a multi - layer cvd coating has at least one coating layer made of a metallic hard material layer x having a thickness of 10 to 90 nm , and at least one additional coating layer made of a metallic hard material layer y doped with boron , having a boron content of 0 . 005 to 5 at . % and a thickness of 10 to 90 nm . at least one coating layer x adjoins a coating layer y . the novel coatings exhibit significantly improved wear resistance .