Hard film and hard film-coated tool
AssigneeKabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
InventorsKenji Yamamoto, Susumu Kujime
Life of this patent
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Abstract
A hard coating film to be applied to the surface of a tool, said hard coating film having a composition represented by the formula Al1-a-b-cSiaMgbMc(BxCyNz), where M denotes at least one species of elements selected from Nb, V, Zr, Cr, Ti, Cu, and Y, and a, b, c, x, y, and z represent atomic ratios such that 0≦a≦0.35, 0≦b≦0.2, 0.03≦a+b≦0.5, 0≦c≦0.1, 0.9≦Al+Si+Mg, 0≦x≦0.2, 0≦y≦0.4, 0.5≦z≦1, and x+y+z=1. A tool coated with the hard coating film defined above. The hard coating film has excellent wear resistance owing to its improved hardness, oxidation resistance, and toughness. It is used for coating on a tool to improve wear resistance.
Claims4
A hard coating film to be applied to the surface of a tool, said hard coating film having a composition represented by the formula Al1-a-b-cSiaMgbMc(BxCyNz), where M denotes at least one species of elements selected from Nb, V, Zr, Cr, Ti, Cu, and Y, and a, b, c, x, y, and z represent atomic ratios such that 0≦a≦0.35, 0≦b≦0.2, 0.03≦a+b≦0.5, 0≦c≦0.1, 0.9≦Al+Si+Mg, 0≦x≦0.2, 0≦y≦0.4, 0.5≦z≦1, and x+y+z=1.
A hard coating film to be applied to the surface of a tool, said hard coating film being composed of layers A and layers B which are placed alternately one over another, said layer A having a composition represented by the formula Al1-a-b-cSiaMgbMc(BxCyNz), where M denotes at least one species of elements selected from Nb, V, Zr, Cr, Ti, Cu, and Y, and a, b, c, x, y, and z represent atomic ratios such that 0≦a≦0.35, 0≦b≦0.2, 0.03≦a+b≦0.5, 0≦c≦0.1, 0.9≦Al+Si+Mg, 0≦x≦0.2, 0≦y≦0.4, 0.5≦z≦1, and x+y+z=1, and said layer B being composed of a compound of N, CN, BN, or BCN with at least one species of elements selected from Groups 4a, 5a, and 6a and Al, Si, and Y, and each of said layers A and layers B having a thickness not smaller than 2 nm and not larger than 200 nm.
Dependencies are inferred from the claim text.