Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
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.
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Kowalski Charles I.
Nemeth Joseph
Champion Spark Plug Company
Parrish John A.
Purdue John C.
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