NON-CemeNt refraCtOry CaStableS CONtaiNiNg NaNO
The microstructure of high alumina gel-bonded castable containing 10 wt. nano-silica sol after drying at 110°C is shown on Figure 7. This figure reveals that the microstructure of these castables consisting of tabular aggregates (TA) and agglomerates of fine alumina microsilica and colloidal silica in the matrix.
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Analysis of liquid metal foams through X-ray radioscopy
Jul 04 2014 · Microstructures of refractory castables prepared with sol–gel additives. Numerical study of the stress state of a deformation twin in magnesium. Recent Publications. Influence of supporting amorphous carbon film thickness on measured strain variation within a nanoparticle
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MICROSTRUCTURE AND PROPERTIES OF COLLOIDAL SILICA
Micro silica which is a by-product of ferro- silicon manufacture when present in the bond system of refractory castable batches reduces the amount of mixing
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Properties of silica sol bonded corundum‐spinel castables
At the same time silica sol bonded samples had high strength in medium temperature. This is because that the closer proximity of silica sol and alumina powder and the high activity of nanometer SiO 2 in silica sol are beneficial for the reaction of SiO 2 and Al 2 O 3 to generate mullite needed for reinforcement of castables matrix.
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Next Generation Carbon-Containing Refractory Composites
Carbon-containing refractory bricks are used extensively in the steel industry worldwide. Since the first generation became commercially available in the 1970 s their processing microstructures and properties have been improved dramatically and the service lives of industrial furnaces have thus been extended substantially. In addition to the work on carboncontaining refractory bricks
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Synthesis and Characterization of Alumina Sol and Its Use
Dec 26 2014 · Alumina sol was prepared from inorganic precursors and characterized for its solid content particle size analysis DSC‐TG phase formation on calcination etc. The sol was used as sole binder in high‐alumina refractory castables with different particle size distributions (PSDs) by varying distribution coefficients as per Dinger and Funk
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Nano mullite bonded refractory castable composition for
Aug 15 2016 · Mullite sol is prepared by wet chemical route and is characterized by its solid content particle size thermal analysis phase development with temperature microstructure etc. This sol is used at two different percentages in high alumina castable compositions with two different particle size distribution patterns.
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Microstructure and physical properties of steel-ladle
Abstract Three different castables were prepared as steel-ladle purging-plug refractory materials corundum-based low-cement castable (C-LCC) corundum–spinel-based low-cement castable (C-S-LCC) and no-cement corundum–spinel castable (C-S-NCC) (hydratable alu-mina ρ-Al2O3 bonded). The properties of these castables were characterized with
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Effect of silica sol of different routes on the properties
Effect of silica sol on low cement castables 229 Table 3 shows that compressive strength values are increased by adding silica sol and the values are maxi-mum in case of systems A and C. The ultrafine particles are dispersed between the refractory grains and formed a coagulated hydraulic bond in presence of silica sol which
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Thermal Conductivity of Sol-Gel Bonded Castables
The silica-alumina sol bonding agent prepared by the sol gel route from ethyl silicate and aluminium isopropanol was utilized in the refractory castables. The influence of structure on the heat transfer has been investigated using different sorts of refractory matrix.
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Alumina-Rich Castables Microstructural and
2.1. Refractory Materials Two types of matrix from refractory castables with comparable microstructures and di erent mineral compositions were targeted. This allowed us to isolate the e ect of calcium hexa-aluminate as a refractory component regarding its potential to replace alpha alumina for specific biomass applications.
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A Review of Bond Systems for Monolithic Castable Refractories
May 01 1995 · al castables. Current refractory technology now covers a huge range of castables that can be applied by a wide range of installa-tion technologies and are suitable for an ever-increasing range of applications. The types of bonding systems in use can be seg-mented into a number of broad categories 1 and within each category there exists a
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Effect of silica sol of different routes on the properties
Effect of silica sol on low cement castables 229 Table 3 shows that compressive strength values are increased by adding silica sol and the values are maxi-mum in case of systems A and C. The ultrafine particles are dispersed between the refractory grains and formed a coagulated hydraulic bond in presence of silica sol which
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Analysis of liquid metal foams through X-ray radioscopy
Jul 04 2014 · Microstructures of refractory castables prepared with sol–gel additives. Numerical study of the stress state of a deformation twin in magnesium. Recent Publications. Influence of supporting amorphous carbon film thickness on measured strain variation within a nanoparticle
Get PriceEFFECTS OF LIGHTWEIGHT MULLITE-SILICA RICH GLASS
of castables The castables were prepared with different light-weight aggregates but the same matrix. Three castables were named as EC FC and GC according to their corresponding aggregates. The contents of aggregate and powder in the castable mixture were 67 vol. and 33 vol. respectively. 6 calcium aluminate was used as a binder.
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GBAAbrasion resistant refractory castable
A refractory composition characterized by relatively high abrasion resistance good flowability and long working time comprises 0.5 to 5 by weight of volatilized silica 3.0 and 15 by weight of -65 mesh alumna and 10 to 40 by weight of calcium aluminate cement the balance being a refractory agreggate such as silica alumina or fireclay.
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Synthesis and Characterization of Alumina Sol and Its Use
Nov 01 2015 · Alumina sol was prepared from inorganic precursors and characterized for its solid content particle size analysis DSC‐TG phase formation on calcination etc. The sol was used as sole binder in high‐alumina refractory castables with different particle size distributions (PSDs) by varying distribution coefficients as per Dinger and Funk model. The castables were processed conventionally
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Microstructures of refractory castables prepared with sol
Jan 01 2003 · For the ULCC composition alumina silica mullite and spinel sols were applied as additives. The application of silica sol is quite common in refractory castables whereas the use of alumina mullite and spinel sols (prepared from cheaper precursor) in high alumina based castables has been discussed by some authors .For the LCC composition spinel gels prepared from two different
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Thermal Conductivity of Sol-Gel Bonded Castables
The silica-alumina sol bonding agent prepared by the sol gel route from ethyl silicate and aluminium isopropanol was utilized in the refractory castables. The influence of structure on the heat transfer has been investigated using different sorts of refractory matrix.
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FORMATION OF HEXA-ALUMINATE SOLID SOLUTION PHASES
Refractory castables based on Tabular alumina T60/T64 (C1) and white fused alumina (WFA) (C2) were prepared in addition to the synthetic raw mixtures. As shown in Tab. 2 the castables contain 12 wt. pre-formed spinel AR 78 which is a sintered spinel with a phase composition of 100 alumina-rich non-stochiometric spinel.
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NON-CemeNt refraCtOry CaStableS CONtaiNiNg NaNO
The microstructure of high alumina gel-bonded castable containing 10 wt. nano-silica sol after drying at 110°C is shown on Figure 7. This figure reveals that the microstructure of these castables consisting of tabular aggregates (TA) and agglomerates of fine alumina microsilica and colloidal silica in the matrix.
Get PriceINFLUENCE OF NANO SILICA ON PROPERTIES AND
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
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Influence of Additives on Slag Resistance of Al2O3‐SiO2
Jan 20 2005 · The microstructures of Al 2 O 3 –SiO 2 –SiC–C refractory matrices with aluminum silicon Si 3 N 4 BN B 2 O 3 and B 4 C additives are characterized before and after a crucible slag test and the phases present are compared to those expected at thermodynamic equilibrium. The carbon content dominates the resistance to CaO–MgO–Al 2 O 3 –SiO 2 slag penetration while the viscosity
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Microstructure and physical properties of steel-ladle
Abstract Three different castables were prepared as steel-ladle purging-plug refractory materials corundum-based low-cement castable (C-LCC) corundum–spinel-based low-cement castable (C-S-LCC) and no-cement corundum–spinel castable (C-S-NCC) (hydratable alu-mina ρ-Al2O3 bonded). The properties of these castables were characterized with
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At the same time silica sol bonded samples had high strength in medium temperature. This is because that the closer proximity of silica sol and alumina powder and the high activity of nanometer SiO 2 in silica sol are beneficial for the reaction of SiO 2 and Al 2 O 3 to generate mullite needed for reinforcement of castables matrix.
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Microstructures of refractory castables prepared with sol
Microstructures of refractory castables prepared with sol‐gel additives. SEM photograph of polished surface of ULC castable prepared with silica sol additive and fired at 1500 C.
Get PriceEffect of preformed and in situ spinels on microstructure
Jan 01 2004 · An in situ spinel was also prepared via the sol–gel route characterized with respect to p H solid content PSD XRD and incorporated in different concentrations to the same castable. These two types of fired specimens were characterized and compared in terms of BD AP CCS flexural strength volume change and thermal shock resistance.
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Alumina-Rich Castables Microstructural and
2.1. Refractory Materials Two types of matrix from refractory castables with comparable microstructures and di erent mineral compositions were targeted. This allowed us to isolate the e ect of calcium hexa-aluminate as a refractory component regarding its potential to replace alpha alumina for specific biomass applications.
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Effect of Alumina Sol in No-Cement Refractory Castables
This paper deals with the performance of alumina sol prepared from a cheaper precursor and used as a bonding agent in no-cement refractory castables fabricated by simple tapping technique. The physical properties of sol-bonded-castables indicate a significant improvement at elevated temperatures.
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3. Microstructures of refractory castables prepared with sol gel additives Ceramics International 29(6)(2003) 4. In situ spinel bonded refractory castable in relation to coprecipitation and sol-gel derived spinel forming agents Ceramics International 29(8)(2003) 5.
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