Abstract :
Ultra-thinning of Ni paste films for BMEMLCC
(Base Metal Electrode Multilayered Ceramic
Capacitor) internal electrode was investigated. Adding
various dispersants, ball-milling powder, and using the
pre-dispersion process to improve Ni paste dispersion
and properties of the paste electrodes/thick films, were
employed. The paste containing 200 nm sized Ni powders,
ethyl cellulose vehicle (g = 2.98 · 104 mPa-s at
0.1 s–1), and Emphos PS-21A as a dispersant proved to
be the most desirable candidate. This paste thick film
showed the smallest surface roughness (Ra = 0.10 lm
and Rmax = 0.97 lm) at a viscosity (g = 2.80 · 105 mPas
at 0.1 s–1) adaptable to screen-printing. In addition, the
Ni paste/thick film had the low sheet resistivity
(q = 1.11 · 10–4 Wcm) and an excellent microstructure
after sintering at 1,290 C for 3 h in a 97% N2/3% H2
atmosphere.
