| Title |
Piezoelectric properties of porous PZT ceramics for hydrophone Applications |
| Keywords |
Molten salt synthesis method ; Porous PZT ceramics ; Ultrasonic transducer |
| Abstract |
PZT powders were prepared by the molten salt synthesis method. The porous PZT ceramics were made from a mixture of PZT and polyvinylalcohol(PVA) by BURPS(Burnout Plastic Sphere) technique. The porous PZT bodies were fabricated from the green compacts with various amounts of PVA spheres. The piezoelectric coefficient d_{33} (334~350*10^{-12} C/N)of porous PZT ceramics(364*10^{-12} C/N). The figure of merit(d_{h}g_{h}) of porous PZT specimens evaluating the sensitivity for ultrasonic transducer applications was improved significantly(11~70times) in comparison with that of single phase PZT ceramics(100*10^{-15} m^{2}/N). The thickness mode coupling factor k_{t}(0.5~0.6) of porous specimens was comparable with that of single phase PZT ceramics(k_{t}=0.7). The mechanical quality factor of porous PZT specimens was smaller than 10, and thus these porous PZT ceramics would be believed as a good candidate for broad band hydrophone applications. (author). 10 refs., 7 figs.igs.igs. |