Figure 14
Microstructure orientation (a), d-spacing (b) and crystal sizes (c, d) plotted as a function of temperature from direct resistive heating of Toray T300 PAN (red triangles), Thornel P25 pitch (black squares) and Hexcel IM-7 PAN (green circles) carbon fibre bundles. A nominal 20 MPa stress was applied to all fibres during heating. |