E.i. Dupont De Nemours and Company

Lewis Charles Hoffman

Arthur Harvey Mones

Charles William McMunn

Oliver Alton Short

Samuel Jacob Horowitz

Thick film resistors, based on pyrochlore conductive phase, glass, and refractory fillers having a thermal expansion coefficient range of 40.times.10.sup.-7 -60.times.10.sup.-7 /.degree. C. and low solubility in the glass, are provided. Such thick film resistor pastes afford resistors having excellent stability to mechanical or thermal stresses.

Stable pyrochlore resistor compositions

Copper-based metallizations, useful in the electronics art, comprising copper powder and certain alkali metal/lead borosilicate glass powders. The copper and glass may be dispersed in an inert liquid vehicle, printed on a substrate, and fired in a nitrogen atmosphere to produce conductor patterns. Also the resultant fired conductor patterns.

Copper metallizations

This invention relates to dispersions of gold and a certain inorganic binder in an inert liquid vehicle, useful in the electronics art for producing conductor patterns adherent to substrates. Small amounts of the binder are effective in producing excellent adhesion to substrates, such as ceramic substrates. The binders comprise certain amounts of the crystalline materials PbF.sub.2, Cu.sub.2 O, and CdO, in addition to a glass of, by weight, 45-52% PbO, 3-6% B.sub.2 O.sub.3, 30-35% SiO.sub.2, 4-6% TiO.sub.2, 2-4% ZrO.sub.2, 0-1% ZnO, 1-4% Na.sub.2 O, 0-4% CdO, and 0-2% Li.sub.2 O.

Gold conductor compositions

This invention relates to dispersions of gold and a certain inorganic binder in an inert liquid vehicle, useful in the electronics art for producing conductor patterns adherent to substrates. Small amounts of the binder are effective in producing excellent adhesion to substrates, such as ceramic substrates. The binders comprise certain amounts of the crystalline materials, PbF.sub.2, Cu.sub.2 O, and CdO, in addition to a glass of, by weight, 45-52% PbO, 3-6% B.sub.2 O.sub.3, 30-35% SiO.sub.2, 4-6% TiO.sub.2, 2-4% ZrO.sub.2, 0-1% ZnO, 1-4% Na.sub.2 O, 0-4% CdO, and 0-2% Li.sub.2 O.

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Hockessin, DE, United States of America

Lewis Charles Hoffman