Characterisation of mullite – ZrO<sub>2</sub>ceramics prepared by various methods

Sedmale, Gaida Maruta; Šperberga, Ingunda; Hmelov, A. V.; Šteins, Ints

doi:10.1088/1757-899x/18/22/222014

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…1b. This composition is characterized by grains of the cubic modification of ZrO 2 [11,12]. The specimens of the hypereutectoid compositions have magnesia inclusions in the ZrO 2 matrix.…”

Section: Resultsmentioning

confidence: 99%

Thermal expansion of oxide systems on the basis of ZrO2

Promakhov¹,

Buyakova²,

Illavszky³

et al. 2014

Epitoanyag - JSBCM

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the structure and phase composition of the ceramic-based system zro 2 -mgo is studied. the dependence between the structural-phase state and the coefficient of thermal expansion of ceramic materials based on solid solutions zro 2 -mgo is demonstrated. the coefficient of thermal expansion of the system increases proportionally to the increase of the mgo content. the thermal expansion of the zro 2 -mgo ceramic materials can be described in the framework of the mixture rule taking into account the phase composition of zro 2 and the amount of magnesia grains in the matrtix. keywords: zro 2 -mgo solid solutions, coefficient of thermal expansion, mixture rule

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“…1b. This composition is characterized by grains of the cubic modification of ZrO 2 [11,12]. The specimens of the hypereutectoid compositions have magnesia inclusions in the ZrO 2 matrix.…”

Section: Resultsmentioning

confidence: 99%

Thermal expansion of oxide systems on the basis of ZrO2

Promakhov¹,

Buyakova²,

Illavszky³

et al. 2014

Epitoanyag - JSBCM

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“…This study follows first experiments of authors [3] on use of illite clay nanoparticles to promote sintering process and consolidation of mullite-ZrO2 ceramics with or without of Y2O3 additive. The impact of illite additive on phase stability, pressure strength, as well as density.…”

Section: Introductionmentioning

confidence: 90%

“…ZrO2 is dispersed in mullite matrix and provides a mechanism for "toughening" of mullite. However, mullite already starts to form at 1100 °C and the densification process remarkably runs behind [3]. To promote this process, methods or additives that stimulate the formation of small amount of liquid phase are mainly used [3]− [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Illite Clay Additive on Sintering, Phase Composition and Properties of Mullite-ZrO2 Ceramics / Illītu mālu piedevas ietekme uz mullīta-ZrO2 keramikas saķepšanu, fāžu sastāvu un īpašībām.

Sedmale¹,

Raubiška²,

Krūmiņa³

et al. 2015

Materials Science and Applied Chemistry

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-This study focuses on the influence of illite clay on changes of ZrO2 modifications after sintering and consolidation of mullite-ZrO2 ceramics with or without Y2O3 additive.It was found that mullite-ZrO2 ceramics both with 4.5 % Y2O3 additive or without it in presence of illite clay tend to have increased densification and compression strength after sintering. Presence of illite clay also promotes change of ZrO2 monoclinic phase to tetragonal phase and the presence of Y2O3 promotes change to ZrO2 cubic phase.

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“…ir parādīti malto daļiņu vidējie izmēri pēc 4 h un 10 h malšanas. Redzams, tie aptuveni ir diapazonā 400-500 nm [5], [8].…”

Section: A Izejas Pulvera Maisījumu Sagatavošanaunclassified

Blīva augsttemperatūras mullīta-ZrO2 keramika

Sedmale

Sedmalis

Šperberga

et al. 2018

SJ MSAC

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Parādīta piedevu (mālu minerāla – illīta, Si3N4, SiAlON), kā arī izejas pulveru izstrādes veida ietekme uz mullīta-ZrO2 keramikas saķepināšanas procesu (pielietojot tradicionālo saķepināšanas procesu un plazmas izlādes saķepināšanas procesu jeb SPS), fāžu sastāvu, struktūru, mehāniskajām un keramiskajām īpašībām.Mālu piedeva sekmē pulvera daļiņu izmēru samazināšanos, veicina keramikas paraugu sablīvēšanos tradicionālā saķepināšanas procesā, bet dod pretēju efektu, pielietojot SPS procesu. Silīcija nitrīda un SiAlON nanopulveru piedevas ir efektīvas SPS procesā, sasniegta paraugu spiedes izturība ap 600 MPa Si3N4 piedevas gadījumā, termiskā trieciena izturību un elastības moduļa vērtības 180 – 220 GPa, kuras termiskā trieciena 1000/20 °C rezultātā samazinās pieļaujamās robežās. Šīs vērtības ir par aptuveni 20–25 % zemākas, pielietojot SiAlON piedevu.Keramikas paraugu, kas saķepināti tradicionāli un pielietojot SPS procesu, mikrostruktūrā ir mullīta vai pseidomullīta kristāliski veidojumi ar ieslēgtiem ZrO2 graudiem, kas pārsvarā ir kubiskā modifikācijā. Galvenā atšķirība starp abos saķepināšanas procesos iegūtajiem paraugiem ir tā, ka tradicionāli saķepināto paraugu mikrostruktūrā ir novērojama ‘tukšumu’ veidošanās, kuri aizpildās ar mullīta kristāliem, it sevišķi palielinoties Si3N4 piedevai. Mikrostruktūra keramikas paraugiem, kas saķepināti ar SPS tehnoloģiju ir blīvāka – mullīta kristāli ir blīvi izvietojušies, un tiem nav mullītam raksturīgās prizmatiskās formas.Dense high-temperature mullite-ZrO2 ceramicsThe influence of some additives (clay mineral illite, Si3N4, SiAlON) and the processing of the initial powders on sintering of mullite-ZrO2 ceramics (using traditional or plasma dispersion sintering processes), composition, structure, mechanical and ceramic properties of phases is shown.The clay additive contributes to the reduction of the particle size of the powder, facilitates the densification of the ceramic samples in the traditional sintering process, but vice versa if SPS is used. Silicon nitride and SiAlON nanopowder additives are effective in the SPS process; samples reach a compressive strength of approximately 600 MPa in the case of Si3N4 additive; thermal shock resistance and elastic modulus are in the range of 180–220 GPa, which under a thermal shock of 1000/20 °C will reduce within the permissible limits. These values are about 20–25 % lower if SiAlON additive is used.The microstructure of the ceramic samples traditionally sintered or sintered using a SPS process is formed by crystalline mullite or pseudomulite crystals with enclosed ZrO2 grains that mostly are in the cubic modification. The main difference between the samples obtained in both sintering processes is that formation of voids filled with mullite crystals can be observed in the microstructure of traditionally sintered samples, especially if the amount of Si3N4 additive is increased. The microstructure of the ceramic samples sintered with SPS technology is denser – the mullite crystals are densely distributed and do not have the prismatic shape that is characteristic to mullite.

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Characterisation of mullite – ZrO₂ceramics prepared by various methods

Cited by 3 publications

References 4 publications

Thermal expansion of oxide systems on the basis of ZrO2

Thermal expansion of oxide systems on the basis of ZrO2

Effect of Illite Clay Additive on Sintering, Phase Composition and Properties of Mullite-ZrO2 Ceramics / Illītu mālu piedevas ietekme uz mullīta-ZrO2 keramikas saķepšanu, fāžu sastāvu un īpašībām.

Blīva augsttemperatūras mullīta-ZrO2 keramika

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Characterisation of mullite – ZrO2ceramics prepared by various methods

Cited by 3 publications

References 4 publications

Thermal expansion of oxide systems on the basis of ZrO2

Thermal expansion of oxide systems on the basis of ZrO2

Effect of Illite Clay Additive on Sintering, Phase Composition and Properties of Mullite-ZrO2 Ceramics / Illītu mālu piedevas ietekme uz mullīta-ZrO2 keramikas saķepšanu, fāžu sastāvu un īpašībām.

Blīva augsttemperatūras mullīta-ZrO2 keramika

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Characterisation of mullite – ZrO₂ceramics prepared by various methods