Patent · US Expired

Method for producing a piezoceramic

US5425889A · kind A · utility

3Cited by

1References

4Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Karl Lubitz · Ottobrunn, DE
Gabriele Preu · Birkenfeld, DE
Dieter Cramer · Graz, AT

Key dates

Filing date	May 5, 1994
Grant date	Jun 20, 1995
Priority date	—
Expiry date	May 5, 2014

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC04B35/49
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

In a method for producing a PZT piezoceramic, an intermediate compound is formed having the formula Zr.sub.x Ti.sub.1-x (O.sub.2 (ZTO) in a hydrothermal process. A ceramic having a desired zirconium/titanium ratio can be produced from two such ZTO powders having respectively different x-values. These powders are blended with lead oxide, and if desired with dopants, and are converted into a PZT powder by calcining. The calcined PZT powder is then sintered to form a high-density PZT ceramic which can be aligned precisely at the morphotropic phase boundary.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.