Development of nano-diamond coated tools and their cutting performance in drilling CFRP

Jianguo Zhang, Bin Shen, Fanghong Sun


AbstractNano-diamond coated drilling tools are fabricated using WC-Co cemented carbide drills as substrates by the hot filament chemical vapor deposition (HFCVD) technique. The nano-diamond coating is deposited by straight hot filaments fixed in parallel manner around the WC-Co tools, with gases of acetone, hydrogen and argon used as reactant sources. The as-grown films are characterized by SEM and Raman spectroscopy. The results show that nano-diamond films with good quality are uniformly deposited on the surface of drilling tool. Cutting performance of as-fabricated CVD nano-diamond coated tool is studied in drilling carbon fiber reinforced plastics (CFRP) material, which is comparing with the micro-diamond coated and uncoated WC-Co drills. The results indicate that the diamond coated tools have great advantages in cutting the difficult-to-machine materials compared to the uncoated tool, due to the excellent properties of diamond films. The nano-diamond coated drill shows better resistance than the micro-diamond coated one for its smoother surface, which brings the sharper cutting edges.

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