térmica, entre otras. El presente artículo realiza una revisión de varios trabajos de investigación, acerca de la evolución de los nanomateriales aplicados a los materiales refractarios, entre los que se mencionan el uso de grafeno, dióxido de titanio, óxido férrico, magnesia, zirconia, alúmina y sílice, para mejorar las propiedades físicas de los materiales refractarios. De manera general, los estudios demuestran que el uso de los nanomateriales, provee a los materiales refractarios mejores propiedades, en rangos de concentración específicos. Sin embargo, todos los estudios han sido realizados a nivel de laboratorio, por lo que sería promisorio su uso a nivel industrial.

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Section: Resultsunclassified

Nanotecnología Aplicada en Materiales Refractarios: Una Revisión

Carrión

Pilaquinga

2020

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“…Moreover, the fine reaction product was well distributed in the treated layer, and that located on the triple points and CaO grain boundaries, which reduced its free contact area with water vapor. Nanoparticles were favorable for the formation of direct bonding between grains by decreasing the dihedral angle 33 …”

Section: Discussionmentioning

confidence: 99%

Improved hydration resistance of CaO granules via sol‐processed metal oxide protective layers

Wei

Jin-hu

et al. 2021

J Am Ceram Soc

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Well‐sintered CaO granules with hydration resistance are very important for the manufacturing and application of CaO‐containing refractories. CaO granules with sol‐processed metal oxide protective layers were prepared by granulation and surface treatment. The obtained results indicated that the usage of nano sol greatly improved the hydration resistance of CaO granules, especially when the CaO granules were treated by alumina sol. The promoting effect of nano sols in the sintering processes improved the density of CaO granules. Nanoparticles reacted with lime at lower temperature and a new phase was formed uniformly in the treated layer, which promoted densification of the treated layer. The grain size of CaO granules in the treated layer was increased obviously with the promotion of sintering. Moreover, nanoparticles were favorable for the formation of direct bonding between CaO grains by decreasing the dihedral angle.

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“…The results showed that as the particle size of Cr 2 O 3 was reduced (≈20 nm), the density of the MgO refractories was enhanced at relatively low temperatures (≈850 • C). Azhari et al [58] investigated the effect of the addition of nano-Fe 2 O 3 on the magnesia-chrome refractory matrix; they found that the dissolution of nano-Fe 2 O 3 and ionic migration improved the sintering process as well as the direct bonding structure. Huizhong et al [59] also studied the addition of nano-Fe 2 O 3 on the magnesia-chrome refractory matrix.…”

Section: Introductionmentioning

confidence: 99%

Development of an Ultra-Low Carbon MgO Refractory Doped with α-Al2O3 Nanoparticles for the Steelmaking Industry: A Microstructural and Thermo-Mechanical Study

Gómez-Rodríguez

Castillo-Rodríguez

Rodríguez-Castellanos

et al. 2020

Materials

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The effect of α-Al2O3 nanoparticles (up to 5 wt.%) on the physical, mechanical, and thermal properties, as well as on the microstructural evolution of a dense magnesia refractory is studied. Sintering temperatures at 1300, 1500, and 1600 °C are used. The physical properties of interest were bulk density and apparent porosity, which were evaluated by the Archimedes method. Thermal properties were examined by differential scanning calorimetry. The mechanical behavior was studied by cold crushing strength and microhardness tests. Finally, the microstructure and mineralogical qualitative characteristics were studied by scanning electron microscopy and X-ray diffraction, respectively. Increasing the sintering temperature resulted in improved density and reduced apparent porosity. However, as the α-Al2O3 nanoparticle content increased, the density and microhardness decreased. Microstructural observations showed that the presence of α-Al2O3 nanoparticles in the magnesia matrix induced the magnesium-aluminate spinel formation (MgAl2O4), which improved the mechanical resistance most significantly at 1500 °C.

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Effect of nano iron oxide as an additive on phase and microstructural evolution of Mag-Chrome refractory matrix

Cited by 29 publications

References 8 publications

Nanotecnología Aplicada en Materiales Refractarios: Una Revisión

Nanotecnología Aplicada en Materiales Refractarios: Una Revisión

Improved hydration resistance of CaO granules via sol‐processed metal oxide protective layers

Development of an Ultra-Low Carbon MgO Refractory Doped with α-Al2O3 Nanoparticles for the Steelmaking Industry: A Microstructural and Thermo-Mechanical Study

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