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The influence of an oxidation inhibitor on the elevated temperature fracture resistance of carbon/carbon composites

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Abstract

This fracture study evaluates the role of a fiber/matrix interfacial glass on the toughening of two different carbon/carbon (C/C) composites. Both composites incorporate a two-dimensional layup of 8-harness satin weave continuous fiber fabric, but differ in several aspects, the most significant of which is the presence of an oxidation inhibitor in one of these. The fracture behavior of both materials was determined in three-point flexure at 20 through 1650 °C. Microstructural studies indicate that the nonhomogeneous distribution of the oxidation inhibitor within the fiber bundles controls the fracture behavior. Electron microprobe results indicate a high concentration of the glass oxidation inhibitor associated with the inter-bundle matrix, while the intra-bundle matrix is composed primarily of carbon. Accordingly, debonding along the inter-bundle interfaces characterizes the oxidation inhibited composite, whereas the nonoxidation inhibited samples debond by individual fibers. Both materials exhibit strongly rising R-curves throughout the test temperature range. At the higher test temperatures the oxidation inhibited C/C shows the greatest cumulative toughening component, although at a lower value of the fracture toughness. This is consistent with the observed increase in the percentage of fibers that experience individual pullout at the higher temperatures.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Houston, 77204-4792, Houston, Texas, USA

    Arthur J. Lucchesi, Jack C. Hay & Kenneth W. White

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  1. Arthur J. Lucchesi
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  2. Jack C. Hay
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  3. Kenneth W. White
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Lucchesi, A.J., Hay, J.C. & White, K.W. The influence of an oxidation inhibitor on the elevated temperature fracture resistance of carbon/carbon composites. Journal of Materials Research 7, 1795–1804 (1992). https://doi.org/10.1557/JMR.1992.1795

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  • DOI: https://doi.org/10.1557/JMR.1992.1795

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