H - Electricity – 05 – K
Patent
H - Electricity
05
K
31/121, 356/17
H05K 1/02 (2006.01) B32B 18/00 (2006.01) H01B 1/02 (2006.01) H01B 1/08 (2006.01) H01L 21/48 (2006.01) H01L 23/498 (2006.01) H05K 1/09 (2006.01) H05K 3/46 (2006.01) H05K 1/03 (2006.01)
Patent
CA 2004231
ABSTRACT OF THE DISCLOSURE Vias having virtually no pores are formed in a multi- layer ceramic substrate by filling through holes of green sheets with a conducting material consisting of a mixture of copper powder particles and copper oxide powder particles, each coated with an organic titanium compound, and firing the green sheets. The conducting material may be obtained by: kneading mixed copper oxide powder particles and copper powder particles with a solution of an organic titanium compound; drying and cracking the kneaded mixed powder particles; classifying the cracked mixed powder particles; and making the classified mixed powder particles spherical. The multi- layer ceramic substrate may be used as a printed wiring sub- strate for electronic devices.
Fetherstonhaugh & Co.
Fujitsu Limited
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