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US 4,998,709 AGranted
Method of making graphite electrode nipple
AssigneeConoco Inc.
InventorsRobert R. Griffin, Keith M. Roussel, Ta-Wei Fu
Life of this patent
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Abstract
The present invention resides in improved graphite nipples which are suitable for connecting graphite electrodes. The graphite nipples are prepared by adding mesophase pitch-based carbon fibers into a typical nipple extrusion blend.
Claims6
A process for producing graphite nipples suitable for connecting graphite electrodes which comprises the steps of:
- (a) adding from about 8 weight percent to about 20 weight percent of carbon fibers produced from spun mesophase pitch to from about 45 weight percent to about 65 weight percent of premium coke and from about 22 weight percent to about 28 weight percent of a binder to form an extrusion blend,
- (b) extruding the extrusion blend to form an elongated carbon nipple,
- (c) subjecting the carbon nipple to a temperature of from about 760.degree. C. to about 982.degree. C. for from about 2 weeks to about 5 weeks to produce a baked carbon nipple;
- and
- (d) subjecting the baked carbon nipple to a temperature above about 2,704.degree. C. from about 5 days to about 14 days to produce a graphite nipple.
2 more elements
Dependencies are inferred from the claim text.