Graphite having improved thermal stress resistance and method of

Details Graphite having improved thermal stress resistance and method of Graphite having improved thermal stress resistance and method of

1978-07-18

1980-02-26

Meros, Edward J.

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

264 295, C01B 3104

Patent

active

041906373

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.

REFERENCES:
patent: 3517092 (1970-06-01), Peterson
patent: 3563705 (1971-02-01), Grindstaff et al.
patent: 3957957 (1976-05-01), Newman et al.
patent: 4091196 (1978-05-01), Smith et al.
Chard et al., "Graphite Processing Technology" ACS Symposium Serials, No. 21, Chapter 14, 1974, pp. 155-171.
Paluzelle et al., "The Development and Fabrication of Carbon Composites, Special Graphite, and Precursor Materials," AFML-TR-127, Jan. 5, 1977, pp. 1-24.
Whittaker et al., Carbon, vol. 7, pp. 615-621, 1969.
Fitzer et al., 11th Biennial Conference on Carbon (1973), pp. 67-68.
Fitzer et al., 12th Biennial Conference on Carbon (1975), pp. 243-244.
Kennedy, "The Use of Sulfur to Control Physical Properties in Graphite", 13th Biennial Conf. on Carbon, Jul. 18-22, 1977.
Tucker et al., "Puffing of Electrode Stock as Influenced by Sulfur Content and Heating Rate", 13th Biennial Conference on Carbon, Jul. 18-22, 1977.
12th Biennial Conference on Carbon Extended Abstracts and Program, Jul. 28-Aug. 1, 1975, pp. 241-242, 255-256, 305-306.

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