An ultrasonic equipment with magnetostrictive ferrite vibrator can supply an increased ultrasonic output power with increasing bonding-strength between ferrite vibrator and its water tank or its metallic horn, etc. For this purpose, a novel solder-jointing method is developed for a ferrite vibrator. In this method, a ferrite surface is reduced to a metallic state before soldering, using a titanium alloy power, so that soldering on it can be easily done. The bonding-strengh of this method for ferrite-to-ferrite boding is compared with that of adhering method with an epoxy-resin, using acousic vibration methods. It is found that the former is more thermally stable and more than twice as strong as the latter. In an ultrasonic radiation test into water, a ferrite vibrator solder-jointed by this method is found to work stably for 24 hours at 15 W/cm^2 corresponding to five times of power rating for commercial ferrite vibrators. These results indicate that this method can give far stronger bonding-strength than the usual epoxy-resin adhering method dose.
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