Hard decorative member having gray-tone layer
AssigneeCitizen Watch Co., Ltd.
InventorKotaro Takazaki
Life of this patent
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Abstract
Provided is a hard decorative member excellent in scratch resistance. The hard decorative member according to the present invention includes a base and a hard decorative coating film layered on the base, in which the hard decorative coating film includes a gray-tone layer including a compound formed by a reaction of an alloy of Ti and one or two or more metals M2 selected from Nb, Ta, and V with a non-metallic element including at least carbon. It is preferable that the amount of carbon contained in the gray-tone layer is 30 to 70 atm % in a total of Ti, the metal M2, and the non-metallic element of 100 atm %.
Claims10
A hard decorative member, comprising a base and a hard decorative coating film layered on the base, wherein
- the hard decorative coating film comprises a gray-tone layer comprising a compound formed by a reaction of an alloy of Ti and one or two or more metals M2 selected from Nb, Ta, and V with a non-metallic element comprising at least carbon;
- an amount of Ti contained in the gray-tone layer is 20 to 90 mass % in a total of Ti and the metal M2 of 100 mass %;
- the gray-tone layer has a hardness of HV1500 or more;
- and
- in the gray-tone layer, a difference between a maximum value and a minimum value is 10% or less in reflectance measurement in a visible region (360 to 740 nm), and lightness L* is 60<L*≦73, each of color tone values a* and b* is −2.0 to 2.0, and a difference between a* and b* is 1.5 or less in Lab color space display.
A hard decorative member, comprising a base and a hard decorative coating film layered on the base,
- wherein the hard decorative coating film comprises a gray-tone layer comprising a compound formed by a reaction of an alloy of Ti and one or two or more metals M2 selected from Nb, Ta, and V with a non-metallic element comprising at least carbon;
- wherein the hard decorative coating film further comprises a hardening layer;
- the hardening layer is layered between the base and the gray-tone layer;
- and the hardening layer has higher hardness than the gray-tone layer.
A hard decorative member, comprising a base and a hard decorative coating film layered on the base,
- wherein the hard decorative coating film comprises a gray-tone layer comprising a compound formed by a reaction of an alloy of Ti and one or two or more metals M2 selected from Nb, Ta, and V with a non-metallic element comprising at least carbon;
- wherein the hard decorative coating film further comprises an adhesion layer, a gradient adhesion layer, and a hardening layer, each layer having two surfaces,
- wherein the adhesion layer, the gradient adhesion layer, the hardening layer, and the gray-tone layer are layered in this order on the base;
- wherein the gradient adhesion layer comprises a compound formed by a reaction of an alloy of Ti and one or two or more metals M2 selected from Nb, Ta, and V with one or two non-metallic elements selected from carbon and nitrogen, and an amount of the non-metallic element in the gradient adhesion layer is increased with increasing a distance from the base;
- wherein the hardening layer comprises a compound formed by a reaction of an alloy of Ti and one or two or more metals M2 selected from Nb, Ta, and V with one or two non-metallic elements selected from carbon and nitrogen, an amount of the non-metallic element in the hardening layer is equal to or more than a total amount of the carbon and the nitrogen in the one of the two surfaces of the gradient adhesion layer that is closer to the hardening layer, and the hardening layer has higher hardness than the gray-tone layer;
- and
- wherein an amount of the non-metallic element in the one of the two surfaces of the gray-tone layer that is closer to the hardening layer is equal to or more than an amount of the non-metallic element in the hardening layer.
Dependencies are inferred from the claim text.