Abstract
Abstract A synchrotron radiation source has been used to monitor the x-ray diffraction patterns of a series of experimental PAN-based carbon fibers. The use of the synchrotron made feasible the collection of a substantial quantity of data on a reasonable time scale, by reducing the required exposure times by more than three orders of magnitude. The fibers considered in this report were hot stretched at temperatures in the range 2700°C to 3000°C for 5 minutes with stretching stresses between 5 MPa and 85 MPa. Measurement of the azimuthal and radial widths of the (00.2) reflections led to evaluation of figures for the preferred orientation parameter, Z, and the “apparent” crystallite size perpendicular to the graphitic rafts, Lc. The results showed that large increases in texturing can be achieved by hot stretching, so that from a starting value of ~38°, Z was reduced to between ~19° (2700°C and 5 MPa) and ~10° (3000°C and 85 MPa). Measurement of Lc was not possible for the as-received libers, since reflect...
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