Carbon resistor and method for producing same

Details Carbon resistor and method for producing same Carbon resistor and method for producing same

1982-11-08

1985-04-16

Parrish, John A.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 63, H01C 1300

Patent

active

045115249

ABSTRACT:
A carbon resistor and a method for producing the resistor are disclosed. The method preferably comprises the steps of preparing a uniform, finely-divided mixture by blending a glass frit with at least one temporary binder and substantially 1/4 to 4 percent of conductive carbon, pressing a longitudinally extending shape having opposed ends from the mixture, heating the shape to 450-550 degrees F. for about 30 minutes and cooling to ambient temperature, applying a silver paint containing a lead borosilicate frit composition to the cooled shape to provide electrical contacts, and firing the shape and contacts to vitrify the frit of the resistor. A preferred lead borosilicate frit composition, by weight, consists essentially of from 5 to 15 percent of AlPO.sub.4, from 1/4 to 3 percent of conductive carbon, from 15 to 30 percent of a phenyl lower alkyl silicone resin and from 65 to 80 percent of a lead borosilicate glass frit which consists essentially of substantially 20 percent SiO.sub.2, 15 percent B.sub.2 O.sub.3, 59 percent PbO and 6 percent Na.sub.2 O.

REFERENCES:
patent: 2459282 (1949-01-01), McDougal et al.
patent: 2526059 (1950-10-01), Zabel et al.
patent: 2536962 (1951-01-01), Sorg
patent: 2831138 (1958-04-01), Teasel
patent: 3173056 (1965-03-01), Dressel
patent: 3382574 (1968-05-01), Chadwick
patent: 3742423 (1973-06-01), Chadwick
patent: 3909459 (1975-09-01), Hermann et al.
patent: 4030004 (1977-06-01), Rutt
patent: 4051074 (1977-09-01), Asada

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