Stock material or miscellaneous articles – Structurally defined web or sheet – Including grain – strips – or filamentary elements in...
Patent
1997-11-26
2000-05-09
Weisberger, Richard
Stock material or miscellaneous articles
Structurally defined web or sheet
Including grain, strips, or filamentary elements in...
428114, 428334, 428335, 428413, 428414, 428408, H01B 106
Patent
active
060601477
ABSTRACT:
The present invention relates to a carbon fiber-reinforced composite material having a high toughness against delamination, which is prepared by regulating the rate of cure reaction of a thermosetting resin used as a matrix and the rate of dissolving a toughening agent in the matrix to form a morphology gradient depending on a concentration gradient of the toughening agent between layers of the carbon composite material. A process for preparing the carbon fiber-reinforced composite material which comprises the steps of: obtaining a thermosetting resin in a melted or solution form, and adding a catalyst of the thermosetting resin to obtain a prepreg; adding a toughening agent between plies within the prepreg thus impregnated, in a form of film having a uniform thickness or in a form of powder having a uniform distribution; and, curing under a proper reaction temperature and pressure, by autoclave vacuum bag molding method or compression molding method. The carbon fiber-reinforced composite material of the invention has a higher toughness against delamination than the conventional ones, and still has a thermostability and a chemical resistance to solvent or acid which is one of advantages of a thermosetting matrix, while improving a weight penalty phenomenon which is a disadvantage of a conventional interleaved system.
REFERENCES:
patent: 4604319 (1986-08-01), Evans et al.
patent: 5132052 (1992-07-01), Cobbledick et al.
S. Zeng et al. (1986) Particulate Interlayer Toughening of Dicyanate Matrix Composites, Polymer Composites, 114:458-466 (1993).
Kim Sung-Chul
Kim Yu-Seung
Korea Advanced Institute of Science and Technology
Weisberger Richard
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