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:
-
- Oak Ridge, TN
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- OSTI Identifier:
- 863514
- Patent Number(s):
- US 4190637
- Assignee:
- United States of America as represented by United States (Washington, DC)
- 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. 1980.
"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 = {},
url = {https://www.osti.gov/biblio/863514},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1980},
month = {Tue Jan 01 00:00:00 EST 1980}
}