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Tuning, impedance matching and temperature regulation in high temperature microwave sintering of ceramics

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Document pages: 8 pages

Abstract: Over the years, microwave radiation has become an effective energy for material processing. This technology provides rapid volume heating of materials. However, the main problems that hinder the wide application of microwave technology in material processing are temperature control and heating distribution in the sample. Most of the experimental work is usually monitored manually, and its reproducibility is rarely evaluated and discussed. In this work, an initially designed 915   introduces a MHz microwave single-mode applicator for high temperature treatment. The whole microwave system is described by equivalent circuit. The circuit allows to indicate the different parameters that need to be adjusted to obtain an adequate responseontrolled heating process. The basic principle of regulation is then depicted in terms of a block function diagram. From it, the process has been developed and tested to sinter zirconia- and spinel-based ceramics. It is clearly shown that the process can be successfully used to program multistep temperature cycles up to ∼1550°C, improving significantly the reproducibility and the ease of use of this emerging high-temperature process technology.

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