Method for producing ceramic surfaces with easily removable contact sheets
US6139666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1999 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | May 26, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2203/308
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for making multilayer ceramic substrates having substantially reduced planar shrinkage and distortion resulting from the firing or sintering process. Contact sheets are employed in the fabrication process on the surface of the multilayer ceramic substrate to be fired with the contact sheets being prepared from a composition containing a non-sinterable non-metallic inorganic material such as alumina having an average particle size approximately about 1 micron or less and an organic binder and preferably a plasticizer. In a preferred embodiment of the invention, the multilayer structure to be fired containing the contact sheet of the invention is provided with a beveled or chamfered edge at an angle of greater than about 60 degrees. A fabrication process employing only chamfering of the edge or the use of a contact sheet of the invention also provides improved multilayer ceramic substrate products. A further feature is a method to control the surface topography of surface metallization by adjusting the compressibility of the contact sheets during fabrication of the substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.