Piezoceramic multi-layer element

摘要

According to the state of the art, piezoceramic multi-layer elements are sintered in air at temperatures of approximately 1100 DEG C or higher. Therefore, only a noble metal having a high melting temperature can be used as the inner electrode. Non-noble metals would oxidize. Therefore, a silver-palladium alloy having up to 40% palladium is normally used. However, such a measure is associated with high material costs. Lower melting temperatures of the inner electrode material, however, also require a ceramic material having correspondingly low sintering temperatures. The invention therefore proposes that an electrically non-conductive sintering additive added be added to the base material, and that the inner electrode comprise silver, preferably pure silver, as the main material component thereof, and an electrically non-conductive material component and/or a metal alloy or metal oxide mixture.

主权项

1. A method for producing a material for producing a piezoceramic multi-layer element from a piezoelectric ceramic material as a base material that sinters at temperatures below 950° C., wherein an electrically non-conductive sintering aid is added to the base material, wherein the electrically non-conductive sintering aid comprises at least one member selected from the group consisting of Na2O, K2O, P2O5, As2O5, GeO2 and InO2;
or wherein the electrically non-conductive sintering aid comprises at least one trivalent oxide selected from the group consisting of Al2O3, Fe2O3, Mn2O3 and Cr2O3; and at least one pentavalent oxide selected from the group consisting of P2O5, As2O5, Sb2O5 and Bi2O5.