High Performance Castable Refractories for Cupola
· bonding matrix that is mullite based and therefore more refractory. Additionally the elimination of metallic additions that can lead to the evolution of hydrogen gas during curing is an important consideration reduce/eliminate these risks associated with these additives. Colloidal silica is a colloidal dispersion of nanometer sized particles.
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Castable refractory concretes International Materials
· The development of the low cement systems is discussed in terms of particle packing dispersion and rheology highlighting the influence of colloidal matrix additions of silica and alumina. Recent developments including cement free self-flowing shotcreting and basic castables are described and the potential for carbon-containing systems
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Reasons for crack propagation and strength loss in
· Reasons for crack propagation and strength loss in refractory castables based on changes in their chemical compositions and micromorphologies with heating special focus on the large blocks silica fume and colloidal suspen-sions etc.). Therefore when cement is used in a refractory castable s matrix the amount of cement as
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Colloidal SilicaREMET
Colloidal Silica Binders. REMASOL® Colloidal Silica binders are aqueous colloidal dispersions of silica particles. The silica particles in REMASOL® are non-crystalline have a high specific surface area (One gram of REMASOL® colloidal silica has a surface area of between 100 and 400 square meters ) and are negatively charged particles which have been stabilized with sodium hydroxide.
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INFLUENCE OF NANO SILICA ON PROPERTIES AND
Abstract Colloidal silica bonded refractory castables have been developed recently. It was found that colloidal silica is one of the best binders can substitute other binders such as cement in No Cement Castable (NCC) and Ultra Low Cement Castable (ULCC) refractories. Also composition of colloidal silica with appropriate additives resulted in a gel
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Materials Free Full-Text Effect of Colloidal Silica on
The effect of colloidal silica (CS) on the hydrate phases and microstructure evolution of calcium aluminate cement (CAC) was investigated. Samples hydrated with CS were obtained and characterized by X-ray diffraction (XRD) Field Emission Scanning Electron Microscopy (FESEM) Fourier Transform Infrared spectroscopy (FT-IR) hydration heat measurement and Nuclear Magnetic Resonance (NMR).
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ADVANTAGES OF USING GEL BOND AND COLLOIDAL
· refractory technology. Since the type of colloidal silica used in refractories is available commercially it became easy for many to take advantage of this technology. In lieu of conventional binders colloidal silica can be used as bonding agent in all type of monolithic refractories such as castables ramming and gunning mixes.
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MICROSTRUCTURE AND PROPERTIES OF COLLOIDAL
· colloidal silica gelling rate is maximum (around pH 5). In this context colloidal silica has been pointed out as an alternative for a calcium-free binder agent for refractory castables 6 . In the present research the influences of colloidal silica addition on casting process as well as properties are investigated. 2. EXPERIMENTAL PROCEDURE 2. 1.
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INFLUENCE OF NANO SILICA ON PROPERTIES AND
Abstract Colloidal silica bonded refractory castables have been developed recently. It was found that colloidal silicais one of the best binders can substitute other binders such as cement in No Cement Castable (NCC) and Ultra LowCement Castable (ULCC) refractories. Also composition of colloidal silica with appropriate additives resulted in a gelform which makes the initial strength. Moreover the nano size silica particles are extremely reactive in high aluminacastables and may encourage the mullite formation in the microstructure. In the current study four castables wereprepared. The sample containing 6wt microsilica was a reference then microsilica was replaced by different amountof colloidal silica
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Castable Refractory Low Cement Conventional
Castable Refractory for High Heat Applications Castables/Monolithic refractories are utilized across numerous industries including steel aluminum cement lime HPI/petrochem etc. It is considered an "unshaped" mix with a particular percentage of water for optimal properties.
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Physical and mechanical properties of low ultralow and
the search for refractory castables without cement for more demanding applications the no cement variety was developed using hydratable alumina colloidal silica or colloidal alumina as binding agents. Therefore the modern refractory castables are able to present creep and corrosion
Get PriceCastable refractory concretes International Materials
· The development of the low cement systems is discussed in terms of particle packing dispersion and rheology highlighting the influence of colloidal matrix additions of silica and alumina. Recent developments including cement free self-flowing shotcreting and basic castables are described and the potential for carbon-containing systems
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Nano mullite bonded refractory castable composition for
· A combined binding system for refractory castables based on colloidal silica and hydratable alumina
Get PriceEffect of Alumina and Silica on the Hydration Behavior of
· The castables consisted of dead-burned magnesia with additions of calcined and/or tabular aluminas or microsilica to the matrix. The addition of alumina in combination with magnesia increased the hydration rate during the drying of the castable due to a lower permeability of the casted piece.
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NON-CemeNt refraCtOry CaStableS CONtaiNiNg NaNO
· pumpable refractory products have been developed based on a patented sol-gel bonding nanotechnology containing no CAC. Nano-silica is one of the most popular binders for refractory monolithic and castable applications. Nano-silica sol or colloidal silica is a stable water-based suspension containing up to 40 wt. of nano-metric
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Magneco/Metrel Inc. Metpump RefractoryWelcome
Magneco/Metrel Inc. Metpump RefractoryWelcome. Origin. In 1981 Magneco/Metrel was formed by a merger of two small companies Magneco who made fired shapes and Metrel who made monolithic refractories. The concentration was to be on innovation and the creation of value to the customer by lowering the cost of his production.
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Refractories and Classification of RefractoriesIspatGuru
· Classification based on thermal conductivity. Based on thermal conductivity refractories can be (i) conducting such as SiC ZrC (ii) non conducting such as silica alumina or (iii) insulating refractories. The function of insulating refractory is to reduce the rate of heat flow (heat loss) through the walls of furnaces.
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Effect of Alumina and Silica on the Hydration Behavior of
· The castables consisted of dead-burned magnesia with additions of calcined and/or tabular aluminas or microsilica to the matrix. The addition of alumina in combination with magnesia increased the hydration rate during the drying of the castable due to a lower permeability of the casted piece.
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Reasons for crack propagation and strength loss in
· Reasons for crack propagation and strength loss in refractory castables based on changes in their chemical compositions and micromorphologies with heating special focus on the large blocks silica fume and colloidal suspen-sions etc.). Therefore when cement is used in a refractory castable s matrix the amount of cement as
Get PriceColloquiumICR 2020
Correlation between the high temperature thermal shock resistance of cement and colloidal silica bonded high alumina refractory castables and their thermomechanical properties. Influence and determination of slag infiltration and the suction behavior of casted carbon-bonded refractory materials based on SiC. view presentation. DEVELOPMENT
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MICROSTRUCTURE AND PROPERTIES OF COLLOIDAL
Abstract Efforts have been carried out in order to use microsilica to develop a forsterite bond rather than other typesof binders in the basic refractory castables. According to the higher drying rate and sinterability of colloidal silica ithas been proposed in the recent years. In the present work effects of replacement of microsilica by colloidal silicaevolution of forsterite bond have been studied in magnesia based refractory castables. In this way Physical propertiesof prepared samples with different amount of colloidal silica
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Colloidal silica and hydratable alumina as refractory
Colloidal silica and hydratable alumina can be pointed out as important substitutes to the calcium aluminate cements as calcium-free binders for refractory castables. Based on the advantages and drawbacks of these binders it is reasonable to consider that their combination could maximize the advantages and reduce the negative aspects observed
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Refractories and Classification of RefractoriesIspatGuru
· Classification based on thermal conductivity. Based on thermal conductivity refractories can be (i) conducting such as SiC ZrC (ii) non conducting such as silica alumina or (iii) insulating refractories. The function of insulating refractory is to reduce the rate of heat flow (heat loss) through the walls of furnaces.
Get PriceINFLUENCE OF NANO SILICA ON PROPERTIES AND
Abstract Colloidal silica bonded refractory castables have been developed recently. It was found that colloidal silica is one of the best binders can substitute other binders such as cement in No Cement Castable (NCC) and Ultra Low Cement Castable (ULCC) refractories. Also composition of colloidal silica with appropriate additives resulted in a gel
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Advantages of using Gel Bond and Colloidal Silica in
· Colloidal silica being more viscous than the water help to maintain more separation of refractory particles which in turn provide better thermal shock resistance. Better chemical resistance. Because of the various superior properties of gel bond castables / pumpables as described above they yield longer campaign life less downtime and so
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Refractory MonolithicsAMANA ACID BRICKS
The results showed higher performance for the colloidal silica bonded castables suggesting the use of this bonding system in the development of refractory castables for erosion wear applications. The ratio between the hot modulus of rupture and the eroded volume has also been shown as a relevant technique for the refractories selection in such
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Agentes ligantes para concretos refratários sílica
Colloidal silica and hydratable alumina can be pointed out as important substitutes to the calcium aluminate cements as calcium-free binders for refractory castables. Based on the advantages and drawbacks of these binders it is reasonable to consider that their combination could maximize the advantages and reduce the negative aspects observed when they are individually used.
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Nano mullite bonded refractory castable composition for
· The materials used in the preparation of mullite sol were aluminum nitrate nonahydrate (Fisher Scientific India make purity>98 ) as alumina source silica sol (Dr. Khans laboratory India make 30 SiO 2) as silica source and ammonia solution (Fisher Scientific India make 25 sp. gr. 0.91).Aluminum nitrate in the stoichiometric ratio (alumina silica 3 2) was dissolved in silica sol and
Get PriceCastable refractory concretes International Materials
· The development of the low cement systems is discussed in terms of particle packing dispersion and rheology highlighting the influence of colloidal matrix additions of silica and alumina. Recent developments including cement free self-flowing shotcreting and basic castables are described and the potential for carbon-containing systems
Get PriceMicrosilica-Gel Bonded Refractory Castables with Improved
· The chemistry of silica Solubility polymerisation colloid and surface properties and biochemistry. Chichester 1979 11 Nouri-Khezrabad M. et al. Developing nanobonded refractory castables with enhanced green mechanical properties. Ceramics Int. 41 (2015) 3051–3057 12 Myhre B. Fan H. Gel bonded castables based on microsilica as
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