Paper Title:
Control of Shrinkage Behavior and Thermal Expansion Coefficient in BaTiO3-Added Ni Electrodes
  Abstract

In this study, shrinkage behavior and coefficient of thermal expansion (CTE) of novel nickel (Ni) powder with an addition of dielectric material, BaTiO3, have been investigated to reduce the large shrinkage mismatch between Ni electrode and dielectric material and to control the thermal and/or residual stresses created by CTE mismatch in MLCCs (multilayer ceramic capacitors). For which two kinds of Ni powders were used. The component of Ni powders is analyzed by XRF, and the thermal behavior is measured by TG/DTA. The Ni and BaTiO3 powders were mixed with 9:1, 8:2, and 7:3 volume ratios. The BaTiO3-added Ni green bodies were fabricated through cold isostatic pressing, and then sintered to 1300°C in a reduction atmosphere. The shrinkage behavior with volume ratio was checked during sintering from 700 to 1300°C with 300°C interval. The CTE was measured in inert (argon) atmosphere with sintered samples. It is found that the shrinkage behavior and the CTE of Ni electrode are dependent on the volume of BaTiO3 added. The particle size of Ni powder also affects the microstructure and its sintering density, with less effect of its component.

  Info
Periodical
Key Engineering Materials (Volumes 336-338)
Edited by
Wei Pan and Jianghong Gong
Pages
765-768
DOI
10.4028/www.scientific.net/KEM.336-338.765
Citation
S. H. Park, J. H. Kang, S. S. Lee, Y. G. Jung, U. Y. Paik, "Control of Shrinkage Behavior and Thermal Expansion Coefficient in BaTiO3-Added Ni Electrodes", Key Engineering Materials, Vols. 336-338, pp. 765-768, 2007
Online since
April 2007
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$32.00
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