Microstructure and phase composition of the two-phase ceramic synthesized from titanium oxide and zinc oxide

Зеер, Г. М.; Zelenkova, E. G.; Николаева, Н. С.; Жарков, С. М.; Abkaryan, Artur K.; Михеев, А. А.

doi:10.2298/sos1802173z

Cited by 7 publications

(4 citation statements)

References 18 publications

(25 reference statements)

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“…One of the solutions for these demands is the application of the lightweight concretes. These materials are characterized by low density and low thermal conductivity; and thereby a good thermal insulation [4][5][6][7]. Apart from suitable thermal characteristics, lightweight concretes are often designed with available and affordable raw materials of primary or secondary origin (e.g.…”

Section: Introductionmentioning

confidence: 99%

Performances of vermiculite and perlite based thermal insulation lightweight concretes

et al. 2020

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This experimental study was conducted with an aim to investigate the effect of the elevated temperature on the mineral phase composition, microstructure and mechanical properties of the thermal insulation lightweight concretes. The first group of experimental concretes was based on the expanded vermiculite and expanded perlite used as lightweight aggregates (in 65 wt%) in combination with either ordinary Portland cement or refractory calcium aluminate cement. The mix-design of the second group of concretes comprised standard quartz aggregate, vermiculite or perlite as aggregate replacement (25 wt%) and binder (PC or CAC). A total of 10 concrete mix-designs were fabricated in form of 40?40?160 mm samples which were submitted to heat-treatment at 400?, 600?, 800? and 1000?C upon standard 28-days period of curing and hardening. The changes in crystallinity and mineral phase composition induced by temperature were monitored by X-ray diffraction technique. Microstructural visualizations of the non-fired and fired concrete samples were conducted by scanning electron microscopy accompanied with EDX analysis. The results indicated that despite the decrease in compressive strengths upon firing, investigated lightweight concretes can be categorized both as thermal insulators and structural materials.

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Section: Introductionmentioning

confidence: 99%

Performances of vermiculite and perlite based thermal insulation lightweight concretes

et al. 2020

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“…В качестве дугогасящих и дисперсноупрочняющих добавок в электроконтактные материалы на основе серебра вводили нанопорошки оксида цинка, оксида олова, а также комплексную добавку, состоящую из нанопорошков оксидов цинка, олова и титана [23][24][25][26][27][28]. Использование нанопорошков позволяет уменьшить весовое количество оксидов в составе образцов в 3−4 раза, что снижает их влияние на электропроводность образца в целом.…”

Section: результаты и обсуждениеunclassified

Электроконтактный Материал На Основе Серебра, Дисперсноупроченный Оксидами Цинка, Олова И Титана

Зеер¹,

Зеленкова²,

Сидорак³

et al. 2020

Журнал Технической Физики

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A new electrocontact materal based on silver has been obtained. The material has been dispersion-strengthened by nanopowders of zinc oxide, stannum oxide and titanium oxide. The microstructure and elemental composition of the phases have been formed at solid-phase sintering and electroerosion tests have been studied by the methods of scanning electron microscopy and energy-dispersive X-ray spectroscopy. The electroerosion wear and transitional resistivity have been determined as a result of laboratory testing. The developed electrocontact materal has demonstrated physical, mechanical and exploitational properties similar to the properties of an electrocontact materal based on toxic cadmium oxide

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“…The final properties and behaviors will always be related to the actual microstructural configuration. This relation has to be established for better microstructural design [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…The reaction sintering process has been widely employed for sintering refractory powders. During the thermal treatment, the consolidation process is achieved simultaneously with one or more chemical processes [1,5,6,[23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Dense alumina-mullite composite ceramics from alumina and spodumene-albite feldspar binary mixtures: Processing and properties

et al. 2019

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A processing strategy for obtaining alumina-spodumene ceramics from fine commercial powders is presented. In this work, a spodumene addition to calcined alumina powder was performed and their proportion was explored between 15 and 45 wt%. The industrial spodumene presented secondary phases, mainly albite and quartz. Mechanical properties were evaluated. Although they were lower than those of sintered alumina, based on the achieved values an adequate behavior in structural applications can be assumed, especially taking into account that the better mechanical behavior was coupled with the lower thermal expansion. Relatively low thermal expansion (≈ 5 x 10-1 °C-1) behaviors were observed in one of the developed materials. Noncrystalline phases containing lithium were detected. We assume that all the lithium oxide incorporated through the spodumene is in the glassy phase after the sintering of the materials. This difference in lithium concentration in the composition of the resulting glass affected the thermal expansion of the developed materials. Particularly with low lithium content (30 wt% of additive) the material performance was enhanced. This, together with the mechanical behavior, encourages structural applications with high thermomechanical solicitations. With the information gathered, a wide range of materials with specific properties can be obtained by modulating the spodumene-alumina proportion only.

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Microstructure and phase composition of the two-phase ceramic synthesized from titanium oxide and zinc oxide

Cited by 7 publications

References 18 publications

Performances of vermiculite and perlite based thermal insulation lightweight concretes

Performances of vermiculite and perlite based thermal insulation lightweight concretes

Электроконтактный Материал На Основе Серебра, Дисперсноупроченный Оксидами Цинка, Олова И Титана

Dense alumina-mullite composite ceramics from alumina and spodumene-albite feldspar binary mixtures: Processing and properties

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