Development of super hard Ti-B-C coated tool with high thermal stability for dry cutting.

本工作通过控制硼和碳的含量来提高Ti-B-C薄膜的硬度和摩擦性能。用TiB_2+10wt%B靶制备的TiB_（2+α）薄膜具有35 GPa以上的高硬度。碳含量大于40%的Ti-B-C薄膜的摩擦系数约为0.2。在切削钛合金时，Ti-B-C涂层刀具改善了刀尖成形工艺，使工件表面粗糙度变得光滑。

In this work, the hardness and the frictional properties of Ti-B-C films have been improved by controlling the contents of boron and carbon. TiB_<2+α> films obtained with TiB_2+10wt%B target had the high hardness above 35GPa. The friction coefficients of Ti-B-C films with the carbon content above 40% were about 0.2. In the cutting Ti alloys, tip formation process had been improved and the surface roughness of the work piece became smooth by using the Ti-B-C coated tools.