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Joining of silicon nitride as well as silicon carbide to itself was studied by the microwave heating method. The joining was carried out easily in a short time by covering the joining part with a mullite insulating fire brick during application of microwave. There was a peak in the bending strength-heating time curve. The maximum value increased and the time, at which the maximum value was reached, decreased with increasing joining temperature. The hardness of the joined region was higher than that of the matrix. The maximum bending strength of the joint of silicon nitride ceramics was 87% of the matrix strength when joined at 1750°C and 5MPa for 10min. On the other hand the maximum bending strength of silicon carbide ceramics was 71% of the matrix strength when joined at 2050°C and 8MPa for 5min.

Microwave Joining of Ceramics, Silicon Nitride and Silicon Carbide