Rapid-Rate Sintering of ZnO by Microwave Heating

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Abstract
ZnO was sintered successfully by microwave. A ZnO powder compact was placed in a quartz tube and exposed to 2.45GHz microwave (0.1-0.8kW) for 30min. Response of ZnO was examined by measuring the surface temperature of specimens. When the power input was sufficient, the specimens were heated to 800°-1000°C within a few minutes. The temperature was nearly constant during the exposure, and did not exceed 1000°C. In this case, the specimens were sintered to almost theoretical densities. If the power input was not sufficient, however, the specimens were not heated at all and no shrinkage was observed. The response of ZnO was quicker for larger specimens. The densities and the microstructures of ZnO sintered by microwave and conventional furnace were compared.

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