Effect of MgAl2O4 nanoparticles addition on the densification and properties of MgO-CaO refractories

Ghasemi-Kahrizsangi, Salman; Dehsheikh, Hassan Gheisari; Karamian, Ebrahim; Boroujerdnia, Mehdi; Payandeh, Khoshnaz

doi:10.1016/j.ceramint.2017.01.011

Cited by 53 publications

(13 citation statements)

References 17 publications

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“…This feature together with the improvement of the other properties evidenced that the ceramic sector can be a receiver of this type of waste, making incorporations in relatively high percentages for these processes. This is probably due to the fact that the addition of corundum increases the mullite fraction, which was verified by the preliminary analyzes of X-ray diffraction and scanning electron microscopy, results that will be exposed in a future investigation, and that may be related to the increase on mechanical strength and wear resistance [30]. …”

Section: Structural Characterization (Open Porosity) Of the Fired Partssupporting

confidence: 52%

Effects of corundum in the development of structural, mechanical and tribological properties of raw materials for the manufacture of structural products

Illera

Niño

2018

Cerâmica

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Improving the technological properties of a ceramic product without affecting its aesthetic quality is a daily challenge of the regional ceramic companies. To achieve this objective, analyzes were performed on an illitic-kaolinitic clay by adding corundum as an additive. The corundum content varied from 5% to 20% by weight with a particle size of less than 75 μm, being able to obtain products with low porosities and high mechanical resistance. This research is part of a series of studies carried out on an argillaceous raw material from the region of Norte de Santander (Colombia). The influence of the corundum content on the technological properties was evaluated. The results showed that corundum, when mixed with traditional raw materials, offers the conditions to be used as an additive in the production of ceramic products with increases of up to 67% in mechanical strength and a reduction of porosity of 46%, which can contribute to the development of value-added ceramic products for use in other technological applications.

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Section: Structural Characterization (Open Porosity) Of the Fired Partssupporting

confidence: 52%

Effects of corundum in the development of structural, mechanical and tribological properties of raw materials for the manufacture of structural products

Illera

Niño

2018

Cerâmica

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“…Also, the high melting points of the MgO (2800 • C) [3,4,25], ZrO 2 (2715 • C) [3,4] and of the phase formed in situ CaZrO 3 (2340 • C) [3,4], promoted the densification of the material by sintering in solid state. The CaO/SiO 2 ratio remained high (>2.8) in the raw material of MgO; no liquid phase sintered was present which would have promoted a higher density, but it would have an impact on the formation of phases of low melting point, making the refractory susceptible to resist lower temperatures.…”

Section: Densificationmentioning

confidence: 99%

“…%) [24], MgAl 2 O 4 (up to 6 wt. %) [25], TiO 2 [26,27], Cr 2 O 3 [28], trivalent oxides [29], ZrSiO 4 [30], SiO 2 [31] and Fe 2 O 3 [32]. They have obtained optimal results in mechanical, physical, chemical, and thermomechanical properties, but also improvements in the hydration resistance and in the sintering process were observed.…”

Section: Introductionmentioning

confidence: 99%

MgO Refractory Doped with ZrO2 Nanoparticles: Influence of Cold Isostatic and Uniaxial Pressing and Sintering Temperature in the Physical and Chemical Properties

Gómez-Rodríguez

González

García-Quiñonez

et al. 2019

Metals

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The chemical environment and the internal conditions of the furnaces and ladles are extremely aggressive for the refractories, so metallurgical industries demand refractory linings with greater durability and resistance to avoid unforeseen stoppages and to reduce the changes of the furnace lining. Therefore, the current work aims to evaluate the impact of the additions of ZrO 2 -nanoparticles (1, 3, and 5 wt. %) in magnesia-based bricks. A comparative study of the physical and chemical properties in bricks obtained using two cold pressing techniques (uniaxial and isostatic pressing) and two sintering temperatures (1550 and 1650 • C) was carried out. The microstructure and crystalline phase characteristics obtained after the heat treatments and the slag corrosion test was studied using scanning electron microscopy/electron dispersive X-ray spectroscopy (SEM/EDX) and X-ray diffraction (XRD). The results reveal that the sample with 5 wt. % of ZrO 2 nanoparticles (obtained by cold isostatic pressing and sintering at 1650 • C) has the lowest porosity and greatest resistance to penetration of blast furnace slag.2 of 20 to the martensitic transformation of the steels [2]. Zirconia confers to the refractories the following properties: strength, toughness, and chemical resistance under severe conditions. On the other hand, magnesium oxide (MgO) is a basic refractory material characterized by its refractoriness (high melting point, around 2800 • C). This material also has a thermal conductivity of 48 W/m·K at room temperature and has a good resistance to corrosion in the presence of basic material. Magnesia refractories, which are manufactured by mixing magnesium oxide with other materials (carbon, spinel, chromite, etc.) to obtain bricks with different shapes, are used in the lining of both furnaces and ladles employed in the metallurgical industry (basic oxygen furnace (BOF), electric arc furnaces (EAF), argon-oxygen-decarburization (AOD), ladle metallurgical furnaces (LMF), cement kilns and furnaces for nonferrous materials [3]).The main consumer of magnesia-based refractory bricks is the metallurgical industry, and particularly the iron and steelmaking industry, where they are mainly used in the slag line of the LMF, in the EAF and in the BOF [4]. Other consumers of magnesia bricks (magnesia-chromite) are the submerged arc furnaces (SAF) used in the copper manufacturing process, because of the resistances to the chemical degradation by molten phases and to the abrasion, the thermal shock resistance and the mechanical strength [5].Presently, the industry requires research on refractories with better properties that are manufactured using new technologies of agglomeration (faster, cheaper and cleaner) to improve their processes, for instance, studies of: new clean techniques of sintering (solar synthesis, laser, microwave and conventional sintering), synthesis of ceramic composites, incorporation of additives to improve properties of the refractories and study of nanomaterials added to the refractory matrix [6][7][8][9][...

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“…Das [35] studied the effect of micro-and nano-spinel on MgO-C refractories sintered at 1000 • C. The results showed that adding 1 wt.% nano-spinel obtained superior properties compared to the sample containing 10 wt.% of micro-spinel. The effect of MgAl 2 O 4 and Cr 2 O 3 nanoparticles addition on the properties of MgO-CaO refractories was studied by Salman Ghasemi-Kahrizsangi et al [61,62]. Cr 2 O 3 nanoparticles improved the hydration resistance due to the formation of high hydration resistance phases such as CaCr 2 O 4 and MgCr 2 O 4 .…”

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 MgAl2O4 nanoparticles addition on the densification and properties of MgO-CaO refractories

Cited by 53 publications

References 17 publications

Effects of corundum in the development of structural, mechanical and tribological properties of raw materials for the manufacture of structural products

Effects of corundum in the development of structural, mechanical and tribological properties of raw materials for the manufacture of structural products

MgO Refractory Doped with ZrO2 Nanoparticles: Influence of Cold Isostatic and Uniaxial Pressing and Sintering Temperature in the Physical and Chemical Properties

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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