DRIVING CHARACTERISTICS OF ULTRASONIC NOZZLE USING PSN-PMN-PZT CERAMICS

In this paper, ultrasonic nozzle and driving circuit were manufactured and their electrical properties were investigated. Ultrasonic nozzle was fabricated using Pb[(Sb1/2Nb1/2)0.035(Mn1/3Nb2/3)0.065(Zr0.49Ti0.51)0.90]O3+ 0.5wt%PbO (abbreviated as PSN-PMN-PZT) ceramics showing excellent piezoelectric characteristics. In order to drive ultrasonic nozzle, Pulse Width Modulation controller (abbreviated as PWM) of KA3525A was used. With increasing the input voltage of nozzle, average diameter of fuel oil droplet was increased up to 16 V and then decreased. At the input voltage of 12 V, volume average diameter of fuel oil droplet showed the minimum value of 37.3 μm and also at the input voltage of 16 V, volume average diameter of fuel oil droplet showed the maximum value of 51.3 μm.