| abstract |
CVD coated cutting tools are provided. A coated cutting tool described herein, in some embodiments, comprises a PcBN substrate and a polished coating adhered to the substrate including one or more layers of Al 2 O 3 deposited by chemical vapor deposition, wherein the coating has a surface roughness (R a ) less than about 600 nm in an area of the cutting tool for contacting a workpiece. |