Protective effect of thin alumina layer on carbon fibre to preserve tensile strength during CNT growth by CVD

Citation
16th European Conference on Composite Materials, ECCM 2014: (2014)
Contribution to Conference
16th European Conference on Composite Materials, ECCM 2014  
Scopus ID
2-s2.0-84915748135
As received AS4 carbon fibres were covered with a thin alumina layer by atomic layer deposition prior to the growth of radially aligned carbon nano tubes onto the fibre surface. The deposition of alumina was found to preserve the initial fibre tensile strength in the harsh conditions during carbon nanotube growth by chemical vapour deposition. The fibre tensile strength was measured by single fibre tensile test for fibres treated with different processing parameters. The interphase properties between carbon fibre, alumina layer and matrix material were characterized by carrying out single fibre fragmentation tests. The length of the ongrown carbon nano tubes can exceed 7 μm, i.e. the carbon fibre diameter. Experiments prove that the deposited alumina layer with a thickness of as little as 12.8 nm preserves the fibres initial tensile strength.
Subjects
Chemical vapour deposition
Fibre tensile strength
Hierarchical composites
Multi scale composites
DDC Class
600: Technik