Complex Permittivity and Microwave Heating Behavior of Rod-Shaped SiC and Oxide (SiO2, Al2O3) Mixtures

Publication date: Available online 1 June 2019Source: Materials Chemistry and PhysicsAuthor(s): Noboru Yoshikawa, Kohsaku Seki, Naoki Inoue, Sergey Komarov, Kei-ichirou Kashimura, Takashi Fujii, Hideoki FukushimaAbstractPermittivity measurement and microwave heating characteristics of rod-shaped SiC (fragmented SiC fiber) mixed with SiO2 or Al2O3 were investigated, comparing with the mixtures of other two kinds of SiC materials. Rod-shaped SiC mixtures had larger permittivity (both real and especially imaginary parts) than the other SiC mixtures, and a broad peak of loss factor (εr”) appeared around 1GHz. Effective permittivity of mixtures was not successfully fitted by Maxwell-Garnett mixing law to the rod-shaped SiC mixtures but well fitted to other kinds of SiC mixtures.The microwave heating ability of rod-shaped SiC mixtures were much superior to that of other SiC mixtures, as expected from the larger loss factors. However, differences were observed between the mixture of rod-shaped SiC with SiO2 and with γ-Al2O3 in heating behavior and in the mixture permittivity. Interactions of the rod SiC are considered different between SiO2 and γ-Al2O3 and influenced the experimental heating data.
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research