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Graphite having improved thermal stress resistance and method of preparation

Patent ·
OSTI ID:863514
 [1]
  1. Oak Ridge, TN
+ Show Author Affiliations
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.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
DOE Contract Number:
W-7405-ENG-26
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Number(s):
US 4190637
OSTI ID:
863514
Country of Publication:
United States
Language:
English

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