Abstract
The solid particle erosion resistance of CVD diamond coated T1-6A1-4V samples has been investigated in comparison with PVD hard coatings. In particular, diamond films grown with 4% methane gas concentration show excellent erosion resistance under both a 30 ° and a 90 ° incidence angle. Diamond coatings deposited applying 1% methane possess a somewhat lower particle impact resistance. The PVD coatings show almost no positive effect on the erosion behaviour of Ti-6A1-4V. Different failure mechanisms of diamond films grown with 1 and 4% methane gas concentration were identified: for the first an intercrystalline and for the latter a transgranular crack propagation was observed. This indicates relatively weak crystal boundaries for the diamond coatings grown with 1% methane concentration. Additional evidence for lower boundary strength was found when applying Rockwell C indents onto the films.
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