To provide a mixed conductive powder used for a conductive paste or a thermally conductive paste and its manufacturing method.
The mixed conductive powder consists of: a nearly monodispersed conductive powder consisting of polyhedral particles and nearly scale-like particles; and partly agglomerated fine-particle agglomerates. The nearly monodispersed conductive powder is characterized as follows: the surface of copper powder is coated with silver and a ratio of copper to silver ranges from 95:5 to 70:30; small particles smaller than 30% cumulative diameter of all particles have an average aspect ratio of ≥3; and the average aspect ratio of the small particles is 1.3 times the average aspect ratio of large particles not smaller than the ≥30% cumulative diameter. The partly agglomerated fine-particle agglomerates are characterized as follows: the surface of copper powder is coated with silver and a ratio of copper to silver ranges from 95:5 to 70:30; and primary particle size is ≤0.3 μm. Moreover, the mixing ratio of the nearly monodispersed conductive powder to the partly agglomerated fine-particle agglomerates ranges from 99:1 to 90:10 by weight ratio.
COPYRIGHT: (C)2008,JPO&INPIT
Kinji Ohno
Kuwa Naoko Shima
| JP9092026A | ||||
| JP2005203304A | ||||
| JP2004169155A |
Chihata Takahata