To obtain flaky copper powders suitable to a filler for electrically conductive paste.
The flaky copper powders consist of copper particles having a flaky shape with the average thickness (D) of ≥0.2 μm, and in which the 50% size (D50) in the particle size distribution is 1 to 30 μ, the aspect ratio (D50/the average thickness D) is 5 to 70, the A value in the following formula is ≤0.1, and the B value in the following formula is ≤0.5: A value=SD/(D90/D10) and B value=SD/D; wherein, D is the average thickness in 100 pieces of the particles measured by electron microscope observation; SD is the standard deviation of the thickness in 100 pieces of the particles measured by electron microscope observation; D90 is the 90% size (D90) in the particle size distribution; and D10 is the 10% size (D10) in the particle size distribution.
COPYRIGHT: (C)2005,JPO&NCIPI
Akira Hirata
Junji Harano
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Komatsu Taka