Piezoelectric ceramic-epoxy composite and method of making same

摘要

A piezoelectric ceramic-epoxy composite comprising particles predominantly 1/2 λ (half wavelength) in thickness of piezoelectric ceramic and epoxy also disclosed is a method of making a piezoelectric ceramic-epoxy composite. The method comprises mixing ceramic powder with a particle size in the range of about 3/4 λ to 1-1/2 λ and, preferably, predominantly larger than 1/2 λ average particle size with non-polymerized epoxy in the proportion of 20% to 65% ceramic powder, by volume and spreading the ceramic-epoxy mixture on a flat substrate to a thickness of approximately the size of the powder particles. The mixture is then evacuated to remove air bubbles and the epoxy is cured to produce a sheet of ceramic and epoxy. The sheet is surface ground to 1/2 λ (half wavelength) of a predetermined resonant frequency.