Stacked piezoceramic element, useful in a fuel injection device, comprises piezoceramic layers and inner electrode layers that are alternately stacked upon the piezoceramic layers

摘要

Stacked piezoceramic element (Q), comprises piezoceramic layers (11) and inner electrode layers (12, 13) that are alternately stacked upon the piezoceramic layers; where: each of the inner electrode layers consists of an electrically conductive metal and a material of lead zirconate titanate (PZT) family with a B1-site substituent, in which 0.1-1 mol.% of a B1-site element of the PZT material, depicted by a basic composition (Q1) is substituted by at least a bivalent or trivalent transitional metal element M; and each of the piezoceramic layers are composed of a main component. Stacked piezoceramic element (Q), comprises piezoceramic layers (11) and inner electrode layers (12, 13) that are alternately stacked upon the piezoceramic layers; where: each of the inner electrode layers consists of an electrically conductive metal and a material of lead zirconate titanate (PZT) family with a B1-site substituent, in which 0.1-1 mol.% of a B1-site element of the PZT material, depicted by a basic composition (Q1) with a formula (AB1O 3) is substituted by at least a bivalent or trivalent transitional metal element M; and each of the piezoceramic layers are composed of a main component, which is made up of the PZT material, in which the B1-site element is not substituted. An independent claim is included for a process for obtaining (Q) comprising fabrication of the non-sintered and molded ceramic layers (green body) (15) containing a first ceramic raw material, which after a sintering step forms the material of the PZT family of piezoceramic layers; fabrication of an electrode material by mixing an electrically conductive metal powder and a second ceramic raw material, which after a sintering step forms the material of the PZT family with B-site substituent of the inner electrode layers; application of the electrode material on each of the non-sintered and molded ceramic layers; stacking of the non-sintered and molded ceramic layers that are coated with the electrode material, so as to form an intermediate stacked structure; and sintering of the intermediate stacked structure, where the step of making the electrode material uses a second ceramic raw material comprising at least one of the following alternatives: a composite material composed of an initial material mixture containing ceramic raw materials, which are blended in a mixing ratio that forms the material of the PZT family in a specified composition after a sintering step, an oxidative product of the transition metal element M, which is added to the initial material mixture in a mixing ratio of 0.1-1 mol.% of a B-site element of the material of PZT family to be substituted by the transition metal element M, a calcined composite material of a initial material powder, which is composed of a calcined initial material powder that was obtained by calcinations and powdering of the composite material, and a calcined raw material powder composite, which consists of a calcined raw material powder, by calcination of raw material mixture and powder, and an oxide product of the transition metal element M together in a mixing ratio mixed, which allows 0.1-1 mol.% of the B-site element of the material PZT family to be substituted by the transition metal element M.