Insulative ceramic composition
US4783431A · kind A · utility
3Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1987 |
| Grant date | Nov 8, 1988 |
| Priority date | — |
| Expiry date | Jul 9, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K1/0306
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An insulative ceramic composition comprising from 25 to 60 wt % of Al.sub.2 O.sub.3, from 10 to 40 wt % of SiO.sub.2, from 3 to 30 wt % of from B.sub.2 O.sub.3, from 1 to 15 wt % of MgO, from 0.2 to 10 wt % of Cr.sub.2 O.sub.3, from 0.1 to 3 wt % of Li.sub.2 O, and from 1 to 20 wt % of at least one member selected from the group consisting of CaO, SrO and BaO. The ceramic composition has a small coefficient of linear expansion and can avoid cracking when undergoing thermal shock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.