Study of machining Ti alloy for airplanes with high efficiency by using boron containing thin films with lubricious properties at high temperatures

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The Ti alloys are difficult-to-machine materials because the temperatures rise easily at the tool edge due to their small thermal conductivity. In this work, we attempt to improve the cutting efficiency of the Ti alloys by coating on the tool edge surface with hard and lubricious thin film.We focused on TiB2+a thin film as the coating material in which boron was contained excessively compared to TiB2 thin film. We succeed to obtain the TiB3.3 thin film with the hardness of 35GPa. Then, these films showed the high critical loads in the scratch tests.Then, we created the TiB3.3 coated tools, and evaluate the cutting efficiency of the Ti alloys by using the high speed precision lathe. The Ti-B-C coated tool showed better efficiency of cutting than non coated tool. However, the TiB3.3 thin film was peeled off at the tool edge surface at the cutting length of 1000 m.