Microwave Processing at the University of Florida

Clark, David E.; Folz, D. C.; Schulz, R. L.; Fathi, Z.; Cozzi, A. D.; Boonyapiwat, A.; Komarenko, P.; DiFiore, R.; Jones, C. B.

doi:10.1557/proc-347-489

Cited by 10 publications

(8 citation statements)

References 1 publication

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“…[9][10][11][12] High heating rate is widely recognized as a potential, important advantage of microwave sintering, due to direct, volumetric, instant absorption of microwave power in the sample. [9][10][11][12] High heating rate is widely recognized as a potential, important advantage of microwave sintering, due to direct, volumetric, instant absorption of microwave power in the sample.…”

Section: Introductionmentioning

confidence: 99%

Microwave sintering of ZnO at ultra high heating rates

Lloyd

Carmel

et al. 2001

J. Mater. Res.

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In this paper, a unique processing approach for producing a tailored, externally controlled microstructure in zinc oxide using very high heating rates (to 4900°C/min) in a microwave environment is discussed. Detailed data on the densification, grain growth, and grain size uniformity as a function of heating rate are presented. With increasing heating rate, the grain size decreased while grain size uniformity increased. At extremely high heating rates, high density can be achieved with almost complete suppression of grain growth. Ultrarapid microwave heating of ZnO also enhanced densification rates by up to 4 orders of magnitude compared to slow microwave heating. The results indicate that the densification mechanisms are different for slow and rapid heating rates. Since the mechanical, thermal, dielectric, and optical properties of ceramics depend on microstructure, ultrarapid heating may lead to advanced ceramics with tailored microstructure and enhanced properties.

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Section: Introductionmentioning

confidence: 99%

Microwave sintering of ZnO at ultra high heating rates

Lloyd

Carmel

et al. 2001

J. Mater. Res.

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“…1 Microwave irradiation has also been used for the sintering of ceramic particles. 2,3 Many researchers have used this process for metal and metal powders, since Roy et al reported that this process yields dense products with excellent mechanical properties. 4 This seminal study spurred many investigations focused on the heating of metal thin films and the sintering of powder metals.…”

Section: Introductionmentioning

confidence: 99%

Microwave sintering of Ag-nanoparticle thin films on a polyimide substrate

et al. 2015

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Ag-nanoparticle thin films on a polyimide substrate were subjected to microwave sintering by use of a single-mode waveguide applicator. A two-step sintering process was employed. First, at low conductivities of the film, the film sample was placed at the site of the maximum electric field and subjected to microwave irradiation. Second, when the conductivity of the film increased, the film sample was placed at the site of the maximum magnetic field and again subjected to microwave irradiation. The microwave sintering process was completed within 1.5 min, which is significantly lower than the time required for the oven heating process. The resulting conductivity of the film, albeit only 30% of that of the bulk material, was seven times that of a film annealed at the same temperature in a furnace. Scanning electron microscopy images revealed that the nanoparticles underwent both grain necking and grain growth during microwave sintering. In addition, this sintering process was equivalent to the oven heating process performed at a 50 °C higher annealing temperature. An electromagnetic wave simulation and a heat transfer simulation of the microwave sintering process were performed to gain a thorough understanding of the process.

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“…Among a variety of sintering methods, microwave heating has attracted much interest during the last 20 years and is widely explored for the sintering of ceramics because it is a timeeffective sintering process [9][10][11]. Conventional sintering such as ambient-pressure sintering, hot-pressing, and hot isostatic pressing relies on thermal conduction from heating element to the material's surface.…”

Section: Introductionmentioning

confidence: 99%