Abstract
The poor wear resistance of carbon fibre reinforced polymers (CFRP) causes severe problems if the material is subjected to solid particle erosion. To overcome this problem, erosion resistant magnetron sputtered PVD coatings were deposited on CFRP substrates. Different 30µm thick metallic (Ti, Al, Cr) and multilayer (Ti/TiN) coatings were analysed in order to investigate the influence of the coating hardness and microstructure regarding the erosion performance. Erosion testing was performed at 90° and 20° using a particle speed of 65m/s. Selected samples were also tested at 90° and 94m/s to study the influence of the higher particle velocities. The results indicate that the erosion process of PVD coatings on CFRP can be divided into coating and substrate driven erosion mechanisms. Those two stages of coating failure should be considered for an optimal coating design. Ductile titanium coatings can improve the erosion resistance of CFRP at 90° while hard Ti/TiN (1:10) multilayers should be used if erosion at shallow angles occur. For applications where erosion at mixed angles may be present a Ti/TiN (1:1) system reveals promising erosion behaviour. When the particle velocity is increased, the protective function of a 30µm titanium coating at 90° decreases because both coating and substrate driven erosion enhance the material loss.
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