Structural development of PAN-based carbon fibers studied by in situ X-ray scattering at high temperatures under load

Autor(en)

Harald Rennhofer, Dieter Loidl, Stephan Puchegger, Herwig Peterlik

Abstrakt

PAN-based carbon fiber bundles were simultaneously loaded and heated in an X-ray transparent testing device, which made it possible to follow the structural development in situ. The stress-strain curves are recorded together with structural parameters such as the inter-layer spacing, the crystallite size L-c and the orientation of the graphene planes, obtained from the scattering intensity of the d(002)-reflection. Simultaneously, the size and orientation of pores were determined from small-angle X-ray scattering. Experiments were performed at temperatures up to 1700 degrees C and stresses up to 260 MPa. It was observed that the main part of the structural change occurs in the short time period of heating the fibers up to high temperatures. An increased orientation and growth of crystallites take place as a consequence of combined mechanical forces and high temperatures. This is followed by an additional but only smaller amount of structural change with time, which is due to dislocation movement, dislocation annealing and gliding of graphene planes.

Organisation(en)

Dynamik Kondensierter Systeme

Externe Organisation(en)

Universität für Bodenkultur Wien

Journal

Carbon

Band

48

Seiten

964-971

Anzahl der Seiten

8

ISSN

0008-6223

DOI

https://doi.org/10.1016/j.carbon.2009.11.012

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/structural-development-of-panbased-carbon-fibers-studied-by-in-situ-xray-scattering-at-high-temperatures-under-load(0f90214f-2171-4ae9-b3ae-b62659fa5496).html