Carbon electrodes having a low coefficient of thermal expansion

Details Carbon electrodes having a low coefficient of thermal expansion Carbon electrodes having a low coefficient of thermal expansion

1980-12-24

1982-09-21

Envall, Jr., Roy N.

Industrial electric heating furnaces

Arc furnace device

Electrode

H05B 7085

Patent

active

043510566

ABSTRACT:
This invention is directed toward an improved carbon electrode having a coefficient of thermal expansion of less than 3.5.times.10.sup.-7. Composition of the electrode includes needle coke in an amount of from about 60 to 90 weight percent and a quinoline soluble binder pitch in an amount of from about 10 to 40 weight percent, having a ring and ball softening point of from about 94.degree. to 150.degree. C. consisting of a highly aromatic condensation product of a distilled cycle oil extract with an extractant selected from the group consisting of furfural, phenol, B,B'-dichloro diethyl ether, nitrobenzene and sulfur dioxide.

REFERENCES:
patent: 2775549 (1956-12-01), Shea, Jr.
patent: 3265093 (1966-08-01), Wisniewski et al.
patent: 3350295 (1967-10-01), Hamner et al.

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