Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Resistor Compositions

IP.com Disclosure Number: IPCOM000095497D
Original Publication Date: 1964-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Block, ML: AUTHOR [+2]

Abstract

This resistor composition employs combinations of metal oxides to realize resistivities in the order of one kilohm to greater than 100 kilohms per square. Various oxides of Group 2B metals and oxides of Group 5A elements can be combined to realize the resistivities previously indicated. Copper oxide (CuO) can be also included with the 2B group. The composition can be silk screened on a ceramic substrate without the use of a glass flux for adhesion purposes.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Resistor Compositions

This resistor composition employs combinations of metal oxides to realize resistivities in the order of one kilohm to greater than 100 kilohms per square. Various oxides of Group 2B metals and oxides of Group 5A elements can be combined to realize the resistivities previously indicated. Copper oxide (CuO) can be also included with the 2B group. The composition can be silk screened on a ceramic substrate without the use of a glass flux for adhesion purposes.

In one composition, 0. 01 to 0. 075 mols of bismuth as bismuth trioxide together with one mol of cadmium as cadmium oxide are thoroughly mixed prior to preparation as a paste. An organic vehicle, typically B-terpineol, is added such that the solid material is 75% and the organic vehicle is 25% of the final composition. The composition as a paste is screened or otherwise suitably deposited on an alumina substrate.

The deposited composition is fired in a temperature range of 750-950 degrees C depending upon the oxides employed in the combination. The time interval of firing is of the order of 10-60 minutes depending upon the oxide system. The final resistors have temperature coefficients of resistivity TCR which can be made to vary by varying composition or oxide ratios.

The resistivity and TCR compare favorably with metal-glaze compositions presently available. Metal-glaze compositions require noble metals and glass to realize good resistors. This composition eliminates these requirements....