Abstract
SiC fiber-MO2 (M = Ce, Zr) mixtures with various compositions were heated by applying an 80 W microwave electric field, to investigate their heating rate, maximum temperature, and dielectric constant. For the SiC fiber-CeO2 mixture, all three parameters continued to increase as the weight ratio of the SiC fiber increased; in contrast, for the SiC fiber-ZrO2 mixture, these parameters reached a maximum value at a certain composition. A thermal gradient of 500 °C was observed at a microlevel in the SiC fiber-ZrO2 mixture, and hot spots were located in regions with a certain composition. This result not only contributes to designing a novel good microwave absorber but also presents new aspects with regard to high-temperature microwave processing, including the mechanism behind the high-temperature gradients on the order of micrometers as well as engineering applications that utilize these high-temperature gradients.
Highlights
Microwave (MW) heating is widely employed in high-temperature processes such as fly ash sintering [1], asbestos detoxification [2], and other functional material synthesis [3,4]
A spherical shape was assumed for the measurements, the average particle diameters obtained by laser diffractometry were comparable to those observed in the Scanning Electron Microscope (SEM) images
We can rule out the effect of polarizability, as the polarizability of SiC fibers is not improved upon surrounding them with ZrO2 particles
Summary
Microwave (MW) heating is widely employed in high-temperature processes such as fly ash sintering [1], asbestos detoxification [2], and other functional material synthesis [3,4]. MWs to heat and sinter metallic glass to obtain Ni60 Nb20 Ti15 Zr5 porous samples with a diameter of 20 mm. The fields of these studies differ greatly (environmental, chemical, and metallurgical processes); all required temperatures of 1000 ◦ C or more, making MW heating ideal for these processes. To efficiently maintain a high temperature in a sample during MW heating, the sample material must be able to convert MW energy into thermal energy.
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