Patent ID: 8465852

Claim:
An oxide film coated material, comprising an oxide film, an underlying film, and a substrate, wherein: the oxide film coated material is formed by a cathodic arc ion plating process with a metallic target comprising Zr, Al and one or more of Mg and Y to form a multilayer comprising at least one underlying film alternately formed between at least one oxide film and the substrate, such that a layer-to-layer interval of the multilayer ranges from 10 to 500 nm; the oxide film has a Vickers microhardness ranging from 29 to 33 GPa and comprises (Zr 1-a-b-c Al a Mg b Y c )(O 1-x N x ) wherein formulas (1)-(5) are satisfied: 0≦a≦0.7 formula (1); 0≦b≦0.15 formula (2); 0≦c≦0.15 formula (3); 0<b+c formula (4); 0≦x≦0.5 formula (5), such that a is an atomic ratio of Al, b is an atomic ratio of Mg, c is an atomic ratio of Y, 1-a-b-c is an atomic ratio of Zr, x is an atomic ratio of N, and 1-x is an atomic ratio of O; and the underlying film is either: a first film consisting of one or more of elements of groups 4a, 5a and 6a, Al and Si; or a second film consisting of one or more of elements of groups 4a, 5a and 6a, Al and Si and one or more of C, N and O.