Evolution of an alumina-magnesia/self-forming spinel
The development of a self-forming spinel castable without any synthetic spinel grains appears to be promissory for optimum refractory linings.Refratários contendo espinélio de aluminato de magnésio (MgAl2O4) são materiais para tecnologia emergentes em várias aplicações tais como cimento e processos siderúrgicos.
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Physical and mechanical properties of hot-press sintering
· Fuhrer M Hey A Lee WE. Microstructural evolution in self-forming spinel/calcium aluminate-bonded castable refractories. J Eur Ceram Soc 1998 18 813–820. Article Google Scholar 13 Chan C-F Ko Y-C. Effect of CaO content on the hot strength of alumina-spinel castables in the temperature range of 1000° to 1500 .
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Evolution of an alumina-magnesia/self-forming spinel
This study was carried out in conjunction with the investigation reported in Part I on the microstructural characteristics of an alumina-spinel castable with several percentages of MgO content. Bulk density and cold crushing strength of samples were evaluated dried and at three fired states (1000 1200 1400 °C).
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Novel calcium hexaluminate/spinel-alumina composites with
· Calcium hexaluminate (CA6) was incorporated into the matrix of magnesio aluminate spinel-alumina (MA-A) via infiltration of a porous preform fabricated from α-Al2O3 and MgO powders with a
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Synthesis of Magnesium Aluminate Spinel Powder from the
Synthesis of magnesium aluminate spinel (MgAl2O4) was investigated by employing ball milling and co-precipitation methods. The starting materials (aluminum hydroxides) were obtained from the purified sodium hydroxide leaching solution of black dross. The characteristics of the synthesized spinel was analyzed through X-ray diffraction (XRD) scanning electron microscopy (SEM) images.
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Formation mechanism of calcium hexaluminate SpringerLink
· M. Fuhrer A. Hey and W.E. Lee Microstructural evolution in self-forming spinal/calcium aluminate-bonded castable refractories J. Eur. Ceram. Soc.
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Phase Evolution During Preparation of Spinel-Containing
· Spinel containing high alumina refractory cements are in high demand by the glass cement and metallurgy industries. These spinel cements are normally produced with high cost materials. A solution is to generate the spinel phase in-situ when making the refractory materials from dolomites.
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(PDF) Microstructural evolution in MgOp/AlN composites
were infiltrated into an Al2O3 preform over N2 or N2–H2 in the plays an important role in the microstructural evolution of these temperature range 900–1200 8C 15 . MgOp/Al composites. Fort the nitridation process of Al with The corrosion of MgO by Al was obvious during the external dopant Mg the major Mg source was the Mg powder experiment.
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(PDF) Microstructural evolution in MgOp/AlN composites
were infiltrated into an Al2O3 preform over N2 or N2–H2 in the plays an important role in the microstructural evolution of these temperature range 900–1200 8C 15 . MgOp/Al composites. Fort the nitridation process of Al with The corrosion of MgO by Al was obvious during the external dopant Mg the major Mg source was the Mg powder experiment.
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Microstructural evolution in self-forming spinel/calcium
· Microstructural evolution in self-forming spinel/calcium aluminate-bonded castable refractories 817 3.2 Phase morphology XRD indicates little spinel formation in SF 1200 the main phases being corundum and periclase.
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From Macro to Nanomagnesia Designing the in situ Spinel
Magnesia grain size affects the in situ spinel formation kinetics and expansion of alumina–magnesia refractory castables. The use of coarse grains results in a large expansion and delays the reaction s starting temperature. In this work the addition of an MgO source with different grain sizes (from macro Dmax≤0.1 mm to nano D50≤20 nm) led to a broad linear expansion range (6 –2
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Microstructural evolution in self-forming spinel/calcium
Calcium aluminate bonded alumina-spinel castable refractories have been fabricated with in-situ spinel formation. Spinel formation occurs between 1200 and 1400 °C with a net-like morphology interlinked with CaO-MgO-Al 2 O 3-SiO 2 phases. Spinel generated at 1400 °C is nearly stoichiometric but at higher temperatures it progessively enriches in Al 2 O 3.
Get PriceA new high-voltage calcium intercalation host for ultra
· A closer look at the trend in Fig. 4a indicates a concentration-dependent calcium ion diffusion coefficient which presents higher values at the low calcium concentrations in Ca x Na 0.5 VPO 4.8 F
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Improved high temperature thermal shock resistance of high
Improved high temperature thermal shock resistance of high alumina refractory monolithics thanks to in-situ spinel formation in a smart matrix. A. Lee W. E. Microstructural evolution in self-forming spinel/calcium aluminate castable refractories J. Eur. Ceram. Dannert C. Holleyn F. Krause O. How does the spinel formation
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csidocsa-lyon.fr
· forming spinel/calcium aluminate-bonded castable refractories » Journal of the European Ceramic Society 1998 Vol 18 p . GABI96 GABIS V. « Principales tendances dans la conception des réfractaires à hautes
Get PriceMicrostructural Development in Calcium Hexaluminate with
· Microstructural Development in Calcium Hexaluminate with and without Fe2O3 Doping at Different Forming Method. Swapan Kumar Das 1 Manidip Jana 2. 1 Refractory Division CSIR-Central Glass Ceramic Research Institute Kolkata 700 032 India 2 Refractory Division CSIR-Central Glass Ceramic Research Institute Kolkata 700 032/India. Revision . Volume 6 Issue 4 Pages 6165
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Chemobrionic structures in tissue engineering self
Evolution of chemobiotic morphologies Chemobrionic calcium phosphate structures generated from dibasic sodium phosphate solutions (0.2–1 M) appear as white tube structures that form twisting patterns in the horizontal plane and grow upward through the phosphate solution . Tubes were slow to form when calcium hydrogels were layered with
Get PriceEvolution of an alumina-magnesia/self-forming spinel
This study was carried out in conjunction with the investigation reported in Part I on the microstructural characteristics of an alumina-spinel castable with several percentages of MgO content. Bulk density and cold crushing strength of samples were evaluated dried and at three fired states (1000 1200 1400 °C).
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Synthesis and Characterization of Calcium Aluminate
· Synthesis and Characterization of Calcium Aluminate Spinel Using Solution Combustion Method takes place forming viscous solution at 200°C the viscous liquids swelled and gets auto ignited with the rapid evolution of a large volume of gases to produce voluminous powders. The nature of ignition depended on the fuel-to-
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Evolution of an alumina-magnesia/self-forming spinel
The development of a self-forming spinel castable without any synthetic spinel grains appears to be promissory for optimum refractory linings.Refratários contendo espinélio de aluminato de magnésio (MgAl2O4) são materiais para tecnologia emergentes em várias aplicações tais como cimento e processos siderúrgicos.
Get Price
Synthesis of Magnesium Aluminate Spinel Powder from the
Synthesis of magnesium aluminate spinel (MgAl2O4) was investigated by employing ball milling and co-precipitation methods. The starting materials (aluminum hydroxides) were obtained from the purified sodium hydroxide leaching solution of black dross. The characteristics of the synthesized spinel was analyzed through X-ray diffraction (XRD) scanning electron microscopy (SEM) images.
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Transformation of amorphous calcium phosphate to bone
· The microstructural evolution of CaP minerals within the PLLC is similar to bone with respect to the initial and final structure and morphology the first formed particles are spherical ACPs in
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Porogenesis in the Alumina-Brucite-Magnesia-Spinel System
· Abstract Magnesium monoaluminate spinel (MgAl2O4) is an important raw material for the refractory industry and its in-situ formation from Al2O3 and MgO sources is an expansive process due to its low density. Such an expansion can be a serious drawback for the production of dense structural bricks and castables since it frequently causes deformations and cracks and hinders particles from
Get PricePhase Evolution During Preparation of Spinel-Containing
· Spinel containing high alumina refractory cements are in high demand by the glass cement and metallurgy industries. These spinel cements are normally produced with high cost materials. A solution is to generate the spinel phase in-situ when making the refractory materials from dolomites.
Get Price
Novel calcium hexaluminate/spinel-alumina composites with
· Calcium hexaluminate (CA6) was incorporated into the matrix of magnesio aluminate spinel-alumina (MA-A) via infiltration of a porous preform fabricated from α-Al2O3 and MgO powders with a
Get Price
Alumina-rich refractory concretes with added spinel
· Microstructure and phase evolution with temperature The changes in microstructure and phase evolution during the first stages of sintering were mainly due to the calcium aluminate transformations whereas at higher temperatures the change in evolution was clearly due to alumina/magnesia and alumina/dolomite reactions.
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Microstructure and phase evolution of alumina–spinel self
2 J.M. Auvray C. Gault M. Huger Microstructural changes and evolutions 19 M. Fuhrer A. Hey W.E. Lee Microstructural evolution in self-forming of elastic properties versus temperature of alumina and alumina–magnesia spinel/calcium aluminate-bonded castable refractories Journal of the refractory castables Journal of the European Ceramic Society 28 (10) European Ceramic Society 18 (7) (1998)
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Evolution of an alumina-magnesia/self-forming spinel
On the basis of the microstructural investigation of an alumina-magnesia/self-forming spinel castable it can be concluded that (1) Spinel formation in the matrix of the castable could be achieved at temperatures around ° C and the amount of spinel
Get Price(PDF) Microstructural evolution in MgOp/AlN composites
were infiltrated into an Al2O3 preform over N2 or N2–H2 in the plays an important role in the microstructural evolution of these temperature range 900–1200 8C 15 . MgOp/Al composites. Fort the nitridation process of Al with The corrosion of MgO by Al was obvious during the external dopant Mg the major Mg source was the Mg powder experiment.
Get Price
Porogenesis in the Alumina-Brucite-Magnesia-Spinel System
· Abstract Magnesium monoaluminate spinel (MgAl2O4) is an important raw material for the refractory industry and its in-situ formation from Al2O3 and MgO sources is an expansive process due to its low density. Such an expansion can be a serious drawback for the production of dense structural bricks and castables since it frequently causes deformations and cracks and hinders particles from
Get Price
