Patent ID: 6230378
Filing Date: 2001-05-15
Classification: B32B,C01G,C04B,H01L,Y10S,Y10T

Abstract:
A process of providing a piezoelectric actuator of a monolithic multilayer design, comprising the steps of:providing piezoceramic green films that are of a stoichiometric piezoceramic powder of a lead zirconium titanium type (PZT), said films having a stoichiometric excess of a heterovalent rare earth metal up to an overall content of 1 to 5 mol% and a stoichiometric excess of an additional 1 to 5 mol% of lead oxide;applying electrode layers of a paste containing silver and palladium to the green films;stacking the green films on one another to form a stack of films,laminating the stack of green films so that an alternating sequence of green films and electrode layers results in a laminated stack; andsintering the laminated stack under controlled sintering conditions of an oxidizing atmosphere at a maximum temperature of 1130.degree. C. for a period of time in a range of 30 to 120 minutes so that excess lead oxide evaporates off, a the hyperstoichiometric rare earth doping is compensated by inward diffusion of silver from the electrode layers and stoichiometric piezoceramic layers with homogeneous silver doping are obtained.