Improved compaction in multilayer capacitor fabrication

Citation
Aw. Tavernor et al., Improved compaction in multilayer capacitor fabrication, J EUR CERAM, 19(9), 1999, pp. 1691-1695
Citations number
9
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
ISSN journal
09552219 → ACNP
Volume
19
Issue
9
Year of publication
1999
Pages
1691 - 1695
Database
ISI
SICI code
0955-2219(1999)19:9<1691:ICIMCF>2.0.ZU;2-X
Abstract
The most common defects found in multi-layer ceramic capacitors are derived from residual porosity formed when solvents and binders are released from a ceramic green body. Without a well-controlled compaction technique, defec ts between sheets in the stacked body are often present, leading to laminat ion problems. This paper suggests alternative approaches, using compaction applied before and/or after the process of binder burnout with the intentio n of reducing the number of stacking-generated defects and the volume of vo ids formed after binder burn-out. Barium titanate tapes and stacked multila yer electroded discs have been investigated and characterised by microstruc tural examination and density measurement. The resulting properties are des cribed, and the behaviour of the multi-layers discussed in terms of the Mic rostructure and processing procedures. It is shown that the porosity conten t of sintered samples compacted at 300 MPa is approximately half that of sa mples compacted at 30 MPa when both are sintered at 1300 degrees C for 2 h. A further improvement of densification cart be achieved by a postcompactio n treatment after binder burn out. (C) 1999 Elsevier Science Limited. All r ights reserved.