For dewaxing in the investment casting process the use of microwave is steadily growing in industrial processes. The present work studies the possible influence of dewaxing on the wax properties in investment casting process using microwave oven. The wax blend made up of paraffin wax, microcrystalline wax, carnauba wax used in this work was prepared by melting in an oven equipped with a mineral oil bath. The chemical and structural stability of the wax were monitored throughout 10 dewaxing cycles, via various analyses, namely, linear shrinkage, volumetric shrinkage, hardness and roughness. The results showed that microwave dewaxing is viable, significantly decreasing the incorporation of dirt and water. The percentage of linear shrinkage and volumetric shrinkage is increasing gradually in each repeated cycle. The gradual change in linear shrinkage is less as compared to gradual change in volumetric shrinkage. The change in hardness is not following any pattern as it some times decreasing and some time increasing.
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