Magnetic Orientation Study of Matrix Mesophase of Unidirectional C/C Composities in a Magnetic Field

SEM, X-ray Diffraction and Reflected Polarized Micrography using crossed polarizers were employed to investigate the orientation of unidirectional C/C composites' matris mesophase pitch in 0.8T magnetic field and verified that the mesophase layers of the C/C composites were parallel to magnetic field's direction. It was found that the mesophase layers of the C/C composites in the magnetic field were perpendicular to the carbon fibers.