Sintering Aids for LTCC Electronic Elements — Heating Microscope Studies and Microstructure Analysis |
| B. Synkiewicz, A. Skwarek, D. Szwagierczak, J. Kulawik
Institute of Electron Technology, Kraków Division, Zabłocie 39, 30-701 Kraków, Poland |
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| The effect of a few low melting compounds, mixtures, and glasses on the sintering temperature of microwave and varistor ceramics, destined for multilayer LTCC elements, was analyzed in a heating microscope. It was found that 5 wt% of Li2CO3, LiF or 0.5AlF3-0.5CaB4O7 causes a significant decrease in the sintering temperature of willemite Zn2SiO4, enabling its co-sintering with commercial AgPd pastes. Addition of 5 wt% of Li2CO3 or 50 wt% of SiO2-B2O3-Al2O3-CaO-MgO glass leads to the same effect in the case of another candidate for microwave substrates - diopside CaMgSi2O6. For two varistor ceramics, based on doped ZnO and Cu2Ta4O12 perovskite, 0.5 and 4 wt% of AlF3-CaB4O7 mixture was used as an efficient sintering aid. Good sinterability at low temperatures of the microwave and varistor ceramics with modified composition was confirmed by scanning electron microscope studies. |
DOI:10.12693/APhysPolA.135.564 topics: sintering aids, varistor, microwave ceramics, heating microscope studies, SEM studies |