Incorporating Nano-silica as a Binder to Improve Corrosion
Abstract. In this study four types of castables as calcium-aluminate cement (CAC)-bonded and nano-silica (NS)-bonded castables based on tabular-alumina and bauxite aggregates were prepared to investigate the replacement of the calcium-aluminate cement by NS.
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An experimental investigation of hydration mechanism of
Aug 16 2018 · Magnesia (MgO) is widely used in the production of refractory materials due to its ultra-high melting point and ability to form the binding system based on M–S–H (M≡MgO S≡SiO 2 H≡H 2 O) phase under moist conditions and in the presence of for example silica fume 1 2 3 4 .Magnesium oxide with high chemical activity can be obtained by optimizing the technological parameters
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Year 2009 Volume 29Techna Group
The effects of nano calcium carbonate on the properties of corundum-based castables were investigated. White fused alumina ultra-fine alumina nano calcium carbonate calcium aluminate cement and hydratable alumina were used as raw materials. The results show that the phase compositions and phase changes of the mixture with nano calcium
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(PDF) The Effect of Nanosized Carbon Black on the Physical
Castable without CB contains two sources of gel content namely alumina gel (the hydration where σF is ultimate bending strength after gradual roasting product of hydratable alumina) and silica gel which fills the at 850 C σF3C is ultimate bending strength after three pores and voids however castables containing CB show the heating
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Nanotechnology in Refractory Castables — An Overview
May 30 2018 · The use of colloidal silica as an alternative binder has improved this condition and is being practiced commercially but restrictions on high temperature applications have encouraged the use of other colloidal systems namely alumina mullite spinel sols etc. Nanoparticles are also present in the castable system from binders like hydratable
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Improved Corrosion Resistance of Alumina-Spinel Castable
Sep 09 2011 · materials by using alumina-based binder agents hydratable alumina and colloidal alumina. The results highlighted a reduced corroded area after the slag tests for the latter which was most likely associ-ated with the decrease in the average pore size. Therefore the use of these nano-scaled alumina particles points out a promising tech-
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INFLUENCE OF NANO SILICA ON PROPERTIES AND
refractory containing both silica sol and CAC 13 . The purpose of this research is to investigate the influence of colloidal silica particles (nanosilica) on properties and microstructure of high-alumina ultra low cement refractory castables. 2. EXPERIMENTAL PROCEDURE 2. 1. Materials The raw materials used in this work are graded
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Continuous casting-tundish technologySlideShare
CONTINUOUS CASTING Continuous casting also called strand casting is the process whereby molten metal is solidified into a semifinished billet bloom or slab for subsequent rolling in the finishing mills. 4. Most basic metals are mass-produced using a continuous casting process including over 500 million tons of steel 20 million tons of
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Reactive processing of ceramic binding systems for
The general applied objective of this project is to develop hydratable alumina-bonded castables of properties comparable to the high-temperature fired basic bricks. This work is focused on improving the sintering of the ceramic binding systems at relatively low temperatures ( 1300°C) through incorporation of ultrafine powders. Ultrafine magnesium aluminate spinel powders were synthesized
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A REVIEW OF REFRACTORY BOND SYSTEMS FOR
micron fraction is demonstrated that the use of a spherical alumina instead of plate-like reactive alumina eliminates dilatancy. Thus by using spherical alumina the tendency to dilatant behavior can be eliminated also in silica-free alumina castable compositions.
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Reactive processing of ceramic binding systems for
The general applied objective of this project is to develop hydratable alumina-bonded castables of properties comparable to the high-temperature fired basic bricks. This work is focused on improving the sintering of the ceramic binding systems at relatively low temperatures ( 1300°C) through incorporation of ultrafine powders. Ultrafine magnesium aluminate spinel powders were synthesized
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Research and simulation of hydrated alumina homogeneous
an alumina sol.3‒5 The colloidal solution of hydrated alumina (alumina sol) in its behavior during the production of composite materials and in some of its physicochemical properties differs little from silica sol. The technology for producing materials based on it practically does not differ from the technology of obtaining composites based
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Incorporating Nano-silica as a Binder to Improve Corrosion
Oct 04 2012 · In this study four types of castables as calcium-aluminate cement (CAC)-bonded and nano-silica (NS)-bonded castables based on tabular-alumina and bauxite aggregates were prepared to investigate the replacement of the calcium-aluminate cement by NS. All samples were allowed to dry at 110 °C then fired at 800 and 1200 °C. Bulk density and apparent porosity of samples were measured.
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The Effect of Nano Silica on Mechanical Properties of
The numerous exploitative works have been done since two decades by utilizing Nano materials such as Nano silica Nano alumina etc. to accomplish a high strength and to increase the durability of concrete. On the principle of environmental sustainability fly ash is used for fractional substitution of cement. The present work concentrates principally towards the addition of Nano silica
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Recent Developments in the Synthesis of Supported
Using this method 2 wt Pt was deposited on carbon (PZC = 2 pH 13) silica (PZC = 4 pH 13) and alumina (PZC = 8 pH 1). Small particles between 1.5 and 3 nm in size were obtained much smaller compared to those from a conventional dry impregnation whereby the pH of the impregnating solution was not optimized.
Get PriceGBARefractory compositionGoogle Patents
A refractory composition containing from 0.3 to 10 by weight of lightly fired magnesia and from 3 to 30 by weight of microfine calcined alumina together with aggregate in the form of e.g. sintered alumina fused alumina and MgO-Al2O3 spinel or of sintered alumina and MgO-Al2O3 spinel or of fused alumina and MgO-Al2O3 spinel can be cast as a monolithic refractory which has excellent
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نانوفناوری در دیرگدازهای ریختنی
Different nanopowders and colloidal suspensions have been utilized to improve the properties of refractory castables. Various studies have been carried out worldwide with nano scaled binders such as hydratable alumina (HA) colloidal alumina (CA) colloidal silica (CS) micro silica etc. to improve the thermo mechanical properties of
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Materials Free Full-Text Effect of Colloidal Silica on
Though some research has been carried out on the effect of silica fume or nano-silica on hydration behavior the influence of colloidal silica on hydration behavior is not clear especially as systematical research on the hydration mechanism of CAC cement with colloidal silica is little reported.
Get PriceMaterials Free Full-Text Effect of Colloidal Silica on
Though some research has been carried out on the effect of silica fume or nano-silica on hydration behavior the influence of colloidal silica on hydration behavior is not clear especially as systematical research on the hydration mechanism of CAC cement with colloidal silica is little reported.
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Continuous casting-tundish technologySlideShare
CONTINUOUS CASTING Continuous casting also called strand casting is the process whereby molten metal is solidified into a semifinished billet bloom or slab for subsequent rolling in the finishing mills. 4. Most basic metals are mass-produced using a continuous casting process including over 500 million tons of steel 20 million tons of
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USACastable refractory containing alumina coarse
A castable refractory which comprises a matrix making up 100 wt in total composed of 3-20 wt of magnesia clinker having a particle diameter smaller than 0.21 mm and containing more than 95 wt of MgO and 0.5-3.0 wt of alumina cement in terms of CaO with the remainder being alumina and 0.1-3 wt of ultrafine powder of amorphous silica and 3-9 wt of alumina coarse grains having a
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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
Get PriceTitle and Author Table Presentation List (Tentative) Title
Refractory Management Program for Smelting Furnaces Mitchell Henstock Afshin Sadri Winnie Ying Design of Hydratable Alumina-bonded Castables with Optimized Drying Behavior A. P. Luz B. P. Bezerra M. H. Moreira V. C. Pandolfelli The Application of Ti-Max Phase in Low Carbon Refractories and Elucidating Its Related Role
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Nanotechnologie in feuerfesten Gießmassen Ein Überblick
The use of colloidal silica as an alternative binder has improved this condition and is being practiced commercially but restrictions on high temperature applications have encouraged the use of other colloidal systems namely alumina mullite spinel sols etc. Nanoparticles are also present in the castable system from binders like hydratable
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USACastable refractory rich with alumina coarse
A castable refractory which comprises a matrix making up 100 wt in total composed of 3-20 wt of magnesia clinker having a particle diameter smaller than 0.21 mm and containing more than 95 wt of MgO and 0.5-3.0 wt of alumina cement in terms of CaO with the remainder being alumina and 0.1-3 wt of ultrafine powder of amorphous silica and 41-100 wt of alumina coarse grains having
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Filter Coatings Based on Combination of Nanomaterials for
Jul 23 2019 · Next ≈40 kg of commercially available 42CrMo4 steel (AISI 4142) were melted in a special crucible this consisted of hydratable alumina‐bonded alumina/alumina‐magnesia‐spinel material without any silica calcia or further additions (to prevent unwanted reactions during the experiment) presintered at 1600 °C for 2 h.
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