Alumina ceramic body
US4735926A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1986 |
| Grant date | Apr 5, 1988 |
| Priority date | — |
| Expiry date | Mar 14, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/111
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A dielectric alumina ceramic body having a constant dielectric loss tangent tan .delta. is obtained by sintering a composition consisting essentially of: PA1 100 parts by weight of a ternary formulation consisting of 92.4 to 98.7 mol % Al.sub.2 O.sub.3, at least 0.5 mol % CaO, and 1.3 to 7.6 mol % TiO.sub.2 ; and PA1 at least one selected from the group consisting of Cr.sub.2 O.sub.3 and NiO subject to the relation of: ##EQU1## where x is the weight part of Cr.sub.2 O.sub.3 per 100 parts by weight of said formulation, PA1 y is the weight part of NiO per 100 parts by weight of said formulation, and PA1 z is the mol % of Al.sub.2 O.sub.3 in the formulation, PA1 provided that x.gtoreq.0 and y.gtoreq.0, except x=y=0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.