Communication Dans Un Congrès Année : 2024

Microwave sintered SnO2-ZnO based ceramics

Résumé

Ceramics based on tin oxide (SnO2) and zinc oxide (ZnO) are important for various types of applications, including varistors, electrodes, gas sensors or catalysts. SnO2 ceramics is a very specific material because a non-densifying sintering mechanism is usually dominating during sintering. On the other hand, in ZnO ceramics the dominant sintering mechanism is densifying, therfore it is much easier to obtain a highly dense material by conventional sintering compared to SnO2 ceramics. Combining ZnO and SnO2 it is possible to create a composite containing the spinel phase Zn2SnO4, which could significantly improve the properties of the material. In this contribution we present results obtained for SnO2 and ZnO ceramics and its composite prepared by microwave (MW-) sintering and compared them with results obtained on conventionally (CV-) sintered samples [1, 2]. Samples were prepared from commercial powders of SnO2 and ZnO which were used in pure form but also mixed in different weight ratios (8:2, 2:8, 1:1). These powders were uniaxially pressed, and the sintering process was done in a multi-mode MW-cavity with and without the SiC susceptor. Different thermal cycles were used by varying the sintering temperature, heating rate, dwell time and the number of the heating cycles. After sintering the samples were characterized by measuring linear shrinkage, bulk density, porosity, phase composition and elastic properties were measured on chosen samples. Concerning and investigation of the MW process it was possible to sinter all the samples with and also without the SiC susceptor, which proves that investigated materials have sufficient dielectric properties for the MW- sintering. Apart from that during the sintering certain areas were observed where more incident power was needed to initiate the sample heating, this fact is connected with the specific material property. When comparing the CV- and MW- sintered samples, in case of pure oxides (SnO2 and ZnO) no changes between CV- and MW- sintered samples were observed. However, in case of composites significant differences were observed especially for the sample batch which was mixed to obtain mostly the spinel phase Zn2SnO4. Therefore, it was found that MW- sintering have a positive influence on densification and therefore the creation of the Zn2SnO4. References: [1] Šimonová P., Gregorová E., Pabst W.: Young's modulus evolution during sintering and thermal cycling of pure tin oxide ceramics. J. Eur. Ceram., 41, 7816-7827 (2021). [2] Šimonová P., Kotrbová L., Pabst W., Nečina V., Bezdička P.: Elastic properties and microstructure evolution of ceramics based on tin oxide and zinc oxide prepared by conventional sintering. J. Eur. Ceram. (in review)

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Dates et versions

hal-04909670 , version 1 (24-01-2025)

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  • HAL Id : hal-04909670 , version 1

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Petra Simonova, Clémence Petit, Willy Pabst, Christophe Meunier, François Valdivieso. Microwave sintered SnO2-ZnO based ceramics. 29th Annual Doctoral Seminar Inorganic Non-metallic Materials 2024, Feb 2024, Prague, Czech Republic. ⟨hal-04909670⟩

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