| 摘要 |
An object of the present invention is to provide a hard-material-coated member which is the most suitable as a long-life mold for plastic working which is used for plastic working of metals such as cold or warm-hot forging or pressing and is required to have wear resistance, and as a long-life casting member having excellent resistance to waste by melting and wear resistance. In the present invention, there is provided a hard-material-coated member with an excellent durability comprising a metal as base material and having coating layers formed at least on its working plane by physical vapor deposition, wherein at least three layers, i.e., a layer a as the outermost layer, a layer c just above the base material and a layer b between the layer a and the layer c are formed as the coating layers; the hardness values of these layers in terms of hardness symbol HV 0.025 are as follows:
2500 > (the hardness of the layer a) > 1000,
3500 > (the hardness of the layer b) > 2300,
2500 > (the hardness of the layer c) > 1000,
(500 + the hardness of the layer a) < (the hardness of the layer b), and
(500 + the hardness of the layer c) < (the hardness of the layer b); the thickness of the layer b is smaller than that of the layer c; and the total thickness of the coating layers is 5 to 15 µm. |
