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Electrode‐Based Causes of Delaminations in Multilayer Ceramic Capacitors
Author(s) -
Pepin John G.,
Borland William,
O'Callaghan Patrick,
Young Richard J. S.
Publication year - 1989
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1989.tb06076.x
Subject(s) - materials science , electrode , delamination (geology) , composite material , dielectric , shrinkage , ceramic capacitor , capacitor , ceramic , sintering , optoelectronics , voltage , electrical engineering , chemistry , paleontology , biology , subduction , tectonics , engineering
Delaminations are a principal quality problem in the manufacture of multilayer ceramic capacitors (MLC's). They are defined as a separation of the electrode and dielectric layers and can result in electrical shorts and/or life failures. Delaminations originate from many sources in MLC manufacture, but we have identified four which are caused by the electrode. High levels of organic resin in the electrode paste lead to high resin content in dried electrode prints, requiring removal of large amounts of organic residues during burnout, causing delaminations. Catalysis of these organics by the precious metals also causes delaminations from rapid evolution of gas and heat release during burnout. Poor adhesion of the dielectric tape layers to dried electrode prints during MLC buildup can cause “green‐state” delaminations which remain through firing. Sintering shrinkage mismatch between the electrode and dielectric layers leads to internal stresses in MLC's, resulting in delaminations. We discuss these electrode‐based mechanisms of delamination and the design of electrode pastes which solve these problems.