Effect of microwave and conventional sintering on densification, microstructure and dielectric properties of BZT–xCr2O3 ceramics

Manivannan, Swathi; Joseph, Andrews; Sharma, Pramod K.; Raju, K. C. James; Das, Dibakar

doi:10.1016/j.ceramint.2015.05.035

Cited by 13 publications

(2 citation statements)

References 27 publications

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“…This dependence varies greatly depending on temperature and increases rapidly with increasing temperature, making microwave heating extremely difficult to control for these types of materials [6]. Thus, ceramic microwave heating is mainly assisted by a susceptor, a material with a high dielectric loss at room temperature, that transmits heat to the part being sintered mainly by radiation [8]. Since the demonstration of the possibility of sintering ceramics by microwave heating by Berteaud and Badot in 1976 many works have been published without the technique being used other than for drying or melting [9].…”

Section: Introductionmentioning

confidence: 99%

Direct Microwave Sintering of Poorly Coupled Ceramics in Electrochemical Devices

Amiri

Etsell

Sarkar

2022

J. Electrochem. Sci. Technol

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The use of microwaves as the energy source for synthesis and sintering of ceramics offers substantial advantages compared to conventional gas-fired and electric resistance furnaces. Benefits include much shorter processing times and reaching the sintering temperature more quickly, resulting in superior final product quality. Most oxide ceramics poorly interact with microwave irradiation at low temperatures; thus, a more complex setup including a susceptor is needed, which makes the whole process very complicated. This investigation pursued a new approach, which enabled us to use microwave irradiation directly in poorly coupled oxides. In many solid-state electrochemical devices, the support is either metal or can be reduced to metal. Metal powders in the support can act as an internal susceptor and heat the entire cell. Then sufficient interaction of microwave irradiation and ceramic material can occur as the sample temperature increases. This microwave heating and exothermic reaction of oxidation of the support can sinter the ceramic very efficiently without any external susceptor. In this study, yttria stabilized zirconia (YSZ) and a Ni-YSZ cermet support were used as an example. The cermet was used as the support, and a YSZ electrolyte was coated and sintered directly using microwave irradiation without the use of any susceptor. The results were compared to a similar cell prepared using a conventional electric furnace. The leakage test and full cell power measurement results revealed a fully leak-free electrolyte. Scanning electron microscopy and density measurements show that microwave sintered samples have lower open porosity in the electrode support than conventional heat treatment. This technique offers an efficient way to directly use microwave irradiation to sinter thin film ceramics without a susceptor.

show abstract

Section: Introductionmentioning

confidence: 99%

Direct Microwave Sintering of Poorly Coupled Ceramics in Electrochemical Devices

Amiri

Etsell

Sarkar

2022

J. Electrochem. Sci. Technol

View full text Add to dashboard Cite

show abstract

“…The microwave sintering can give rise to dense materials at lower temperatures and shortened sintering periods compared to those of conventional sintering [30][31][32][33]. Isolating materials such as silicon dioxide or alumina are supposed to be heated above 600 °C in order to generate time-dependent electric dipoles that can absorb the microwave energy [34].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Conventional and Microwave Sintering of BaCe1 − xGdxO3 − δ Ceramic

Borges

Gonçalves

Correa

et al. 2017

J Inorg Organomet Polym

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Effects of Ca2+ substitution on microstructure and microwave dielectric properties of low loss Ba(Mg1/3Nb2/3)O3 perovskite ceramics

Wang

et al. 2019

J Mater Sci: Mater Electron

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Effect of microwave and conventional sintering on densification, microstructure and dielectric properties of BZT–xCr2O3 ceramics

Cited by 13 publications

References 27 publications

Direct Microwave Sintering of Poorly Coupled Ceramics in Electrochemical Devices

Direct Microwave Sintering of Poorly Coupled Ceramics in Electrochemical Devices

A Comparative Study of Conventional and Microwave Sintering of BaCe1 − xGdxO3 − δ Ceramic

Effects of Ca2+ substitution on microstructure and microwave dielectric properties of low loss Ba(Mg1/3Nb2/3)O3 perovskite ceramics

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