Publications and Papers
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Physical test properties
of electrode powders do not alone dictate performance characteristics of
electrode pastes and final electrical properties in MLC devices.
Frequently, the nature of organic-organic (solvents-resin-surfactants)
and organic-inorganic (electrode powder and dielectric material)
reactions is largely ignored in conductive paste applications. These
competing reactions contribute to electrode powder agglomeration,
electrode laydown and roughness, as well as paste stability and
printability. In addition to standard fineness of grind (FOG) and low
angle light (LAL) tests on electrode pastes, this paper examines optical
polarized light microscopy performed to evaluate dispersion
characteristics of electrode powders in the ‘wet’ state, during drying,
and dried films. Paste stability is compared for different paste
formulations and powder varieties using time dependent turbidity
measurements on real systems.
powders for MLCC applications are produced by the chemical vapor
decomposition (CVD) method based on the decomposition of Ni
carbonyl gas. Several pastes were prepared from vehicles to evaluate the
behavior of powder in different vehicle systems. The performance of the
pastes was evaluated by viscosity measurement, Low Angle Light images
(LAL) and FOG, during and after paste processing. The compatibility of
powder with these vehicles was also assessed. Performance of the
pastes was evaluated after various surface treatments. The stability of
the pastes was assessed after accelerated aging test.
- CARTS EUROPE 2004 --
Electrical Performance Characteristics of MLCC's With Low Laydown AgPd
AgPd electrodes still see
widespread use in passive component applications, even with the conversion
to using base metal replacements such as nickel and copper. As a consequence
of design and cost, MLCC’s using AgPd alloys as electrodes must meet the
demands of high performance, small case sizes, and low costs. This paper
reports the electrical performance characteristics of MLCC’s made with
70%Ag30%Pd electrodes and 95%Ag5%Pd electrodes as a function of MLCC case
size and metal laydown.