Heating Behavior of Silicon Carbide Fiber Mat under Microwave

Abstract

A small diameter of SiC fiber mat can produce much higher heat under microwave irradiation than the other types of SiC materials. Fabrication of high strength SiC fiber consists of iodine vapor curing on polycarbosilane precursor and heat treatment process. The curing stage of polycarbosilane fiber was maintained at 150-200 o C in a vacuum condition under the iodine vapor to fabricate a high thermal radiation SiC fiber. The structure and morphology of the fibers were characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TG) and scanning electron microscopy (SEM). In this study, the thermal properties of SiC fiber mats under microwave have been analyzed with an IR thermal camera and its image analyzer. The prepared SiC fiber mats radiated high temperature with extremely high heating rate up to 1100 o C in 30 seconds. The fabricated SiC fiber mats were not oxidized after the heat radiation process under the microwave irradiation.

Heat-Generating Behavior of SiC Fiber Mat Composites Embedded with Ceramic Powder for Heat Conservation

“…It has been reported that the heat-generating behavior of SiC fiber sheets fabricated via electrospinning depends on the sheet thickness and the number of SiC fiber layers. 10,11) Therefore, the thickness of the SMCs prepared under different pressures was controlled (during the heat treatment process under the inert atmosphere) in this study.…”

“…This is because the ceramic powder penetrated the SiC fibers under excessive pressure, which reduced the necking of the SiC fibers. 10) The heat-generating characteristics for the fiber mat and SMCs are summarized in Table 2. The SiC fiber mat without the ceramic powder consisted of a single material only.…”

“…9) Polymer-derived silicon carbide (SiC) fibers are promising high-temperature and high-efficiency heating elements and structural materials. 10,11) Upon interaction with microwave energy, amorphous SiC fibers generate heat (above 1400ºC) in about 40-60 s. Moreover, these fibers exhibit long lifetimes without burning or melting at temperatures as high as 1400°C owing to their high heat resistance. Hence, the heat-generating behavior of polymer-derived SiC fibers has been investigated extensively to realize their heating element applications for rapid heat treatment.…”

“…17) In this study, a fine ceramic powder prepared by grinding barley stone was inserted into SiC fiber mats to preserve the generated heat by the interaction of SiC fibers with microwave energy. In addition, as the heat-generating behavior of SiC fibers changes under the application of pressure during the heat treatment process, 10) the pyrolysis process was carried out under different pressures to analyze C the heat-generating behavior of the SiC fibers in terms of their bonding with the ceramic powder.…”