Article ID Journal Published Year Pages File Type
1577962 Materials Science and Engineering: A 2011 6 Pages PDF
Abstract

Carbon/carbon (C/C) composites with multiple matrixes were fabricated by impregnation/carbonization and chemical vapor infiltration (CVI) using 2-dimensional (2D) carbon felts preform. In order to study the effects of microstructure on mechanical properties, C/C composites with single matrix of pitch based carbon were prepared for comparison. The mechanical properties were tested on CMT5304-30KN universal testing machine. Polarization microscope and scanning electron microscope were used to investigate the microstructures and fracture surface of C/C composites. It was resulted that the flexural strength of C/C composites with multiple matrixes was improved by 83% compared with that of C/C composites with single matrix. Meanwhile, better toughness and pseudo-plastic fracture behaviors were also obtained with multiple matrixes. Multi-layer interfaces between different constituents were formed in the composites which supplied variety of extension paths for cracks. This microstructure character improved the mechanical properties of C/C composites, especially the toughness, as more energy could be dissipated during cracks spread along multiple paths, such as the interface of different components or among the matrixes.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Carbon/carbon (C/C) composites. ► C/C composites with multiple matrixes present mixed microstructures. ► C/C composites with multiple matrixes exhibit super mechanical properties. ► Cracks may spread along multiple paths such as interface of different constituents. ► Multi-path for extension of crack improves mechanical properties of C/C composites.

Related Topics
Physical Sciences and Engineering Materials Science Materials Science (General)
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