Patent ID: 9548439
Date: 2017-01-17
CPC Classifications: B06B,G01N,H01L,Y10T

Claim:
1. An ultrasonic transducer (UT) comprising a piezoelectric film sandwiched between two electrodes, wherein the film: is 2 microns to 2 mm thick; has a controlled porosity of 15-40% with micron-scale or sub-micron scale pores; and comprises piezoelectric powders having micron or submicron sizes mixed with a residue of a binder, wherein the binder residue comprises residue of a liquid or gel oxidizing agent that forms an intermediate oxidation layer on at least one of the electrodes, said at least one electrode formed of an electrically conductive material so that the UT is endowed with an ultrasonic bandwidth of at least 30%.