Method for making a piezoelectric stack

摘要

A method for making a piezoelectric stack. The stack includes a plurality of piezoelectric discs interleaved with a plurality of electrodes. Each disc has two opposing surface facets. Each electrode has a thin planar section having two opposing planar surfaces. The planar section is adapted to contact a substantial portion of the surface facets of two adjacent discs. The method includes the steps of cutting a cylindrical piezoelectric ceramic slug into discs. The two opposing surface facets of each disc is formed substantially parallel to one another and have a predetermined surface roughness. The method includes the steps of applying a conductive layer to the surface facets and etching the planar surfaces of the electrodes with an acidic solution. The etching step causes the planar surfaces to achieves a surface roughness similar to that of the predetermined surface roughness of the disc surface facets. Finally, the method includes the step of alternatively interleaving a first and second plurality of electrodes with a plurality of discs to form the piezoelectric stack.