Patent ID: 7476342
Filing Date: 2009-01-13
Classification: C03C,H01C

Abstract:
1. A resistor composition comprising: a lead-free ruthenium-based electrically conductive component, a lead-free glass having a glass basicity Po value of 0.4 to 0.9 and an organic vehicle; wherein the lead-free glass consists of: 5 to 30 mol % of B 2 O 3 , 1 to 20 mol % of Al 2 O 3 , a total content of 20 to 60 mol % of CaO, BaO and SrO, 20 to 50 mol % of SiO 2 , 20 mol % or less of ZrO 2 , and 10 mol % or less of R 2 O, where R is an alkaline metal element, and, optionally, at least one of Nb 2 O 5 , Ta 2 O 5 , TiO 2 , CuO, MnO 2 , La 2 O 3 and ZnO in a total content of 1 to 10 mol % and at least one of WO 3 , MoO 3 and SnO 2 , and unavoidable impurities and wherein the resistor composition forms dispersed MSi 2 Al 2 O 8 crystals, where M is selected from the group consisting of Ba, Sr and mixtures thereof, in a glass matrix of a thick film resistor obtained by firing the composition.