Preparation and Properties of MgAl2O4-CaAl12O19 High
The utilization of lightweight refractories plays an important role in reducing the energy consumption of industrial furnaces. In this paper MgAl2O4-CaA112O19 high temperature composite was synthesized via solid state reaction using magnesite dolomite and industrial alumina as raw materials. The influences of raw materials and reaction temperature on phase compositions and microstructure of
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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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SciELO Analytics (Beta)
SciELOScientific Electronic Library Online FAPESP CNPq BIREME FapUnifesp. Avenida Onze de Junho 269Vila Clementino São Paulo. Tel. 55 11 /59Email scielo scielo
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Evolution of an alumina-magnesia/self-forming spinel
adding synthetic spinel grains and fine MgO powder to form in-situ spinel bond in the binder phase of the castable adding fine MgO powder to promote a self-forming spinel product. Thus the development of alumina-spinel castables can be achieved with or without the addition of synthetic spinel grains.
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Phase Composition of Bauxite-based Refractory Castables
The self-forming (in situ) spinel is fabricated during service by reaction of ne magnesia (MgO) additions with alumina present in the matrix (bond) nes often in the calcium aluminate cement. Very often small
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CeramicaISSN
Academic Journals Database is a universal index of periodical literature covering basic research from all fields of knowledge and is particularly strong in medical research humanities and social sciences. Full-text from most of the articles is available. Academic Journals Database contains complete bibliographic citations precise indexing and informative abstracts for papers from a wide
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All articlesJournal of Ceramic Science
The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of the relationships between processing microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials.
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(Calcium aluminate cement and its effects on in-situ
Calcium aluminate cement (CAC) bonded alumina-magnesia refractory castables present great advantages for steel ladle applications as a result of in-situ expansive formation of spinel and CA 6 which leads to high basic slag and thermal shock resistance.The CAC content in those castables strongly influences its expansive behavior mainly due to CA 6 formation.
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Preparation and Properties of MgAl2O4-CaAl12O19 High
The utilization of lightweight refractories plays an important role in reducing the energy consumption of industrial furnaces. In this paper MgAl2O4-CaA112O19 high temperature composite was synthesized via solid state reaction using magnesite dolomite and industrial alumina as raw materials. The influences of raw materials and reaction temperature on phase compositions and microstructure of
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Study of Al2O3 MgO Refractory Castables Corrosion by
Nevertheless for higher cement alumina content castables the formation of cracks is observed in refractory castables into which slag deposit can penetrate. The slag reacts with alumina to form a new phase such as hibonite (CA6) and calcium dialuminate (CA2). The expansive reactions involving CA2 and CA6 lead to the apparition of macro-cracks.
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CeramicaISSN
Academic Journals Database is a universal index of periodical literature covering basic research from all fields of knowledge and is particularly strong in medical research humanities and social sciences. Full-text from most of the articles is available. Academic Journals Database contains complete bibliographic citations precise indexing and informative abstracts for papers from a wide
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Porogenesis in the Alumina-Brucite-Magnesia-Spinel System
Abstract Magnesium monoaluminate spinel (MgAl 2 O 4) is an important raw material for the refractory industry and its in-situ formation from Al 2 O 3 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
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Evolution of in Situ Refractories in the 20th Century
Feng Wang Pingan Chen Xiangcheng Li and Boquan Zhu Effect of micro-spinel powders addition on the microstructure and properties of alumina refractory castables Ceramics International 10.1016/j.ceramint.2018.10.049 (2018).
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CORE
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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Spinel-containing alumina-based refractory castables
Aug 01 2011 · Instead of pre-reacted spinel these castables contain free magnesia in the matrix fines which form spinel by reacting with alumina during use at high temperatures (in situ spinel formation) . Spinel forming castables have shown advantages when compared to spinel containing ones in steel ladle side wall lining and have become a
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SciELO Analytics (Beta)
SciELOScientific Electronic Library Online FAPESP CNPq BIREME FapUnifesp. Avenida Onze de Junho 269Vila Clementino São Paulo. Tel. 55 11 /59Email scielo scielo
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Journal of The Electrochemical Society Volume 162 Number
The corrosion behavior of magnesium-aluminum (Mg-Al) alloy AM50 produced by a rheocasting (RC) technique was examined in the presence and absence of CO 2 at three temperatures −4 4 and 22°C. The slurry preparation in the RC material was performed with the newly developed RheoMetal process.
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Coprecipitation Synthesis of NixMn1−x(OH)2 Mixed
Four separate coprecipitation routes were applied to the preparation of NixMn1−x(OH)2 mixed hydroxides with x = 1 5/6 2/3 1/2 1/3 and 0 beginning with divalent nitrates. The structure and morphology of the samples were studied by X-ray diffraction and scanning electron microscopy techniques. Intentionally bubbled air during coprecipitation was found to create layered double hydroxide
Get PricePhase Composition of Bauxite-based Refractory Castables
The self-forming (in situ) spinel is fabricated during service by reaction of ne magnesia (MgO) additions with alumina present in the matrix (bond) nes often in the calcium aluminate cement. Very often small
Get Price
Evolution of in Situ Refractories in the 20th Century
Feng Wang Pingan Chen Xiangcheng Li and Boquan Zhu Effect of micro-spinel powders addition on the microstructure and properties of alumina refractory castables Ceramics International 10.1016/j.ceramint.2018.10.049 (2018).
Get Price
Porogenesis in the Alumina-Brucite-Magnesia-Spinel System
Abstract Magnesium monoaluminate spinel (MgAl 2 O 4) is an important raw material for the refractory industry and its in-situ formation from Al 2 O 3 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
Get Price
Journal of The Electrochemical Society Volume 162 Number
The corrosion behavior of magnesium-aluminum (Mg-Al) alloy AM50 produced by a rheocasting (RC) technique was examined in the presence and absence of CO 2 at three temperatures −4 4 and 22°C. The slurry preparation in the RC material was performed with the newly developed RheoMetal process.
Get Price
All articlesJournal of Ceramic Science
The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of the relationships between processing microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials.
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Nanostructured Thin Film Electrocatalysts for PEM Fuel
Research of Features of Periodically Doped Channel SiMOSFET Technology Based on Self-Forming Nanostructures for Perfecting Orlov O.M. / Smirnov V.K. / Krasnikov G.Y. /
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Copper Metal for Semiconductor Interconnects IntechOpen
Jun 28 2017 · Resistance-capacitance (RC) delay produced by the interconnects limits the speed of the integrated circuits from 0.25 mm technology node. Copper (Cu) had been used to replace aluminum (Al) as an interconnecting conductor in order to reduce the resistance. In this chapter the deposition method of Cu films and the interconnect fabrication with Cu metallization are introduced.
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Coprecipitation Synthesis of NixMn1−x(OH)2 Mixed
Four separate coprecipitation routes were applied to the preparation of NixMn1−x(OH)2 mixed hydroxides with x = 1 5/6 2/3 1/2 1/3 and 0 beginning with divalent nitrates. The structure and morphology of the samples were studied by X-ray diffraction and scanning electron microscopy techniques. Intentionally bubbled air during coprecipitation was found to create layered double hydroxide
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Issue No. 1Techna Group
Also 5-20 of calcined alumina and raw zircon were mixed with the magnesium as well as aluminium hydroxides to prepare varieties of periclase-spinel periclaseforsterite-zirconia as well as corundum-mullitezirconia composites respectively. The corresponding batches were prepared semi-dry pressed and fired at two-stages up to 1600 °C.
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Improved high temperature thermal shock resistance of high
How does the spinel formation improve the flexibility of spinel forming alumina castables at elevated temperature in Proceedings of the 59th International Conference
Get PriceElectrolyte and Interface Engineering for Solid-State
This review introduces the development and recent progress of different types of solid-state electrolyte for sodium batteries including β-alumina NASICON sulfide-based electrolyte complex hydrides and organic electrolyte. In particular the transport mechanism ionic conductivity ionic transference number chemical/electrochemical stability and mechanical properties of solid-state
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