High-alumina cembor cements for low-cement refractory concretes

Migal, V. P.; Skurikhin, V. V.; Gershkovich, S. I.; Fedorova, O. S.; Rusakova, G. V.; Alekseev, P. E.

doi:10.1007/s11148-012-9452-z

Cited by 5 publications

(3 citation statements)

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“…As a result, heterogeneous products of variable phase composition are formed, containing various amounts of CA and CA 2 as the major phases, and C 12 A 7 and unreacted α-Al 2 O 3 as side phases. However, there are only a few contemporary works devoted to the theoretical and practical aspects of the preparation of ultra-pure highalumina clinkers [16][17][18].…”

Section: Inorganic Materials and Nanomaterialsmentioning

confidence: 99%

“…As a consequence of the great practical importance of CA and CA 2 , the synthesis of these compounds has become the subject of a number of studies aimed at increasing the yield of target phases and decreasing the process temperature and time [9][10][11][12][13][14][15][16][17][18]. Various technological approaches were used in those studies, namely, self-propagating high-temperature synthesis [19,20], spray drying [21], mechanochemical activation of precursors [22], the Pechini process [23], and the sol-gel method [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Phase Formation Specifics in the High-Alumina Region of the СаО–Al2О3 System

Trubitsyn

Furda

Yapryntsev

et al. 2022

Russ. J. Inorg. Chem.

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Phase formation of calcium monoaluminate and calcium dialuminate in the СаО–Al2О3 system in the range 230–1450°C was studied using a model powder mixture comprising aluminum and calcium hydroxides. The onset of formation of an intermediate phase Ca12Al14O33 (С12А7) was observed at 430°С. At 1100°С, the appearance of CaAl4O7 (CA2) and the presence of κ-Al2O3 were observed. The onset of intense formation of the CaAl2O4 (СА) phase is at 1170°С. In the range 1250–1400°С, the CA amount increases notably, while the СА2 proportion remains almost unchanged. The final formation of the CA and CA2 target phases occurs in 2 h at 1450°С. The syntheses of CA and CA2 is controlled by Ca2+ diffusion inward the aluminum-enriched cores of spherulites. Energy dispersive X-ray spectroscopy elucidated the CA and CA2 distribution in the form of concentric layers.

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Section: Inorganic Materials and Nanomaterialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase Formation Specifics in the High-Alumina Region of the СаО–Al2О3 System

Trubitsyn

Furda

Yapryntsev

et al. 2022

Russ. J. Inorg. Chem.

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“…They have a wide variety of allotropes and different geometric structures, and are mainly used for refractory materials, calcium aluminate cements, optoelectronic devices, etc. [1,2]. Among them, monocalcium aluminate (CaAl 2 O 4 ) is mainly used for hydraulic cements, refractory castables, optical devices, and structural materials [3].…”

Section: Introductionmentioning

confidence: 99%

Electronic, Optical, and Lattice Dynamical Properties of Tetracalcium Trialuminate (Ca4Al6O13)

Mei¹,

Zhong²,

Wang³

et al. 2018

Materials

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The electronic, optical, and lattice dynamical properties of tetracalcium trialuminate (Ca4Al6O13) with a special sodalite cage structure were calculated based on the density functional theory. Theoretical results show that Ca4Al6O13 is ductile and weakly anisotropic. The calculated Young’s modulus and Poisson ratio are 34.18 GPa and 0.32, respectively. Ca4Al6O13 is an indirect-gap semiconductor with a band gap of 5.41 eV. The top of the valence band derives from O 2p states, and the bottom of conduction band consists of Ca 3d states. Transitions from O 2p, 2s states to empty Ca 4s, 3d and Al 3s, 3p states constitute the major peaks of the imaginary part of the dielectric function. Ca4Al6O13 is a good UV absorber for photoelectric devices due to the high absorption coefficient and low reflectivity. The lattice vibration analysis reveals that O atoms contribute to the high-frequency portions of the phonon spectra, while Ca and Al atoms make important contributions to the middle- and low-frequency portions. At the center of the first Brillouin zone, lattice vibrations include the Raman active modes (E, A1), infrared active mode (T2), and silentmodes (T1, A2). Typical atomic displacement patterns were also investigated to understand the vibration modes more intuitively.

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Application of refractory materials for steel ladles

Stoianov,

Niziaev,

Malii

et al. 2023

PSTU

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The article analyzes the service life of refractories and various options for combined lining of steel ladles used in steelmaking shops with out-of-furnace steel processing departments, and identifies the main trends in its development. The use of various types of lining is analyzed based on the experience of Japan, Germany, Austria, and France. The technological conditions of operation of steel ladles with the main lining are considered. Under operating conditions, the lining areas near the slag belt and the place where the jet hits the bottom of the ladle are subject to the greatest destruction, so it is advisable to install high-quality refractories in these areas. In addition, the reasons for the insufficient stability of refractories are identified, including decarburization, corrosion, ladle slag formed during out-of-furnace metal processing, the use of synthetic additives to slag, high thermal conductivity of refractory materials during operation, and others. Ways to increase the service life of steel ladles are identified. It is shown that the world practice is characterized by the use and intensive improvement of the main lining of steel ladles through the use of new materials with increased refractory and operational characteristics. The experience of refractory improvement by Shinagawa Refractories, TYK Corp, Plibrico, Nippon Steel, Krosaki Harima, and IPSCO Steel, including practical testing at production, is presented. It is established that the high cost of consumables and increased requirements for manufacturing technology hinder the massive introduction of the developed technologies at metallurgical enterprises

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High-alumina cembor cements for low-cement refractory concretes

Cited by 5 publications

References 0 publications

Phase Formation Specifics in the High-Alumina Region of the СаО–Al2О3 System

Phase Formation Specifics in the High-Alumina Region of the СаО–Al2О3 System

Electronic, Optical, and Lattice Dynamical Properties of Tetracalcium Trialuminate (Ca4Al6O13)

Application of refractory materials for steel ladles

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