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Using a heating microscope, it was determined that the slag starts to melt around 1350 ºC. The chemical composition of the castables consist mainly of alumina (86%, 90% and 92% respectively) with a variation in material A which contains 5.8% MgO. Prismatic bars were made and sintered at 1400 C to run the hot modulus of rupture at 1000 C.
Get Price2021-2-1 · In other words, the microcracks are caused by the thermal expansion mismatch between the corundum and spinel creating a toughening effect, which improves the thermal shock resistance of the refractory castable. As a result, and as seen in Fig. 12 (b), many radial cracks exist in …
Get Price2012-7-1 · The refractory castables have generally complex heterogeneous microstructures and their physical and thermomechanical properties are highly temperature-dependent because of the complex hydration and dehydration processes . Therefore, the service conditions considerably affect the structure and properties of the refractory castables.
Get Price2014-12-1 · The microstructure and refractory properties of the prepared castables have been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), cold crushing strength, modulus of rupture and permanent linear changes (PLCs) test. Castables show good volume stability (linear change <0.7%) at 1300 °C. The outcomes of these investigations were efficacious and in …
Get Price2020-10-15 · Magnesia refractory castables are widely used in continuous casting tundish and cement rotary kilns, owing to their high refractoriness, and corrosion resistance against basic slag [, , ]. However, their low resistance to slag penetration weakens the service performances and the resultant service life in the above mentioned high-temperature industrial fields.
Get Price2019-3-10 · The effect of replacing the ball pitch with coated graphite (CG) on the microstructure, apparent porosity, physical properties, oxidation resistance, and slag corrosion resistance of Al 2 O 3 –SiC–C (ASC) refractory castables was investigated by a scanning electron microscope, an energy-dispersive X-ray spectroscope, a transmission electron microscope, and other dedicated equipment. …
Get Price2012-10-16 · It has been observed that refractory castables prepared with low amount of CAC may display heterogeneities in the form of large pores and flaws in the microstructure, which can significantly deteriorate the mechanical properties [3, 9, 10]. While silica sol is adding to refractory mixtures, the nanosized silica particles
Get Price2009-11-11 · effect during application to refractory casta-bles is scarce. Consequently, a novel alterna-tive to improve the performance of in-situ spinel-forming castables would be the addi-tion of nano-scaled Al 2O 3, MgO or Al 2O 3-MgO particles. Although the addition of nano-materials to these castables could lead to benefits such
Get Price2016-1-7 · Refractory is an inorganic, non-metallic material having those physical, mechanical properties that make them applicable to the structures or as components of a system that is exposed to alumina.
Get Price2021-5-24 · Silicon-carbide based refractory castables (SiC-RC) are prime candidates for many industrial applications involving severe conditions. Compared to other oxide refractories, they exhibit outstanding castables mechanical properties: high strength, high thermal …
Get Price2011-12-18 · the refractory castables are one of the most important ... microscope (SEM). Microstructural evaluations were performed using Cambridge S-360 SEM at 10-20 kV ... titania content downs to under 80 % and castable can not flow under its weight. The result is a castable that, at
Get Price2021-6-14 · Characterisation of microstructural evolutions in refractory castables by in situ high temperature ESEM H. Marzagui, T. Cutard∗ CROMeP, Ecole des Mines d’Albi, Campus Jarlard, F81000 Albi, France Abstract This paper deals with the characterisation of the microstructural evolutions during the first heating of two commercial refractory castables
Get PriceOver and under-watering is a very common practice within the refractory industry. In our Resco Product demonstration videos we take over and under-watering castables to the extreme. Allowing us to clearly address the issues. Adding or reducing the amount of water for the castable can be beneficial but should only be done by an expert with ...
Get Price2009-11-11 · 3-MgO Refractory Castables M.A.L. Braulio, L.R.M. Bittencourt, S.R. van der Laan, V.C. Pandolfelli The use of ultra fine particles of alumina and magnesia in Al 2O 3-MgO refractory castables could lead to a well distributed in-situ spinel (MgAl 2O 4) formation and, then, a better corrosion resistance, a higher
Get Price2016-1-7 · Refractory is an inorganic, non-metallic material having those physical, mechanical properties that make them applicable to the structures or as components of a system that is exposed to alumina.
Get Price2012-10-16 · high performance refractory castables is reducing CaO content by decreasing the amount of Calcium Aluminate Cement (CAC) as a main binder in refractory castables [3]. Recently, many researchers have focused on the influence of nanosilica as a new binder in the castables [4, 5, 6]. Colloidal silica nanoparticles (nanosilica) are
Get PriceHow to effectively improve the thermal shock resistance of refractory castables for RH furnace Jul 07, 2020. RH vacuum treatment technology is a multifunctional secondary refining method with advanced technology that can effectively improve the quality of molten steel.
Get PriceThe new generation of the low-cement concretes and CVTRB based on a binder consisting of a high-alumina cement came into existence during the evolution process of refractories as a result of the systematic studies conducted for developing and improving the conventional HAC-based concretes. The distinguishing constituents of the new concretes include the additions of ultra-fine (highly ...
Get PriceNew refractory concretes based on high-alumina cement are classified and a description of their main properties is presented. Ultra-low-cement concretes of this group are shown to have special importance. The efficiency of the technology of continuous monolithic lining of steel-teeming ladles with the use of these concretes is noted. Use of the concretes is complicated by the necessity of long ...
Get Price2020-6-25 · the refractory brick). The former (direct) dissolution mode is usually faster and more aggressive than the latter (indirect). Infiltration and dissolution depend on different parameters such as wettability, temperature, slag composition etc. In order to determine the material behavior under corrosive attack and the influence of the
Get Price2019-3-20 · Three commercial refractory castables (A, B, C) were selected with the purpose of studying their properties and to determine their corrosion mechanisms under the influence of slag from a foundry. 2.1 Production of samples Using the ball-in-hand test [10] it …
Get Price1 Introduction There is a trend to increase the use of unshaped refractory castables in various industries like steel-making, cement production, energy production and waste incineration. In several applications, they are more economical and easier to use than shaped refractories and they can exhibit excellent mechanical properties.
Get Price2019-8-22 · Key physical properties of refractory materials used in high-temperature corrosive applications include density, porosity, and strength. More appropriately, the strength at temperature is one of the key indicators of performance in service. The data in Table 2 below shows a comparison of various castables with newly developed sol bonded products.
Get Price2019-8-25 · The trend in refractory monolithic design has long been aimed towards reducing the cement content of the compositions. Concurrently, refinement of the particle size distribution, additives, and dispersants used have been optimised over the years. As a result, excellent properties of ultra-low cement castables have been achieved.
Get Price2010-2-1 · Refractory castables were prepared from 85 mass% graded SiC slab waste as an aggregate and 15 mass% of either 50% or 80% alumina cement using the suitable amount of gauging water. The prepared castable samples were subjected to different firing temperatures 20°C, 800°C, 1000°C, 1300°C , 1400°C, 1500°C and 1600°C.
Get Price2021-6-3 · spinel refractory castables containing CMA aggregates were evaluated contrastively. The results demonstrated that the incorporation of CMA aggregates can significantly improve thermal shock resistance and thermal fatigue resistance of castables, although companying with slight decrease in the bulk density and strength.
Get PriceAiming at optimizing properties of alumina-spinel refractory castables, coarse corundum particles were replaced partially with the particles of a novel porous multi-component CMA (CaO-MgO-Al2O3) aggregate in the same size. Properties including the bulk density, apparent porosity, strength, slag corrosion resistance, thermal shock resistance and thermal fatigue resistance of alumina-spinel ...
Get Price2007-1-22 · M/Phil by Practice research activities being undertaken under the current title: ... Refractory concretes are well known to ceramicists but largely only for their ... Monolithics are generally described as gun mixes and castables used as linings and coatings normally fired in situ.
Get Price2019-8-25 · The trend in refractory monolithic design has long been aimed towards reducing the cement content of the compositions. Concurrently, refinement of the particle size distribution, additives, and dispersants used have been optimised over the years. As a result, excellent properties of ultra-low cement castables have been achieved.
Get Price2019-8-22 · Key physical properties of refractory materials used in high-temperature corrosive applications include density, porosity, and strength. More appropriately, the strength at temperature is one of the key indicators of performance in service. The data in Table 2 below shows a comparison of various castables with newly developed sol bonded products.
Get Price2021-6-1 · Aiming at optimizing properties of alumina-spinel refractory castables, coarse corundum particles were replaced partially with the particles of a novel porous multi-component CMA (CaO-MgO-Al 2 O 3) aggregate in the same size.Properties including the bulk density, apparent porosity, strength, slag corrosion resistance, thermal shock resistance and thermal fatigue resistance of alumina-spinel ...
Get PriceRefractory castables in this investigation contained (a) aggregate made from unused high‐duty fire‐clay brick or calcined Kentucky flint clay and (b) domestic or imported high‐alumina hydraulic cement. The bulk densities were determined for different mixtures of grog passing through (a) a 3/8 in. sieve and retained on a No. 10 sieve, (b) a No. 10 on a No. 40, and (c) a No. 40 (including ...
Get Price2021-6-3 · spinel refractory castables containing CMA aggregates were evaluated contrastively. The results demonstrated that the incorporation of CMA aggregates can significantly improve thermal shock resistance and thermal fatigue resistance of castables, although companying with slight decrease in the bulk density and strength.
Get PriceAiming at optimizing properties of alumina-spinel refractory castables, coarse corundum particles were replaced partially with the particles of a novel porous multi-component CMA (CaO-MgO-Al2O3) aggregate in the same size. Properties including the bulk density, apparent porosity, strength, slag corrosion resistance, thermal shock resistance and thermal fatigue resistance of alumina-spinel ...
Get Price2007-1-22 · M/Phil by Practice research activities being undertaken under the current title: ... Refractory concretes are well known to ceramicists but largely only for their ... Monolithics are generally described as gun mixes and castables used as linings and coatings normally fired in situ.
Get Price2021-7-5 · Refractory castables exhibit very low fracture strain levels when subjected to tension or bending. The main objective of this work is to show that 3-D digital image correlation (3-D DIC) allows such low strain levels to be measured. Compared to mechanical extensometer mea-
Get Price2016-9-7 · Insulating castable products which are deemed easy to install are consistent in production and can be applied under a wide variety of conditions. Cast process crushed IFB based castables have a consistent density and particle size enabling tight control on water addition resulting in a smooth castable with good flow characteristics.
Get Price2019-8-22 · Key physical properties of refractory materials used in high-temperature corrosive applications include density, porosity, and strength. More appropriately, the strength at temperature is one of the key indicators of performance in service. The data in Table 2 below shows a comparison of various castables with newly developed sol bonded products.
Get Price2010-11-10 · flowing refractory castables. Additionally, the physical and mechanical properties of the refractory castables as well as their microstructure at high temperatures are investigated. For this purpose, four commercial dispersants such as; poly carboxylate ether (PCE), sodium polymethacrylate acid (PA) and sodium
Get Price2015-3-5 · Alumina-magnesia refractory castables have been widely used in the wall and bottom impact pad of steel ladles. The properties of alumina-magnesia refractory castables with SnO 2 additive in 0 - 5 wt% range were investigated. The phase composition, microstructure, physical and mechanical properties of these refractories were studied.
Get Price2017-8-23 · NANO IDEA Open Access Densification characteristics of chromia/alumina castables by particle size distribution Jingming Zhao1, Taesuk Kim1, Gichul Kim1, Kyuhong Hwang1* and Dongsik Bae2 Abstract The quality of the refractories applied on integrated gasification combined cycle should be a key factor that affects
Get PriceAiming at optimizing properties of alumina-spinel refractory castables, coarse corundum particles were replaced partially with the particles of a novel porous multi-component CMA (CaO-MgO-Al2O3) aggregate in the same size. Properties including the bulk density, apparent porosity, strength, slag corrosion resistance, thermal shock resistance and thermal fatigue resistance of alumina-spinel ...
Get Price2011-6-3 · Apart from this, it is also well known that the green strength of castables determines the susceptibility of the refractory lining to support its own weight under the mechanical stresses developed during drying. Therefore it is a common practice to apply high
Get Price2021-4-17 · ULTRA LOW CEMENT REFRACTORY CASTABLES by Cem Gogtas The University of Wisconsin-Milwaukee,2012 Under the Supervision of Professor Hugo Lopez The main goal of this research is to develop high strength high toughness nano-ZrO 2 reinforced self flow low cement (5%) and ultra low cement (3 and 1%) castables based on tabular alumina.
Get PriceHead of Refractories. Phone. work. +49 241 80 94988. Email. E-Mail. Send Email. Refractory materials play a key role in many areas such as metal, glass and cement production. In order to minimize wear, the material must be optimally adapted to the mechanical, thermomechanical and corrosive loads.
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