Investigations of Lead-Free Glasses for Post-Fired and Embedded Thick Film Resistors

Abstract:

Lead-free thick film resistors (TFRs) were prepared by mixing of ruthenium oxide (RuO₂) and CaO-B₂O₃-SiO₂ based-glass. The resistors were post-fired on alumina and co-fired in LTCC substrates. Different metal oxides were added into the glass phase, such as Nb₂O₅, MnO₂, MoO₃, Fe₂O₃, TiO₂. They were used as temperature coefficient of resistor (TCR) adjustment agents of the resistors. The microstructures variations and interactions at the interface between resistors and substrates were investigated. The additives made glass structure loose and conductivity of resistor decrease, the TCR values of the resistors moved toward negative direction. When 4wt% MnO₂ was added into the glass, the thick-film resistors embedded in LTCC had conductivity of 2.46 (Ω-cm)^-1, the temperature coefficient of resistor decreased to 12 ppm/°C. The conductivities of the resistors films were depended on the volume fractions of conductor-agglomeration (RuO₂), microstructures, and TCR additives of the resistor layers

• Periodical: Key Engineering Materials (Volume 573)
• Pages: 137-142
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.573.137
• Online since: September 2013
• Authors: Shen Li Fu, Chi Shiung Hsi, Chun Yueh Kang, Hua Pin Chen, Siou Jyun Wang
• Keywords: Lead-Free, LTCC Material, TCR, Thick Film Resistor

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