Powder of oxide for dielectric ceramics and a process for producing dielectric ceramics
US5204031A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1992 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Jan 30, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2002/34
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A powder of oxide which is a material for dielectric ceramics including perovskite-type double oxide containing lead, and a process for producing dielectric ceramics using the powder. In the process of this invention, perovskite-type double oxide containing lead are initially produced by means of hydrothermal reaction, and the powder is heat-treated at 500.degree. to 1000.degree. C. Consequently, the specific surface area of the powder becomes 20 m.sup.2 /g or less. The powder is mixed with binder and compressed, molded and debinded, and consequently, the compact attains 50% or more of theoretical density. Thereafter, the compact is sintered. As a result, the process of manufacture according to the present invention is capable of producing dielectric ceramics, wherein deformation and cracks do not occur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.