Papers
Colloidal Alumina as a Novel Castable Bonding System. Volume 3 Issue 3 Pages 7. Abstract References Full Article Comparison of Cement- and Hydratable Alumina-Bonded Alumina-Spinel Materials for Steel Ladle Purging Plugs. Andreas Buhr Harald Harmuth Bin Long Jerry Dutton In-Ho Jung Shengli Jin. Volume 9 Issue 3 Pages 93106
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Resistência à erosão de concretos refratários de alta
In this work the cold erosion resistance of high-alumina refractory castables containing colloidal silica and a blend of colloidal silica and hydratable alumina as bonding agents were comparated to commercial calcium aluminate cement containing alumina refractory castable specified by the producer as a suitable material for erosion wear
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An Introduction to the Types of Monolithic Refractories
May 10 2002 · They are gelled with the help of a binder system in the material s green state. After the material is heated the binder either changes or volatilizes allowing the formation of a ceramic bond. High alumina cement (HAC) is the most typical binder used in castables. Other binders that are commonly used include colloidal silica and hydratable
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Oxide Scale Formation In Novel - Cobalt-Based Alloys
an alloy to generate continuous alumina scale in short times of order 1 h to minimize the growth of overlying oxides or excessive Al depletion below the scale. The work reported here is part of a broader investigation on the effects of alloying on the oxidation resistance and γ solvus temperature for the novel family of γ-γ Co alloys. First
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Ludox® -- Technical Literature
intermediate between colloidal alumina and colloidal silica. The alumina coating retards the conversion of The unique behaviour of Ludox® AM results from the novel means used to create the negative charge on the particles of this sol. A comparison of the particle charges on the interparticle bonding decreases and the sol becomes more
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PAPER OPEN ACCESS (IIHFWRI O)
modifying additive. The presence of ultrafine silica particles in alumina castable system form mullite bonds at high temperatures and improve the properties of the castables. But the hances of presence of free silica and formation of liquid phase bove the eutectic temperature in Al2O3-SiO2 system have
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USB2Refractory castables with hydrophobic
Hydrophobic aggregates for use in refractory castables and gunning mixtures and methods of their preparation. The aggregates here are formed by crushing insulating fire brick and coating the resulting particles with a hydrophobic component. The hydrophobic component may be a polydimethylsiloxane having a terminal silanol group. As a result of the coating process the coated aggregate has very
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Room-temperature gelcasting of alumina with a water
A novel and simple method was developed for gelcasting alumina at room temperature in air wherein only an additive i.e. a copolymer of isobutylene and maleic anhydride (Isobam 104#) which acts as both dispersant and gelling agent is used. With a small amount of Isobam (0.3 wt ) a slurry with as high as 50 vol solids loading was prepared.
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Refractory Systems for Steel Casting and Treatment Ladles
A new type of alumina-based no-cement refractory material • Alumina based no-cement carbon containing castable with colloidal silica (SOL) binder system • Significantly increased refractoriness under load compared to cement bonded products • Reduced
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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 alumina additives like microsilica etc. are also present
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Binders for Refractory Castables An Overview SpringerLink
Sep 11 2020 · Abstract A binder for refractory castables is a bonding material that bonds a loose powdery mix retains its shape after casting and allows the cast shape to set and harden for handling and further processing. A binder also improves sintering as the castables are not compacted during shaping causing poor densification and strength. Initially plastic clay was used as a binder for castables
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FIRE Compendium Series Vol. 1 Refractory Castable
2.4. Eff ect of castable s matrix and additives on binder hydration 191 2.5. Evolution of CAC and HA-bonded castables properties during the curing stage 205 3. Chemical binders (phosphates) 211 3.1. Bonding mechanisms 213 4. Colloidal binders 217 4.1. Colloidal silica (CS) 219 4.2. Colloidal alumina (CA) 235 5. Final remarks 241 6
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Microsilica-Gel Bonded Refractory Castables with Improved
UNITECR 95 Kyoto Japan 1995 II/317–324 Ismael M.R. et al. Colloidal silica as a nanostructured binder for refractory castables.
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Binders for Refractory Castables An Overview SpringerLink
Sep 11 2020 · Abstract A binder for refractory castables is a bonding material that bonds a loose powdery mix retains its shape after casting and allows the cast shape to set and harden for handling and further processing. A binder also improves sintering as the castables are not compacted during shaping causing poor densification and strength. Initially plastic clay was used as a binder for castables
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CASTABLE REFRACTORY COMPOSITIONCALDERYS FRANCE
A castable refractory composition may include from 5 to 95 by weight of alumina aluminosilicate or mixtures thereof up to 70 by weight silicon carbide up to 10 by weight carbon from 0.1 to 5 by weight alkaline earth metal oxide and/or hydroxide and from 0.1 to 5 bv weight of silica having a surface area of at least about 10 m 2 /g. The refractory composition may further include
Get PriceAn Introduction to Refractory BindersAZoM
May 10 2002 · An Introduction to Refractory Binders. Gelling materials together in the green state is the main purpose of a refractory binder. At higher temperatures binders subsequently volatilize dehydrate or sinter leaving behind a refractory material. There are several binders that are typically used for refractory applications the most widely used
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Oxide Scale Formation In Novel - Cobalt-Based Alloys
an alloy to generate continuous alumina scale in short times of order 1 h to minimize the growth of overlying oxides or excessive Al depletion below the scale. The work reported here is part of a broader investigation on the effects of alloying on the oxidation resistance and γ solvus temperature for the novel family of γ-γ Co alloys. First
Get Price(PDF) Enhancing the green mechanical strength of colloidal
CMOR of alumina castables bonded by colloidal silica (CS) colloidal silica with KH-570 as the setting agent (CS þ KH-570) and 2 wt CAC (CAC-ref). The
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(PDF) Refractory Castables Based on Colloidal Silica and
Colloidal silica (CS) and hydratable alumina (HA) as a combined binding system can bring better advantages to the processing and properties of refractory castables. Three castable
Get PriceUSATwo-part gunning refractory composition
The present invention relates to a two-part gunning refractory composition wherein fine powders of a refractory aggregate and superfine refractory powders are previously made into the form of a slurry containing therein a deflocculant thereby reducing the amount of aluminous cement and also reducing the amount of water to achieve a deposit applied by gunning having a quality comparable to one
Get PriceA REVIEW OF REFRACTORY BOND SYSTEMS FOR
experimental data along with a perspective of the evolution and development of bond systems over the last 20 years. A specific focus will be given to bond systems for monolithic castables. Results will show the different comparative characteristics for each system and their advantages as well as the tradeoffs that have to be made.
Get PriceNanotechnology 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 alumina additives like microsilica etc. are also present
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4 800 122 000 135M
with hydraulic bonding in which higher amounts of calcium aluminate cement (CAC) were used towards coagulating binders such as colloidal silica or alumina 450 451 . In general the refractory castables can be considered as composites where the bonding phase (matrix) is reinforced by particles of aggregate (reinforcement) 465 480 .
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COLLOIDAL ALUMINA AS A NOVEL CASTABLE BONDING
1 COLLOIDAL ALUMINA AS A NOVEL CASTABLE BONDING SYSTEM M.A.L. Braulio C. Tontrup J. Medeiros V.C. Pandolfelli M.A.L. Braulio V.C. Pandolfelli
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technology trends
Sep 12 2010 · Key words no-cement castable silica-sol microsilica gel-bond additive 1. INTRODUCTION No-cement refractory castables have been of great interest in the last two decades. Different no-cement systems such as microsilica colloidal silica hydratable alumina and colloidal alumina have been developed1-4. Silica-sol bonded refractory
Get Price(PDF) Colloidal alumina as a novel castable bonding system
PDF On Jan 1 2011 M.A.L. Braulio and others published Colloidal alumina as a novel castable bonding system Find read and cite all the research you need on ResearchGate
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Thermal shock resistance properties of refractory
Feb 01 2021 · Many efforts have been made to develop CaO-free binders (i.e. MgO fumes hydratable alumina magnesium silica hydrates colloidal alumina Colloidal alumina as a novel castable bonding system. Refract. Worldforum 3 (2011) pp. . View Record in Scopus Google Scholar.
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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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kontraktorrefractorybat KONTRAKTOR REFRACTORY0811.342
Castable Refractories are materials which consist of precision graded coarse and fine refractory grains. They are gelled by means of a binder system in the materials green state. Following the heat-up of the material the binder either transforms or volatilises facilitating the formation of a ceramic bond.
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