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URN etd-0617108-141931 Statistics This thesis had been viewed 3478 times. Download 2289 times. Author Hung-Ta Chang Author's Email Address No Public. Department Materials Engineering Year 2007 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 72 Title Co-firing of the Cordierite Based Glass-Ceramic Substrates with Ag/Pd Conductors Keyword Tape Casting α-Cordierite Glass-Ceramic Substrate Ag/Pd Conductor Co-firing Co-firing Ag/Pd Conductor Substrate Glass-Ceramic α-Cordierite Tape Casting Abstract The co-firing properties of the cordierite based glass-ceramic substrate with Ag/Pd electrodes are correlated to a number of factors, including Pd oxidation/reduction during the sintering process, the reaction of the substrate with Ag/Pd electrodes, Ag diffusion and migration, organic vehicle, and sintering shrinkage mismatch between electrode and di-electric layer.
In the present study, multilayer glass-ceramic substrate containingα- Cordierite andβ- Spodumene were co-fired with Ag/Pd electrodes. The green tape of MgO．Al2O3．SiO2．B2O3．P2O5 (MAS) 80wt% / Li2O． Al2O3．2SiO2．B2O3．P2O5(LAS)20wt% are prepared by the tape casting process, then low-resistivity Ag/Pd electrodes paste is applied onto the sheets by printing. These printed green sheets are laminated together by press machine. The objective of this investigation is to evaluate the materials compatibility and low-temperature co-firing aspects of the cordierite based glass-ceramic substrates with Ag/Pd electrodes. The heat-treatment parameters of sintering temperature, sintering time and heating rate will be studied. The stages of firing are 140oC for 2hr-285oC for 2hr-495oC for 2hr-925oC for 4hr (heating rate 1oC/min). In this investigation, the MgO-containing substrates with the co-fired Ag/Pd electrodes revealed a four-layer structure with abnormal Ag-, Bi-, and Mg-distributions near the electrode-substrate interface when 85Ag/15Pd electrode was used. This phenomenon disappeared when 70Ag/30Pd was used. It is thought that the existence of Bi2O3 in the electrode and MgO in the substrate might be responsible for anomaly.
Advisor Committee Jiin-Jyh Shyu - advisor
Hong-Wen Wang - co-chair
Jiin-Jyh Shyu - co-chair
Yi Hu - co-chair
Files Date of Defense 2008-05-16 Date of Submission 2008-06-19