Low-temperature calcined ceramics
US5889322A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1997 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Dec 1, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K1/0306
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A low-temperature calcined ceramic of the present invention comprises a sintered body obtained by calcining a mixture of a glass and an SiO.sub.2 filler such as quartz or cristobalite, wherein the sintered body contains an SiO.sub.2 crystal having an X-ray diffraction image that the peak at the (101) plane of quartz or cristobalite is shifted at least 0.05.degree. (2.theta.) to the lower angle side. The ceramic containing the shifted crystal of quarts or cristobalite does not have a region of abruptly changing the thermal expansion and has a substantially linear thermal expansion curve. Accordingly, when the ceramic is used as an insulating substrate of a wiring boad, there is no possibility of abruptly causing the thermal expansion by heating, etc., at mounting on an external electric circuit boad and the occurrence of the inferior connection, etc., by thermal expansion can be effectively prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.