An Investigation of Some of the Causes for the Spalling of Impregnated Graphite

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The impregnation process of the graphite used for investigations of spalling is described. Polished graphite specimens were examined at room temperature using bright field metallographic techniques. The gas evolution characteristics of impregnated graphite were also determined. Results indicated that the amount of impregnant introduced during the fourth impregnation cycle could be a critical factor in causing spalls in the manufacturing process. The permeability of the impregnated graphite was found to increase with the temperature to which the impregnated graphite was heated. Studies showed that the most significant changes in the impregnant and in the gas evolution occurred in the temperature … continued below

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Kosiba, W. L.; Tully, G. R., Jr. & Turovlin, B. June 19, 1961.

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The impregnation process of the graphite used for investigations of spalling is described. Polished graphite specimens were examined at room temperature using bright field metallographic techniques. The gas evolution characteristics of impregnated graphite were also determined. Results indicated that the amount of impregnant introduced during the fourth impregnation cycle could be a critical factor in causing spalls in the manufacturing process. The permeability of the impregnated graphite was found to increase with the temperature to which the impregnated graphite was heated. Studies showed that the most significant changes in the impregnant and in the gas evolution occurred in the temperature range of 100 to 600 deg C. These results suggested that a slower heating rate during carbonization is likely to reduce spalling. A tentative mechanism for spalling is offered. (M.C.G.)

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Other Information: Orig. Receipt Date: 31-DEC-61

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  • June 19, 1961

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  • Jan. 22, 2018, 7:23 a.m.

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  • Nov. 21, 2024, 1:42 a.m.

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Kosiba, W. L.; Tully, G. R., Jr. & Turovlin, B. An Investigation of Some of the Causes for the Spalling of Impregnated Graphite, report, June 19, 1961; San Diego, California. (https://digital.library.unt.edu/ark:/67531/metadc1052169/: accessed December 13, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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