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Title: Graphite having improved thermal stress resistance and method of preparation

Abstract

An improved method for fabricating a graphite article comprises the steps of impregnating a coke article by first heating the coke article in contact with a thermoplastic pitch at a temperature within the range of 250.degree.-300.degree. C. at a pressure within the range of 200-2000 psig for at least 4-10 hours and then heating said article at a temperature within the range of 450.degree.-485.degree. C. at a pressure of 200-2000 psig for about 16-24 hours to provide an impregnated article; heating the impregnated article for sufficient time to carbonize the impregnant to provide a second coke article, and graphitizing the second coke article. A graphite having improved thermal stress resistance results when the coke to be impregnated contains 1-3 wt.% sulfur and no added puffing inhibitors. An additional improvement in thermal stress resistance is achieved when the second coke article is heated above about 1400.degree. C. at a rate of at least 10.degree. C./minute to a temperature above the puffing temperature.

Inventors:
 [1]
  1. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
863514
Patent Number(s):
4190637
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
graphite; improved; thermal; stress; resistance; method; preparation; fabricating; article; comprises; steps; impregnating; coke; heating; contact; thermoplastic; pitch; temperature; range; 250; degree; -300; pressure; 200-2000; psig; 4-10; hours; 450; -485; 16-24; provide; impregnated; sufficient; time; carbonize; impregnant; graphitizing; results; contains; 1-3; wt; sulfur; added; puffing; inhibitors; additional; improvement; achieved; heated; 1400; rate; 10; minute; article comprises; coke article; improved thermal; thermal stress; improved method; sufficient time; /423/264/

Citation Formats

Kennedy, Charles R. Graphite having improved thermal stress resistance and method of preparation. United States: N. p., 1980. Web.
Kennedy, Charles R. Graphite having improved thermal stress resistance and method of preparation. United States.
Kennedy, Charles R. Tue . "Graphite having improved thermal stress resistance and method of preparation". United States. https://www.osti.gov/servlets/purl/863514.
@article{osti_863514,
title = {Graphite having improved thermal stress resistance and method of preparation},
author = {Kennedy, Charles R.},
abstractNote = {An improved method for fabricating a graphite article comprises the steps of impregnating a coke article by first heating the coke article in contact with a thermoplastic pitch at a temperature within the range of 250.degree.-300.degree. C. at a pressure within the range of 200-2000 psig for at least 4-10 hours and then heating said article at a temperature within the range of 450.degree.-485.degree. C. at a pressure of 200-2000 psig for about 16-24 hours to provide an impregnated article; heating the impregnated article for sufficient time to carbonize the impregnant to provide a second coke article, and graphitizing the second coke article. A graphite having improved thermal stress resistance results when the coke to be impregnated contains 1-3 wt.% sulfur and no added puffing inhibitors. An additional improvement in thermal stress resistance is achieved when the second coke article is heated above about 1400.degree. C. at a rate of at least 10.degree. C./minute to a temperature above the puffing temperature.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {1}
}

Patent:

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