Pressure-assisted microwave sintering: A rapid process to sinter submicron sized grained MgAl2O4 transparent ceramics

Kerbart, Gabriel; Harnois, Christelle; Bilot, Christelle

doi:10.1016/j.jeurceramsoc.2019.03.046

Cited by 19 publications

(4 citation statements)

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“…However, compared to other techniques, such as SPS or vacuum sintering, which have been widely used in both academic research and industry for the fabrication of high-quality transparent ceramics of a variety of materials systems, microwave sintering is still at a relatively early stage of development. Densification of transparent ceramic systems by microwave heating has been successfully conducted in compositions such as YSZ [94] and MgAl 2 O 4 [95]. Microwave sintering enables the densification of ceramics through the absorption of microwave radiation by the material and conversion of the electromagnetic energy to thermal energy, which is then distributed with high uniformity throughout the sample.…”

Section: Sintering Techniques For Transparent Ceramicsmentioning

confidence: 99%

“…Microwave sintering also allows for much higher grain growth rates; however, the underlying reasons remain incompletely understood. Although the average grain size in MgAl 2 O 4 is in the sub-micrometer range, approximately 550 nm [95], thus conferring notable hardness and fracture toughness, this result has been achieved after just 10 min of sintering. Interestingly, with longer sintering times, the remaining porosity increases because of grain sliding, which acts as the primary source of light scattering and decreased optical transmittance in the visible range.…”

Section: Sintering Techniques For Transparent Ceramicsmentioning

confidence: 99%

“…Annealing in the air or other oxygen-rich environments is also beneficial for eliminating coloration. conducted in compositions such as YSZ [94] and MgAl2O4 [95]. Microwave sintering enables the densification of ceramics through the absorption of microwave radiation by the material and conversion of the electromagnetic energy to thermal energy, which is then distributed with high uniformity throughout the sample.…”

Section: Sintering Techniques For Transparent Ceramicsmentioning

confidence: 99%

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Crystallization of glass materials into transparent optical ceramics

Milisavljevic

Pitcher

et al. 2022

International Materials Reviews

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Latest advancements in transparent ceramics development have ensured a mainstream research interest in this family of materials. Crystallization of glass into transparent ceramics has emerged recently as an alternative but complementary trajectory for obtaining transparent ceramics, which circumvents some of the long-standing technical difficulties associated with traditional transparent ceramics processing. The full bulk glass crystallization allows for the synthesis of high-density/low-porosity transparent ceramics of stable and metastable phases or even non-cubic structures, which are difficult to obtain using the traditional processing methods. This article presents a brief survey of the science of the transparency of ceramics and a detailed overview of the materials systems and techniques used for the preparation of transparent ceramics through the glass crystallization route. Finally, the review provides authors' insights into the future trends and research directions aimed to encourage a widespread application of glass crystallization into transparent ceramics in the fabrication of next-generation materials.

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Section: Sintering Techniques For Transparent Ceramicsmentioning

confidence: 99%

Section: Sintering Techniques For Transparent Ceramicsmentioning

confidence: 99%

Section: Sintering Techniques For Transparent Ceramicsmentioning

confidence: 99%

See 1 more Smart Citation

Crystallization of glass materials into transparent optical ceramics

Milisavljevic

Pitcher

et al. 2022

International Materials Reviews

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“…Recently, with the continuous innovation of sintering technology, increasing numbers of different sintering techniques have been used to prepare MgAl 2 O 4 ceramics, including: spark plasma sintering [16], pressure assisted microwave sintering [17], pressureless sintering [13], reactive sintering followed by HIP [5], dilatometry [18], and the most advanced hot pressing (HP) [19]. In particular, HP has been recognized as an advanced method for ceramic fabrication.…”

Section: Introductionmentioning

confidence: 99%

Characterization of MgAl2O4 sintered ceramics

et al. 2019

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Single phase MgAl 2 O 4 was made from a one-to-one molar ratio of MgO and Al 2 O 3 powders mixed using ball-milling. Mixtures of MgO and Al 2 O 3 were subsequently treated in planetary ball mill for 30, 60, 90 and 120 minutes in air. The aim of this study was to examine phase composition, microstructure, and densification behavior of sintered specimens. After sintering in dilatometer at 1500 °C, the powder was converted to single phase MgAl 2 O 4. The results show that mechanical activation improved the densification behavior of MgAl 2 O 4 sintered specimens, and it reduced the onset temperature for sintering by approx. 100 o C. Based on dilatometer data, powders were subsequently densified at 1450 o C by hot pressing. Almost аll specimens exhibited full density, while sample activated for 30 minutes showed the fastest densification rate.

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