The Dielectric Curing Process

There are basically two forms of dielectric heating radio-frequency and microwave. Radio-frequency heating uses a frequency (13 to 100 MHz) to generate heat in polar materials. The electrodes are generally designed into the platens of a press, and they are 

FIGURE 14.7 Illustration of dielectric heating for the bonding of an electrogalvanized steel (EGS)/ SMC lap shear joint.30 

The Federal Communications Commission in the United States regulates microwave usage, and the frequencies for heating are designated by the International Telecommunications Union (ITU). The allowed frequencies most commonly used in the United States are 915 MHz and 2.45 GHz. 

TABLE 14.8 Strength of RF Dielectrically Bonded Adhesive Joints (SMC to steel)32 

Adherends Adhesive Tensile shear strength, MPa Failure mode 

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