This work presents an improved microwave multimodc cavity for porcelain tableware sintering. It includes 6 magnetrons, each one with a nominal power of 1kW at 2.45 GHz. The distribution of the electromagnetic field inside the cavity is calculated using the COMSOL Multiphysics software. The improved automated control system comprises the use of a pyrometer that allows the analysis of the thermal delay between the temperature given by a thermocouple and the real temperature in the porcelain material. Results exclude the existence of the so-called non-thermal microwave effect, recognized in some literature. Physical properties, such as density, rupture energy and impact resistance, are compared with those of tableware obtained by conventional methods. The improved microwave oven allows a better temperature measurement, with a faster sintering with the same quality standards than the conventional sintered porcelain.
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