Experimental study on dielectric properties of SiC material and temperature distribution of rubber materials containing silicon carbide coated metal via microwave heating

Abstract

Microwave heating has not been widely used in the heating process of the rubber products containing metal skeleton, because the metal reflects microwaves that leads to a large amount of heat in the metal-rubber contact surface due to the skin effect and the eddy current effect in the microwave field. This experiment investigated the effects of microwave frequency and temperature on the dielectric parameters of silicon carbide coating materials. The microwave heating process of rubber composites containing metal skeleton coate d with SiC mixture was also investigated experimentally. The results are as follows: As the microwave frequency increases, the dielectric parameters of the SiC coating material increase slowly first, when the frequency reaches a certain point, the dielectric parameters increase sharply to a maximum after that fall rapidly; Based on microwave frequency of 2450MHz, the dielectric constants of three different compositions of SiC coating materials decrease with increasing temperature; The temperature of the rubber composite containing the steel wire coated with the SiC is lower than the rubber composite containing the steel wire naked. The larger the content of SiC, the more uniform the temperature distribution, and the more effective the weakening of the sparks phenomenon caused by the skin effect.