Abstract
The preparation of screen-printing inks with a high solids load was studied for the development of thick-film varistors. A high solids load can ensure a higher green density of the films for enhanced densification and microstructure development in order, to obtain good current–voltage (I–U) characteristics for the thick-film varistor, even after short firing times at temperatures below 1000°C. The inks with a solids load of 50, 60 and 70wt.% enabled the preparation of thick-film varistors on an alumina substrate with a homogenous microstructure, a uniformly distributed Bi2O3-rich phase and a good varistor film-electrode contact after firing at 900°C for 15min. However, the porosity of the films gradually decreased with the increasing solids load and a varistor film prepared from the ink with the highest solids load of 70wt.% had minimal porosity and improved I–U characteristics in comparison with the other samples.
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