Thick film resistor paste and resistors therefrom

A resistor composition in weight % adapted to be applied to a ceramic substrate for firing at elevated temperatures to form a resistor having stable electrical and physical properties, said composition comprising about 18 to 20% Ag, about 14 to 24% RuO.sub.2, about 4 to 8% Sb.sub.2 O.sub.3, about 10 to 12% CdO, about 35 to 48% lead-borosilicate glass, up to about 4% Ta.sub.2 0.sub.5 and up to about 2% of at least one of the transition metal oxides selected from the group consisting of Cr.sub.2 O.sub.3, NiO, CuO, ZnO, and Mn.sub.2 O.sub.3, the metal oxides and silver being used without prereaction.

A resistor composition in weight % adapted to be applied to a ceramic substrate for firing at elevated temperatures to form a resistor having stable electrical and physical properties, said composition comprising about 17 to 19% RuO.sub.2, about 18-19% Ag, about 4-5% Sb.sub.2 O.sub.3, about 10 to 12% CdO, about 44% lead-borosilicate glass, about 3-4% Ta.sub.2 O.sub.5 and about 0.7-1% of a mixture of about 80% Mn.sub.2 O.sub.3, 17% NiO and 3% ZnO, the metal oxides and silver being used without pre-reaction.

A resistor element having stable electrical and physical properties comprising an electrically non-conducting substrate having a resistance coating fired thereon at a peak temperature of from 700.degree.-900.degree. C., said coating being formed from a batch composition comprising, in weight %, about 35 to 70% lead-borosilicate glass and the following un-prereacted noble metal oxides:

• silver in the amount of about 10-20%, about 5-24% RuO.sub.2, about 3-8% Sb.sub.2 O.sub.3, about 8-12% CdO, up to about 4% Ta.sub.2 O.sub.5 and up to about 2% of at least one thermistor powder selected from the group consisting of NiO, Cr.sub.2 O.sub.3, CuO, ZnO and Mn.sub.2 O.sub.3.

A resistor element having stable electrical and physical properties comprising an electrically non-conducting substrate having a resistance coating fired thereon at a peak temperature of from 700.degree.-900.degree. C., said coating being formed from a batch composition comprising about 18 to 20% Ag, about 14 to 24% RuO.sub.2, about 4 to 8% Sb.sub.2 O.sub.3, about 10 to 12% CdO, about 35 to 48% lead-borosilicate glass, up to about 4% Ta.sub.2 O.sub.5 and up to about 2% of at least one of the transition metal oxides selected from the group consisting of Cr.sub.2 O.sub.3, CuO, ZnO, NiO, and Mn.sub.2 O.sub.3.

A resistor element having stable electrical and physical properties comprising an electrically non-conducting substrate having a resistance coating fired thereon at a peak temperature of from 700.degree.-900.degree. C., said coating being formed from a batch composition comprising about 17 to 19% RuO.sub.2, about 18-19% Ag, about 4-5% Sb.sub.2 O.sub.3, about 10 to 12% CdO, about 44% lead-borosilicate glass, about 3-4% Ta.sub.2 O.sub.5 and about 0.7-1% of a mixture of about 80% Mn.sub.2 O.sub.3, 17% NiO and 3% ZnO.