Air-fireable thick film inks
AssigneeRCA Corporation
InventorsAshok N. Prabhu, Kenneth W. Hang
Life of this patent
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Abstract
Improved air-fireable resistor and conductor inks useful in constructing multilayer integrated circuits on porcelain-coated metal substrates are provided. The subject inks comprise a barium calcium borosilicate glass frit, a suitable organic vehicle, and a functional component, i.e., ruthenium dioxide, in the resistor inks and one or more precious metals plus bismuth oxide in the conductor inks.
Claims24
In an air-fireable conductor or resistor ink suitable for forming a film on a porcelain-coated metal circuit board comprising from about 2 to about 90 percent by weight of a functional component, from about 1 to about 80 percent by weight of a glass frit and from about 8 to about 35 percent by weight of a suitable organic vehicle, wherein the functional component in the resistor ink is ruthenium dioxide and the functional component in the conductor ink is a precious metal in combination with bismuth oxide, wherein bismuth oxide is present in admixture with the precious metal or as a component of the glass;
- the improvement wherein the glass frit consists of from about 40 to about 55 percent by weight of barium oxide, from about 10 to about 15 percent by weight of calcium oxide, from about 14 to about 25 percent by weight of boron trioxide, and from about 13 to about 23 percent by weight of silicon dioxide.
In an assembly comprising a porcelain-coated metal circuit board having on a portion of the surface thereof a coating of an air-fireable conductor or resistor ink comprising from about 2 to about 90 percent by weight of a functional component, from about 1 to about 80 percent by weight of a glass frit and from about 8 to about 35 percent by weight of a suitable organic vehicle, wherein the functional component in the resistor ink is ruthenium dioxide and the functional component in the conductor ink is a precious metal in combination with bismuth oxide, wherein bismuth oxide is present in admixture with the precious metal or as a component of the glass,
- the improvement wherein the glass frit consists of from about 40 to about 55 percent by weight of barium oxide, from about 10 to about 15 percent by weight of calcium oxide, from about 14 to about 25 percent by weight of boron trioxide, and from about 13 to about 23 percent by weight of silicon dioxide.
In an electronic assembly comprising a porcelain-coated metal circuit board having a circuit thereon, said circuit containing a resistor film or conductor film formed by applying and firing in air a resistor or conductor ink comprising from about 2 to about 90 percent by weight of a functional component, from about 1 to about 80 percent by weight of a glass frit and from about 8 to about 35 percent by weight of a suitable organic vehicle, wherein the functional component in the resistor ink is ruthenium dioxide and the functional component in the conductor ink is a precious metal in combination with bismuth oxide, wherein bismuth oxide is present in admixture with the precious metal or as a component of the glass,
- the improvement wherein said glass frit consists of from about 40 to about 55 percent by weight of barium oxide, from about 10 to about 15 percent by weight of calcium oxide, from about 14 to about 25 percent by weight of boron trioxide, and from about 13 to about 23 percent by weight of silicon dioxide.
Dependencies are inferred from the claim text.