Piezoceramic multi-layer element

US9598319B2 · kind B2 · utility

Assignee

• CERAMTEC GMBH · DE

Inventors

• Reiner Bindig · Bindlach, DE
• Hans-Jürgen Schreiner · Lauf an der Pegnitz, DE

Key dates

• Filing date: Oct 20, 2008
• Grant date: Mar 21, 2017
• Expiry date: Jun 28, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/768
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

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.