At the Forschungszentrum Karlsruhe, Germany, a compact 30 GHz gyrotron system has been established in order to investigate technological applications in the field of high temperature materials processing by means of microwave radiation in the millimeter wave (mm-wave) range. Besides the improvement of the system design, research activities are mainly engaged in studies on debindering and sintering of various types of advanced structural and functional ceramics. The use of microwaves at 30 GHz distinguishes from the widespread industrial microwaves with frequency of 2.45 GHz and 0.915 GHz with respect to field and therefore heating homogeneity. Furthermore for low loss materials such as most interesting technical ceramics (Al_2O_3 or Si_3N_4), dielectric absorption and therefore heating at higher frequencies is stronger.
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