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Use of Polyalkylene Carbonate Binders for Improved Performance in Multilayer Ceramic Capacitors
Keywords: Polyalkylene carbonate binders, Multilayer ceramic capacitors, Ni Ba Ti interfacial alloy layer
Past work by Polotai and co-workers produced convincing evidence that a Ni-Ba-Ti alloy layer forms at the electrode/dielectric interface of multilayer ceramic capacitors (MLCC's) made with Ni electrodes and a barium titanate based dielectric. It has been shown that this alloy layer can lead to discontinuous electrodes, resulting in reduced capacitance and lower reliability. The most likely explanation is that the alloy layer results from residual carbon remaining after the binders used to make the tape and paste are decomposed. Polypropylene carbonate binder is known for its extremely clean burnout properties so a multilayer structure was prepared from QPAC® polypropylene carbonate binder in both the dielectric tape and nickel electrode paste. This was compared against a multilayer structure prepared using PVB binder for the dielectric tape and a nickel paste based on ethyl cellulose. Examination of the fired parts by TEM clearly showed the elimination of the interfacial layer when using the polypropylene carbonate binder system. Good electrode continuity was also obtained.
Peter Ferraro, Director of Business Development
Empower Materials Inc.
New Castle, DE

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