Nanoengineering of fibre surface for carbon fibre-carbon nanotube hierarchical composites

Conference paper (2019)

Authors

Wojciech Szmyt University of Applied Sciences and Arts Northwestern Switzerland
Michel Calame Swiss Federal Laboratories for Materials Science and Technology (Empa)
Celestino Padeste Paul Scherrer Institut
C.A. Dransfeld Aerospace Manufacturing Technologies - Aerospace Engineering
Research Group
Aerospace Manufacturing Technologies (Aerospace Engineering) (TU Delft)
Copyright: © 2019 Wojciech Szmyt, Michel Calame, Celestino Padeste, C.A. Dransfeld
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Published Date

2019

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Aerospace Manufacturing Technologies

Abstract

We aim to enhance the carbon fibre (CF)-matrix interface by synthesizing carbon nanotubes (CNTs) on the surface of the CF, creating a hierarchical composite. A 12 nm thick aluminium oxide film applied by atomic layer deposition (ALD) provides protection of the CF from deterioration during CNT growth in a chemical vapour deposition (CVD) process. However, the adhesion of alumina to CF, grown in classical water/trimethylaluminium ALD is severely diminishing during CNT growth, as detected by interface shear strength (IFSS) measurements. In our approach to improve the CF-alumina adhesion, we employed a pre-treatment of the CF with ozone and entirely replaced water with ozone in the ALD process, to promote the covalent bonding of the alumina to the CF surface. The current results show a new perspective in achieving the CNT synthesis on the CF while successfully mitigating its detrimental effects on the fibre mechanical properties.