Progress in Ceramics Series Refractory Ceramics
· Tailoring the Microstructure of Cement‐Bonded Alumina–Magnesia Refractory Castables Brochen_et_al-2014-International_Journal_of_Applied_Ceramic_Technology.pdf Improved Thermal Stress Resistance Parameters Considering Temperature Gradients for Bricks in Refractory Linings
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Effects of TiO2 addition on the expansion behavior of
Cement-bonded alumina–magnesia refractory castables present excellent properties because of the in situ spinel and calcium hexaluminate formation. However controlling the expansion derived from in situ reactions is essential for keeping the integrity of castables. The present work addresses the effects of TiO 2 addition on the expansion behavior
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Improvement in Slag Resistance of No-Cement Refractory
· The pre-formed spinel containing cement bonded castable (labelled LCC-SP) was chosen as a reference mix in which no microsilica was added. The cement content was 7.0 wt . Tabular alumina (T60 Almatis Ludwigshafen am Rhein Germany) and alumina rich spinel (AR 78 Almatis Ludwigshafen am Rhein Germany) were used as aggregates.
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Tailoring the Microstructure of Particle-Stabilized Wet
· Inorganic colloidal particles which are in situ hydrophobized upon adsorption of short-chain amphiphilic molecules can be used as foam stabilizers. In this study we tailor the microstructure of particle-stabilized wet foams namely the foam air content average bubble size and bubble size distribution by changing the composition of the initial colloidal suspension. Wet foams featuring
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TAILORING THE MICROSTRUCTURE AND THERMO-MECHANICAL
Additionally aiming to tailor the castables microstructure (i.e. favoring anisotropic growth of alumina grains increasing the bond strength and reinforcing the interface between Al2O3
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Spark plasma sintering of ceramic matrix composite based
Microstructure observations of the composite shows that some CNTs site along alumina grains boundary while others embed into the alumina grains and shows that CNTs bonded strongly with the alumina matrix contributing to fracture toughness and microhardness increase. MWCNTs reinforcing mechanisms including CNT pull-out and crack deflection were
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Tailoring the Microstructure of Particle-Stabilized Wet
· Inorganic colloidal particles which are in situ hydrophobized upon adsorption of short-chain amphiphilic molecules can be used as foam stabilizers. In this study we tailor the microstructure of particle-stabilized wet foams namely the foam air content average bubble size and bubble size distribution by changing the composition of the initial colloidal suspension.
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Alumina-Rich Castables Microstructural and
· C2 partners the reactive alumina was supplied by Alteo the tabular alumina and calcium aluminate cement by Imerys and the calcium hexa-aluminate raw material by Almatis. The dispersant used for the deflocculation was supplied by BASF. Table 1. Formulations of the matrix samples (a) gel bonded matrix A (b) cement-bonded matrix CA6. a
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Reasons for crack propagation and strength loss in
· alumina reactive alumina hydratable alumina calcium aluminate cement silica fume and colloidal suspen-sions etc.). Therefore when cement is used in a refractory castable s matrix the amount of cement as well as the content of Al 2O 3 in the cement will
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Solidification method for phosphate bonded alumina cement
The authors have tried to apply some cementitious materials to this process. A commercially available alumina cement is used and the effects of addition of sodium phosphate and silica fume are examined to increase the strength of solidified alumina cement. The reaction temperature is
Get PriceINFLUENCE OF NANO SILICA ON PROPERTIES AND
(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 tabular alumina ultra fine alumina (<45 m) reactive alumina microsilica and high alumina cement of secar 71 from Lafarge Co. Silica sol as
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Application of Alumina-Based Ceramic Paste for High
· Alumina-based die-attach and encapsulation for high-temperature (300–500 °C) electronic packaging were investigated. The alumina paste material comprises aluminum dihydric phosphate as a binder and alumina powder as a filler with embedded nano-aluminum nitride and nanosilica powders to promote its curing process reduce its curing tension and increase its bond shear strength.
Get PriceInfluence of alumina air-abrasion for highly translucent
Different air-abrasion conditions affected the bond strength of resin cement in the case of the highly translucent Y-TZP air-abraded with between 50-µm alumina at 0.2 MPa and 30-µm alumina at 0.12 MPa. 44 Water storage for 3 months resulted in the reduction of microtensile bond strength for the group air-abraded with smaller alumina particles
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Fracture behavior and microstructure analysis of Al 2 O 3
Abstract. Three different castables based on the Al 2 O 3-MgO-CaO system were prepared as steel-ladle purging plug refractories corundum- based low-cement castable (C-LCC) corundum-spinel-based low-cement castable (C-S-LCC) and corundum-spinel no-cement castable (C-S-NCC) (hydratable alumina (ρ-Al 2 O 3) bonded).The fracture behavior at room temperature was tested by the method of "wedge
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Tailoring the Microstructure of Cement‐Bonded Alumina
· Taking into account the usual microstructure of cement-bonded alumina–magnesia refractory castables comprising low-temperature melting point phases in the CaO–MgO–Al 2 O 3-–SiO 2 system and calcium hexaluminate (CA 6) platelets this material could be a good candidate to be designed based on the structure of biological materials but fit to the high-temperature working conditions.
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(PDF) Microstructure and phase evolution of alumina–spinel
The influence of nano-alumina content on the firing at 1300 8C are presented in Fig. 6. microstructure It can be seen that addition of nano-alumina particles can increase bonding system between fine particles which produces Fig. 5 demonstrates the microstructure of alumina–spinel lower porosity and smaller pore sizes resulting in higher
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Use of the sol-gel method for the production of no cement
· The most of commonly used castables are bonded by calcium aluminate cement (CAC). There are also other alternative binders such as phosphates hydratable alumina
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paperexpansion behavior of cement bonded alumina magnesia
Tailoring the Microstructure of Cement‐Bonded Alumina . Considering this aspect aqueous suspensions and alumina-magnesia cement-bonded compositions with and without MgF2 were evaluated in order to better understand its effect on the castable s phase . Chat Online Characterization of the Evolution of Cementing Materials . Curing and Aging
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INFLUENCE OF NANO SILICA ON PROPERTIES AND
(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 tabular alumina ultra fine alumina (<45 m) reactive alumina microsilica and high alumina cement of secar 71 from Lafarge Co. Silica sol as
Get PriceA REVIEW OF REFRACTORY BOND SYSTEMS FOR
· The consistency of high alumina cements with regard to setting and strength development is a key quality feature which distinguishes different brands available in the market. The quality testing of cement must take into account inherent variation of the cement setting behavior which occurs for example in neat cement testing.
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Properties of alumina based low-cement self flowing
In addition to these studies different alumina types which affect the aggregate system and the roles of additives (calcined alumina microsilica) are also examined by using n = 0.23 value. Finally SEM studies are performed to investigate the microstructure of these self flowing castables.
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The corrosion and microstructure relationship for cement
· Microstructure of the corroded samples highlighting the different interactions between molten slag and tabular alumina (TA) aggregates according to the sort of spinel incorporated. The dashed lines indicate the former borders of the aggregates before the slag attack.
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Monocrystalline Alumina Grains MA88 Supplier
· MA88 Monocrystalline Alumina Grains The Future for Cool-Cutting Alumina Abrasives. Manufactured at Saint-Gobain Abrasive Materials China production facility utilizing Japanese technology our MA88 ® monocrystalline alumina is an electro-fused abrasive produced by fusing high purity alumina with special alloys. Each particle is a single crystal resulting in more sharp strong edges that
Get PriceComparison of Cement- and Hydratable Alumina-Bonded
· Results with higher cement contents and lower or higher hydratable alumina contents were reported in a previous paper 6 . Raw materials were dry mixed in a Hobart mixer for 1 min and then wet mixed after adding the water. The wet out time for the two types of mixes was different. For the cement bonded mix the wet out time was around 40 s and wet mixing time a total of 4 min. For the
Get PriceInfluence of alumina air-abrasion for highly translucent
Different air-abrasion conditions affected the bond strength of resin cement in the case of the highly translucent Y-TZP air-abraded with between 50-µm alumina at 0.2 MPa and 30-µm alumina at 0.12 MPa. 44 Water storage for 3 months resulted in the reduction of microtensile bond strength for the group air-abraded with smaller alumina particles
Get PriceProperties of alumina based low-cement self flowing
In addition to these studies different alumina types which affect the aggregate system and the roles of additives (calcined alumina microsilica) are also examined by using n = 0.23 value. Finally SEM studies are performed to investigate the microstructure of these self flowing castables.
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Alumina-Rich Castables Microstructural and
· C2 partners the reactive alumina was supplied by Alteo the tabular alumina and calcium aluminate cement by Imerys and the calcium hexa-aluminate raw material by Almatis. The dispersant used for the deflocculation was supplied by BASF. Table 1. Formulations of the matrix samples (a) gel bonded matrix A (b) cement-bonded matrix CA6. a
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Effects of SnO2 Addition on the Properties of Alumina
· Alumina-magnesia refractory castables are usually bonded with calcium aluminate cement (CAC) because of its notable advantages including suitable workability and mechanical strength 1 . At high temperatures the free magnesia in the castables matrix could react with alumina to form spinel meanwhile calcium dialuminate (CA 2)
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Properties of alumina based low-cement self flowing
In addition to these studies different alumina types which affect the aggregate system and the roles of additives (calcined alumina microsilica) are also examined by using n = 0.23 value. Finally SEM studies are performed to investigate the microstructure of these self flowing castables.
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