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An experimental investigation to find the critical (coupling) temperature in microwave hybrid heating of bulk metallic materials

Melting of bulk metals is successfully achieved by microwave hybrid heating. This technique is used because of the tendency of bulk metals to reflect microwaves at room temperature. Available literature indicates that metallic materials start to absorb microwaves at certain elevated temperature. However, the temperature at which microwaves are absorbed by the target metallic material is not known. In the present work, an effort is made to find out the temperature from which uniform heating of the bulk metals takes place. Bulk non-ferrous metals like tin, brass, zinc, and aluminium are melted by microwave irradiation. Time-temperature profiles for each experiment is plotted and the range between which uniform heating of bulk metal takes place is observed. It is observed that the uniform heating starts from the temperature which is nearly half of the melting temperature of the metal being processed.