Grit Blasting of Carbon Fibre and Aluminium Oxide Joints

Grit blasting is a surface preparation technique involving abrasive media. It has been used for all kinds of engineering components, such as medical devices, aerospace components and automotive parts.

Grit-blasting has been investigated as a pretreatment for carbon-fibre thermoplastic composite to aluminium bonded joints. The aim of this study was to investigate the influence of the grit-blasting process on adhesion and durability. The effects of different grit-blasting parameters and time were examined. The results indicate that the time of grit-blasting is not a significant factor in the joint bonding. However, the durability can be improved by optimisation of the grit-blasting process.

The results indicate that increased grit-blasting time increases the carbon content. This is a consequence of the increased carbon fibre exposure on the surface. This could be due to the increased oxidisation of various carbon species.

The peak value of the O1s spectrum for the T0 specimen is 531.2 eV. This is close to the Si-O binding energy. The O1s content decreases as the grit-blasting time increases. This suggests that the T20 specimens have the highest polar group content.

The work-to-failure (WF) of the T20 joints is lower than that of the T40. The weak interfacial layer is a result of the grit-blasting process. This contributes to the failure mode of dense fibre-tearing.

The fibre-tearing area of the DY_T20 specimens is 39% smaller than that of the DY_T40. This result suggests that the weak interfacial layer contributes to the weak boundary layer.

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