Electrical Characteristics of Ultrasonic Nozzle Using Multilayer Ring-Type Piezoelectric Ceramics for Light Oil Spray

In this paper, ultrasonic nozzle and its driving circuit were manufactured. And then, their electrical properties were investigated. Ultrasonic nozzle using multilayer ring-type piezoelectric ceramics was fabricated by Pb[(Mn1/3Nb2/3)(0.02)(Ni1/3Nb2/3)(0.12) (Zr0.50Ti0.50)(0.86)]O-3 (abbreviated as PMN-PNN-PZT) composition which have excellent piezoelectric characteristics. The multilayer ring-type piezoelectric ceramics using pure Ag inner electrode was sintered at 900 degrees C low temperatures. In order to drive ultrasonic nozzle, Pulse Width Modulation controller (abbreviated as PWM) of KA3525A was used. With increasing the input voltage of ultrasonic nozzle, average diameter of light oil droplet was increased up to 16V and then decreased. At the input voltage of 12 V, volume average diameter of light oil droplet showed the minimum value of 37.3 mu m and also at the input voltage of 16V, volume average diameter of fuel oil droplet showed the maximum value of 51.3 mu m.