Sintering in global material perspective

Upadhyaya, G. S.

doi:10.2298/sos1804501u

Cited by 5 publications

(10 citation statements)

References 10 publications

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“…II Phases formed at different temperatures (°C) and their peak positions (cm -1 ). In this work, monolithic cordierite and anorthite containing cordierite materials were developed by solid-state sintering method [47,48]. These ceramic materials might have potential industrial applications.…”

Section: Resultsmentioning

confidence: 99%

Formation of anorthite containing cordierite materials through reaction sintering kaolin, MgO and CaO precursors

et al. 2020

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The effect of CaO on cordierite formation from kaolin-MgO-CaO powder mixtures, milled for 5 h and reaction sintered for 2 h in the temperature range 900-1400?C, was investigated. Phases formed in the developed materials were characterized by x-ray powder diffraction method (XRD) and Raman spectroscopy. Non-isothermal differential thermal analysis (DTA) and thermogravimetric (TG) experiments were performed from room temperature to 1400?C, at heating rates from 20 to 40?C/min. Activation energies were determined using Kissinger method. It was found that sintering the stoichiometric kaolin-magnesia mixture led to the nucleation and growth of monolithic cordierite; while cordierite along with anorthite were present in the other two samples where 4 or 8 wt% of CaO was added. The increase in CaO decreased cordierite formation temperature and increased the activation energy, which ranged from 445 to 619 kJ/mol for ?-cordierite and from 604 to 1335 kJ/mol for ?-cordierite.

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Section: Resultsmentioning

confidence: 99%

Formation of anorthite containing cordierite materials through reaction sintering kaolin, MgO and CaO precursors

et al. 2020

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“…This initial powder was activated in a planetary mill with zirconium oxide balls (Retsch PM 400) for time duration of 30 min, 60 min, 90 min, 120 min, 150 min, 180 min, 210 min, 240 min, 270 min and 300 min in the air atmosphere with a rotational speed of 400 rpm. After the milling samples were pressed into tablets (discs) and toroids under pressure of 392 MPa and 1 GPa successively and then sintered [14] in the air atmosphere of a laboratory oven for 2 h at 1200 °C. Investigation of the sintered samples surface was performed using Carl Zeiss Jena optical microscope, with a 50W halogen lamp and a 100x magnification.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Evolution of structural and functional properties of the Fe/BaTiO3 system guided by mechanochemical and thermal treatment

et al. 2020

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Multiferroic systems are attractive to the researches worldwide due to diversity of existing applications, as well as possible novel ones. In order to contribute to understanding of the processes that take place within the structure of such a system, we subjected it to mechanochemical activation and thermal treatment. Powdery mixtures of iron and barium titanate in a mass ratio of 30% Fe and 70% BaTiO3 were activated in a planetary ball mill for time duration of 30 to 300 min and subsequently sintered at 1200?C in the atmosphere of air. During the activation the system undergoes structural phase transitions, whereby the content of iron and its oxides changes. The highest Fe content was observed in the sample activated for 270 min, with local maxima in crystallite size and microstrain values and a minimum in dislocation density. The complex dielectric permittivity changes in the applied radio frequency field, rangingfrom 176.9 pF/m in thesample activated for 90 min to 918.1 pF/m in the sample activated for 180 min. As the frequency of the field increases, an exponential decrease in the magnetic with a simultaneous increase in the electrical energy losses is noticeable. The system exhibits ferromagnetic resonance, whereby longer activation in the mill shifts the resonant frequency to higher values. Negative electrical resistance was observed in all analyzed samples. The activation time changes both the demagnetization temperature and the Curie temperature of the samples undergoing heating and cooling cycles in the external permanent magnetic field. Curie temperature is the highest in the sample activated for 240 min. Thermal treatment increases the initial magnetization of all samples, with the most pronounced increase of ~95% in the sample activated for 300 min. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. OI 172057]

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“…In [1], a technology that makes it possible to realize the low-temperature synthesis of bricks from high-siliceous clays by the method of plastic molding of blanks was presented, though it is known that ceramics of this type is usually obtained from clays by dry or semidry pressing of blanks with subsequent high-temperature sintering [1][2][3][4][5][6]. It was established that for the initiation of the plastic properties of the material, it is necessary to introduce a small amount of montmorillonite/bentonite and water into high-siliceous clay.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature sintering of high-siliceous clay under conditions of oxygen deficiency

et al. 2021

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In the work, the processes of phase reconstruction and properties of ceramics obtained from high-siliceous clay-sand, clay-cullet, and clay-sand-cullet mixtures are considered. It is possible to perform plastic molding of blanks from the given mixtures due to the presence of montmorillonite in clay and sand and sintering at 800 oC for 8 h under conditions of oxygen deficiency. Depending on the composition of the initial mixtures, specimens ranging in color from gray to black can be obtained. It has been established by the XRD, IR spectroscopy, and electron microscopy methods that the synthesized material is glass ceramics consisting of quartz, feldspars, and a glass phase. Depending on the content of the initial components in the mixtures, it is possible to obtain glass ceramics with high strength properties or coarse-pored glass ceramics whose properties are similar to those of foamed ceramics.

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Sintering in global material perspective

Abstract: nema

Cited by 5 publications

References 10 publications

Formation of anorthite containing cordierite materials through reaction sintering kaolin, MgO and CaO precursors

Formation of anorthite containing cordierite materials through reaction sintering kaolin, MgO and CaO precursors

Evolution of structural and functional properties of the Fe/BaTiO3 system guided by mechanochemical and thermal treatment

Low-temperature sintering of high-siliceous clay under conditions of oxygen deficiency

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