Abstract:The key techniques for determining orientation angle (OA) and interlayer space (d002) of pyrocarbon were investigated by analyzing selected area electron diffraction (SAED) patterns. A series of algorithms, which mainly include the five-point center-determined technique, the integral factor for the ellipse detection, the background subtraction operation and the Gaussian multipeak fitting algorithm, were designed for intensity sampling, data correction, and data fitting. The contribution ratio of the reflection… Show more
“…TEM images clearly showed that the surface of the C f was covered with a thin and uniform interfacial layer with a thickness of about ∼150 nm (Figure 4(a)). From the SAED pattern and based on the procedures preparation by our research group [24], orientation angle (OA) value of 88° could be obtained, which demonstrated that PyC in our samples would be considered low texture [25]. Figure 4 (a) TEM image of the fibres coated with PyC, (b) the corresponding SAED diffraction pattern, and (c) OA value.…”
The microstructure of high strength PAN-based T700 carbon fibre (C f ) with pyrolytic carbon (PyC) coating was characterised. Effects of PyC coating on the surface of carbon fibres, interface characteristics, and mechanical properties of C f /AZ91D composites were evaluated. The results showed that the carbon fibres with PyC coating had higher surface roughness and higher graphitisation which were beneficial to ease hazardous interface reaction. C f -PyC/ AZ91D composites with an optimal PyC coating that is about 150 nm thick and has low texture exhibited ultimate tensile strength of 416 MPa, which demonstrated 35% improvement compared with the C f /AZ91D composites. The increase of mechanical properties of C f -PyC/AZ91D composites could be ascribed to a synergistic effect of the rough C f surface interlocking, an optimum interfacial bonding between fibres and matrix, and protection of fibres from a corrosive attack of the aluminium element in the matrix.
“…TEM images clearly showed that the surface of the C f was covered with a thin and uniform interfacial layer with a thickness of about ∼150 nm (Figure 4(a)). From the SAED pattern and based on the procedures preparation by our research group [24], orientation angle (OA) value of 88° could be obtained, which demonstrated that PyC in our samples would be considered low texture [25]. Figure 4 (a) TEM image of the fibres coated with PyC, (b) the corresponding SAED diffraction pattern, and (c) OA value.…”
The microstructure of high strength PAN-based T700 carbon fibre (C f ) with pyrolytic carbon (PyC) coating was characterised. Effects of PyC coating on the surface of carbon fibres, interface characteristics, and mechanical properties of C f /AZ91D composites were evaluated. The results showed that the carbon fibres with PyC coating had higher surface roughness and higher graphitisation which were beneficial to ease hazardous interface reaction. C f -PyC/ AZ91D composites with an optimal PyC coating that is about 150 nm thick and has low texture exhibited ultimate tensile strength of 416 MPa, which demonstrated 35% improvement compared with the C f /AZ91D composites. The increase of mechanical properties of C f -PyC/AZ91D composites could be ascribed to a synergistic effect of the rough C f surface interlocking, an optimum interfacial bonding between fibres and matrix, and protection of fibres from a corrosive attack of the aluminium element in the matrix.
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