Fiber-matrix interphase development in carbon/carbon/composites
- Aerospace Corporation, El Segundo, CA (United States)
In carbon/carbon (C/C) composites-i.e., a composite in which a carbon matrix is reinforced with carbon fiber-it is found that when the matrix is derived from a thermosetting resin, we always observe a distinct, highly graphitizable and well-oriented matrix interphase structure adjacent to the fibers. Qualitatively, the orientation of the interphase is the same as the fiber. It is important to note that thermosetting resins are nongraphitizing when heated in bulk; they form isotropic, amorphous {open_quotes}glassy{close_quotes} carbon. The structure of this interphase becomes more prominent, i.e., more graphitic, as the heat treatment exceeds about 2200{degrees}C. We have postulated that the basis for this graphite interphase development is molecular orientation induced in the degradation of the polymer matrix to carbon as a consequence of restraint of pyrolysis shrinkage at the fiber-matrix interface. More specifically, we have hypothesized that the critical factor for development of lamellar graphite (by subsequent high-temperature heat treatment) in this interphase, rather than amorphous glassy carbon, is a state of multiaxial tensile deformation during pyrolysis.
- OSTI ID:
- 96585
- Report Number(s):
- CONF-940416-; TRN: 95:005316-0067
- Resource Relation:
- Conference: 96. annual meeting of the American Ceramic Society (ACS), Indianapolis, IN (United States), 25-28 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of Ceramic transactions: Advances in ceramic-matrix composites II. Volume 46; Singh, J.P.; Bansal, N.P. [eds.]; PB: 1065 p.
- Country of Publication:
- United States
- Language:
- English
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