Tool coated with multilayered hard film

Abstract

Abstract PURPOSE:To obtain the titled tool for high-speed cutting having superior wear resistance and toughness by successively coating a hard alloy substrate with a plurality of multilayered films each composed of the 1st layer of Al2O3 or the like, the 2nd layer of BN or the like, and the 3rd layer of cubic BN or the like so that the 1st layers are positioned on the substrate side. CONSTITUTION:A multilayered film is composed of the 1st layer of a compound selected from the carbides, nitrides and oxides of the group IVa, Va and VIa metals, Al2O3 and BN, a solid soln. or a mixture of such compounds, the 2nd layer of the nitride of a group IVa, Va or VIa metal and/or BN, and the 3rd layer which is a cubic BN layer or a layer contg. cubic BN. The surface of a substrate of at least one among a hard alloy, cermet and ceramics is successively coated with 2-6 multilayered films each having said structure so that the 1st layers are positioned on the substrate side. The thickness of the resulting film is regulated to 2-20mum, and that of the 3rd layer to 0.5-5mum.

Inventors

• 👤 Minoru Nakano
• 👤 稔 中野
• 👤 Masaaki Tobioka
• 👤 正明 飛岡

Bibliographic Details