Subsolidus phase equilibria in the RuO2–ZnO–SiO2 system
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Thick-film resistors are made by screen-printing thick-film paste on insulating, mainly alumina, substrates. After printing and drying, the thick-film pastes are fired in a belt furnace. Thick-film resistor pastes consist basically of a conducting phase, a lead borosilicate-based glass phase and an organic vehicle. The organic material is burned out between 300 and 400 °C during the high-temperature processing. The ratio between the conductive and glass phases roughly determines the specific resistivity of the resistor. In most modern resistor compositions the conductive phase is either RuO2 or ruthenates. The glass phase is based on the B2O3–PbO–SiO2 glasses with the molar ratio of SiO2/PbO approximately equal to 2. Some other oxides are also added as modifiers of the temperature coefficient of expansion and/or the glass-transition temperature [1, 2, 3, 4, 5].
The well-known European environmental legislation, i.e., the RoHS Directive (restriction of the use of certain...
KeywordsRuO2 Glass Phase Conductive Phase Zn2SiO4 Ruthenium Oxide
The financial support of the Slovenian Research Agency is gratefully acknowledged.
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