Dielectric ceramic composition and a multilayer ceramic capacitor and a method of manufacturing a multilayer ceramic capacitor
US5004715A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1990 |
| Grant date | Apr 2, 1991 |
| Priority date | — |
| Expiry date | Feb 22, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/499
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A low temperature sintering dielectric ceramic composition, which exhibits high dielectric constant, low dielectric loss, high electrical resistivity, high mechanical strength and narrow grain size distribution, is disclosed. The ceramic composition is a binary system comprising lead magnesium niobate (Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3) and copper oxide, or a ternary system comprising lead magnesium niobate (Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3), lead titanate (PbTiO.sub.3) and copper oxide. A multilayer ceramic capacitor comprising internal copper electrodes and ceramic dielectric layers consisting of the dielectric ceramic composition is also disclosed. A method of readily manufacturing the multilayer ceramic capacitor with copper internal electrodes is also disclosed. This fabrication method comprises a stop of forming a multilayer laminate by the green tape multilayer laminating method using dielectric ceramic tapes and a conductor paste containing CuO as its main component; a step of heat-treatment for decomposing and removing organic binder in air (binder removing process); a step of reducing CuO in the internal electrode layers to copper by heat-treatment in a mixed gas atmospher…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.