Designing Colloidal Silica-Bonded Porous Structures of In
· Abstract Colloidal silica (CS) is a promising raw material for refractory castable ceramics. It consists of stable suspensions of synthetic amorphous silica nanoparticles that behave simultaneously as liquid medium and binder for ceramic particles and as a porogenic agent and highly reactive source of silica to promote in-situ reactions. The setting mechanism of CS balances two opposite effects.
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Microstructure and reactivity evolution of colloidal
· Therefore to investigate the possibility of mullite phase forms at relatively low temperatures in the presence of silica sol a mixture of the dried silica gel powder and tabular alumina fines (m (Al 2 O 3) m (SiO 2) = 3 2) has been fired at °C for 3 h both in air and in reducing atmosphere.
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New developments in non-cement refractories -
· bonded castables Usual Cement Castables NANOBOND Type regular medium low cement or ultra-low cement castable no cement castable Mixing Agent water special liquid binder Variation of setting time usual additives amount on liquid binder Available raw materials no technical restrictions chamotte bauxite tabular alumina andalusite fused
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Use of the sol-gel method for the production of no cement
· The most used colloidal sol is colloidal silica sol especially thanks to relative low price in comparison to alumina and titanium sols. Main aim of this thesis is design of no cement castable based on sol-gel method with emphasis on improving physical-mechanical and refractory properties in comparison to ultra-low cement castable.
Get PriceSilica Sol Bonded High Alumina Castable Effect of
Silica sol bonded high alumina castables with different particles size distributions were prepared using white tabular alumina (WTA) grains and fines (Almatis/IN) react-Tab. 1 Physico-chemical properties of different starting materials Constituent WTA Grain WTA Fines Reactive Alumina Fine Silica Sol SiO 2 0 08 0 11 0 03 29 8 Al
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Use of the sol-gel method for the production of no cement
· The most used colloidal sol is colloidal silica sol especially thanks to relative low price in comparison to alumina and titanium sols. Main aim of this thesis is design of no cement castable based on sol-gel method with emphasis on improving physical-mechanical and refractory properties in comparison to ultra-low cement castable.
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Microsilica-Gel Bonded Refractory Castables with Improved
· Silica-sol bonded no-cement refractory castables are attractive to the industry due to their high temperature performance and fast dry-out in comparison to low cement castables. However these castables are not widely used due to inadequate green strength and long settime/complex set-behaviour.
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Silica Sol Bonded High Alumina Castable Effect of
Silica sol bonded high alumina castables with different particles size distributions were prepared using white tabular alumina (WTA) grains and fines (Almatis/IN) react-Tab. 1 Physico-chemical properties of different starting materials Constituent WTA Grain WTA Fines Reactive Alumina Fine Silica Sol SiO 2 0 08 0 11 0 03 29 8 Al
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Developments in Monolithic ProductsAmerica s Cement
· No Cement Systems Comparison Temperature sensitivity storage installation (water) (silica sol ≥ 5 °C) (water) Drying out and heating-up safety Apparent porosity / alkali resistance Permanent linear change Microstructural strength / abrasion resistance Microstructural elasticity / TSR Ratio microstructural strength/elasticity
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Incorporating Nano-silica as a Binder to Improve Corrosion
· 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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Effects of silica sol on the preparation and high
· Silicon oxynitride bonded SiC castables (SS castables) were prepared via in-situ nitridation at 1420 °C for 6 h in flowing N 2 using black SiC SiO 2 fume and Si powder as starting materials and silica sol as a binder. Phase compositions and microstructures of as-prepared SS castables were characterized and the effects of silica sol s type and amount on their cold and hot moduli of rupture
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Comparison of Silica-sol and Low Cement Bonded Tabular
· Silica-sol bonded castables have been in the market for many years. It is known that silica sol bonded castables are easier to dry when compared to low cement castables. For this reason silica sol bonded castables experienced a stronger focus especially in the recent years. Time is an important factor in refractory installations. Therefore a fast heat up of monolithic linings is often desired by the
Get PriceREFRACTORY 96 Proceedings of the International
· 34 Research and Application of Pre-fabrication of Low Cement Corundum Product 296 Zhang Hanli 35. Development and Application of High Quality Silica Brick for Coke Oven 299 Wang Hongmei. Wei Jianguo Shu Guiying Section II Refractories for the Cement
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Effects of silica sol on the preparation and high
· Silicon oxynitride bonded SiC castables (SS castables) were prepared via in-situ nitridation at 1420 °C for 6 h in flowing N 2 using black SiC SiO 2 fume and Si powder as starting materials and silica sol as a binder. Phase compositions and microstructures of as-prepared SS castables were characterized and the effects of silica sol s type and amount on their cold and hot moduli of rupture
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Silica Sol Bonded High Alumina Castable Effect of Reduced Sol
· Silica Sol Bonded High Alumina Castable Effect of Reduced Sol. Sarada Prasanna Das 1 Birendra Prasad 1 Ritwik Sarkar 2 Arun Kumar 2. 1 OCL Refractory Ltd. Rajgangpur Odisha770017/India 2 National Institute of Technology Rourkela Odisha769008/India. Revision . Volume 7 Issue 2 Pages 8387. Abstract. Effect of reduction in sol content in no cement high alumina castable
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New developments in non-cement refractories -
· bonded castables Usual Cement Castables NANOBOND Type regular medium low cement or ultra-low cement castable no cement castable Mixing Agent water special liquid binder Variation of setting time usual additives amount on liquid binder Available raw materials no technical restrictions chamotte bauxite tabular alumina andalusite fused
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Applications of Strontium Aluminate Cements IntechOpen
· These sols with low solid content (about 5 wt. ) in water suspension were prepared by the addition of silica fume and MgCl 2 6H 2 O into vigorously stirred boehmite sol (Fig.3(b) and (c)) and used as an additive for CAC containing castables in order to evaluate their effect on physical and mechanical properties as well as on slag corrosion
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Microstructure and reactivity evolution of colloidal
· Therefore to investigate the possibility of mullite phase forms at relatively low temperatures in the presence of silica sol a mixture of the dried silica gel powder and tabular alumina fines (m (Al 2 O 3) m (SiO 2) = 3 2) has been fired at °C for 3 h both in air and in reducing atmosphere.
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An Empirical Research on Consequences of Nano Silica on
· An Empirical Research on Consequences of Nano Silica on Performance of OPC and Blended Cementwritten by Shaik Abdul Azeez Baba P. Pradeep Kumar Dr. P. Sri Chandana published on 2019/09/23 download full article with reference data and citations
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Easy-to-use mullite and spinel sols as bonding agents in a
· The sol-bonded ULCC samples were named as M and S respectively to distinguish the two sols. The samples were cast by simple tapping technique with cube (25.4 mm) and bar (75 12.5 12.5 mm)-type moulds to improve particle-packing .All of these specimens were then cured under humid conditions for 24 h followed by 24 h of air drying and oven drying at 110 °C.
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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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Effects of silica sol on the preparation and high
· Compared with CA cement silica sol shows several advantages as a castable binder including 1) relatively higher hot strength can be retained as a result of less low-melting phase formation on heating 2) highly reactive SiO 2 nanoparticles from silica sol readily react with other phases on heating forming strong in-situ bonding and 3) green samples after drying have higher volume stability and mechanical strength than those bonded with CA cement .
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technology trendsrefractories-worldforum
· Silica-sol bonded no-cement refractory castables are attractive to the industry due to their high temperature performance and fast dry-out in comparison to low cement castables. However these castables are not widely used due to inadequate green strength and long set-time/complex set-behaviour. In this paper dry silica-gel bonded no-cement
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Silica Sol Bonded High Alumina Castable Effect of
Silica sol bonded high alumina castables with different particles size distributions were prepared using white tabular alumina (WTA) grains and fines (Almatis/IN) react-Tab. 1 Physico-chemical properties of different starting materials Constituent WTA Grain WTA Fines Reactive Alumina Fine Silica Sol SiO 2 0 08 0 11 0 03 29 8 Al
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Development of Nano-ZrO2 Reinforced Self-Flowing Low
· reinforced self flow low cement (5 ) and ultra low cement (3 and 1 ) castables based on tabular alumina. In processing these castables the Andreassen model was used to obtain optimum self flow properties in both low and ultra low castables. The castables thus produced were fired at 110 and 1000 1300 and 1500oC and the phases obtained
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Incorporating Nano-silica as a Binder to Improve Corrosion
· 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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Water sensitivity of cement‐based materialsZhou
1 INTRODUCTION. Almost all of the physical and chemical aspects of cement-based materials (CBMs) are mediated by water. 1 Hydraulic cements chemically react with water to bind aggregates and make fresh mixture set and harden. During prolonged hydration of cements chemical shrinkage plastic shrinkage and autogenous shrinkage of CBMs are all intimately related to the consumption or loss of
Get PriceWater sensitivity of cement‐based materialsZhou
1 INTRODUCTION. Almost all of the physical and chemical aspects of cement-based materials (CBMs) are mediated by water. 1 Hydraulic cements chemically react with water to bind aggregates and make fresh mixture set and harden. During prolonged hydration of cements chemical shrinkage plastic shrinkage and autogenous shrinkage of CBMs are all intimately related to the consumption or loss of
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Cement Limerefractories-worldforum
· Fig. 9 Advantageous acid resistance to H2SO4 of no-cement concretes compared to a low cement concrete. A comparison of cement-free NCCs (sol-gel- and geopolymer-bonded) and an LCC shows the advantage of a CaO-free system after exposure to sulphuric acid at 20 °C to different acidic concentrations and ex-posure times (Fig. 9).
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