Development of an instrumented and automated single mode cavity for ceramic microwave sintering: Application to an alpha pure alumina powder

Croquesel, Jérémy; Bouvard, D.; Chaix, Jean‐Marc; Carry, C.; Saunier, Sébastien

doi:10.1016/j.matdes.2015.08.122

Cited by 34 publications

(35 citation statements)

References 25 publications

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“…The as-synthesized pellet was then heated in air in a 2.45 GHz monomode micro-wave cavity (Sairem) at different powers and dwelling times. Samples were placed at the maximum of the electrical field, according to the protocol 5 previously described by Croquesel et al [19,20]. The temperature was measured with a pyrometer located at around 20 cm of the surface of the pellet.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted reactive sintering and lithium ion conductivity of Li1.3Al0.3Ti1.7(PO4)3 solid electrolyte

Hallopeau

Brégiroux

Rousse

et al. 2018

Journal of Power Sources

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Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) materials are made of a threedimensional framework of TiO 6 octahedra and PO 4 tetrahedra, which provides several positions for Li + ions. The resulting high ionic conductivity is promising to yield electrolytes for all-solid-state Li-ion batteries. In order to elaborate dense ceramics, conventional sintering methods often use high temperature ( 1000°C) with long dwelling times (several hours) to achieve high relative density ( 90%).In this work, an innovative synthesis and processing approach is proposed. A fast and easy processing technique called microwave-assisted reactive sintering is used to both synthesize and sinter LATP ceramics with suitable properties in one single step. Pure and crystalline LATP ceramics can be achieved in only 10 min at 890 °C starting from amorphous, compacted LATP's precursors powders. Despite a relative density of 88%, the ionic conductivity measured at ambient temperature (3.15 x 10 -4 S.cm -1 ) is among the best reported so far. The study of the activation energy for Li + conduction confirms the high quality of the ceramic (purity and crystallinity) achieved by using this new approach, thus emphasizing its interest for making ion-conducting ceramics in a simple and fast way.

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Section: Introductionmentioning

confidence: 99%

Microwave-assisted reactive sintering and lithium ion conductivity of Li1.3Al0.3Ti1.7(PO4)3 solid electrolyte

Hallopeau

Brégiroux

Rousse

et al. 2018

Journal of Power Sources

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“…For instance, Brosnan et al [2] have sintered alumina in using a 2.45 GHz hybrid microwave multimode cavity. Many other works have reported similar results on various materials, mostly oxide ceramics [3][4][5][6]. All these processing methods obviously imply a high-temperature stage (>1200°C) and, in comparison to conventional technologies involving infra-red radiation heating sources (electrical or gas furnaces), the microwave technology is known to be faster and greener, with less energy consumption.…”

Section: Introductionmentioning

confidence: 77%

Tuning, Impedance Matching, and Temperature Regulation during High‐Temperature Microwave Sintering of Ceramics

Renaut

Savary

Macaigne

et al. 2018

Advances in Materials Science and Engineering

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Over the years, microwave radiation has emerged as an efficient source of energy for material processing. is technology provides a rapid and a volumetric heating of material. However, the main issues that prevent microwave technology from being widespread in material processing are temperature control regulation and heating distribution within the sample. Most of the experimental works are usually manually monitored, and their reproducibility is rarely evaluated and discussed. In this work, an originally designed 915 MHz microwave single-mode applicator for high-temperature processing is presented. e overall microwave system is described in terms of an equivalent electrical circuit. is circuit has allowed to point out the different parameters which need to be adjusted to get a fully controlled heating process. e basic principle of regulation is then depicted in terms of a block function diagram. From it, the process has been developed and tested to sinter zirconia-and spinel-based ceramics. It is clearly shown that the process can be successfully used to program multistep temperature cycles up to ∼1550°C, improving significantly the reproducibility and the ease of use of this emerging high-temperature process technology.

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“…Microwave sintering was performed in a 2 kW, 2.45 GHz single mode cavity (SAIREM, France) equipped with standard WR 340 waveguide and samples were located in a position where the electric field was supposed to be maximal. Details of the overall process, including experimental conditions, were previously reported by Croquesel et al [18]. A 19 samples were heated up to 1510 C at 10, 56 and 158 C/min and 1550 C at 25 C/min with a holding time of 5 min A 6 , G 3 and G 9 samples were heated up to 1550 C at 25 C/min with a holding time of 5 min.…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…Density changes were calculated from the sample diameter variation continuously measured by optical dilatometry [18]. For this purpose, the shrinkage was assumed to be isotropic.…”

Section: Materials and Experimentsmentioning

confidence: 99%

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Direct microwave sintering of pure alumina in a single mode cavity: Grain size and phase transformation effects

et al. 2016

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Development of an instrumented and automated single mode cavity for ceramic microwave sintering: Application to an alpha pure alumina powder

Cited by 34 publications

References 25 publications

Microwave-assisted reactive sintering and lithium ion conductivity of Li1.3Al0.3Ti1.7(PO4)3 solid electrolyte

Microwave-assisted reactive sintering and lithium ion conductivity of Li1.3Al0.3Ti1.7(PO4)3 solid electrolyte

Tuning, Impedance Matching, and Temperature Regulation during High‐Temperature Microwave Sintering of Ceramics

Direct microwave sintering of pure alumina in a single mode cavity: Grain size and phase transformation effects

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