Abstract
We reported on characteristics of the piezoelectric ceramic-polymer composite for the application of the thick-film speaker. The PVDF-PZT composites were fabricated to incorporate the advantages of both ceramic and polymer with various mixing ratios by 3-roll mill mixer. The composite solutions were coated by the conventional screen-printing method on ITO electrode coated PET (Polyethylene terephthalate) polymer film. After depositing the top-electrode of silver-paste, 4 kV/mm of DC field was applied at <TEX>$120^{\circ}C$</TEX> for 30 min to poling the composite films. The value of <TEX>$d_{33}$</TEX> (piezoelectric charge constant) was increased when the PZT weight percent was increased. The maximum value of the <TEX>$d_{33}$</TEX> was 24 pC/N at 70 wt% PZT. But the <TEX>$g{33}$</TEX> (piezoelectric voltage constant) showed the maximum value of <TEX>$32mV{\cdot}m/N$</TEX> at 65 wt% of PZT powder. The SPL (sound pressure level) of the speaker fabricated with the 65:35 composite film was about 68 dB at 1 kHz.
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