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The effect of Graphitization on the Mechanical Properties of twodimensional carbon – carbon composites
Author(s) -
Sedghi A.,
Fard F. Golestani
Publication year - 1997
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19970280510
Subject(s) - materials science , composite material , composite number , carbon fibers , thermal , bending , microstructure , matrix (chemical analysis) , flexural strength , physics , meteorology
In this article the effect of graphitization in twodimensional c‐c composite bodies prepared by impregnation of novalak resin is reported. Mechanical properties were determined by bending tests and microstructural features were studied by SEM and XRD. It was found that primary graphitization at 2300°C followed by graphitization at 2500°C improves the mechanical strength remarkably. Repeated graphitization and long – term treatment at 2500°C, however, found to have an adverse effect. Microstructural observations revealed that the level of strength is mainly controlled by a sheath developed around the fibre during graphitization. Applying an improper thermal regime affects the matrix – fibre adherence and may cause the destruction of the fibres. This enhances the crack propagation and causes early failure of composite body under loading.