Hard coating film having anti-adhesion property to soft metal

Patent metadata

Field	Value
Publication number	US-9410235-B2
Application number	US-201314760533-A
Country	US
Kind code	B2
Filing date	Dec 26, 2013
Priority date	Jan 29, 2013
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

The invention provides a hard coating film insusceptible to adhesion to a soft metal, the hard coating film being suitable for use as a coating on the surface of, for example, a die in contact with the soft metal. Further, the hard coating film includes a metal element containing at least two species of elements selected from the group consisting of Ti, Al, and Cr, and a non-metal element containing O (oxygen) only, or O and at least one species selected from the group consisting of C and N. A proportion accounting for the O in the total non-metal element is not less than 0.2, in atom ratio.

First claim

The invention claimed is:

1. A hard coating, comprising:
at least two metal elements selected from the group consisting of Ti, Al, and Cr; and
a non-metal element comprising O only, or comprising O and at least one element selected from the group consisting of C and N,
wherein relative to the non-metal element in total, an atomic ratio of O is not less than 0.2.

2. The hard coating film according to claim 1 , having a surface with an arithmetic-mean roughness of 0.01 μm or more and 3 μm or less.

3. The hard coating film according to claim 1 ,
wherein
the metal elements comprises Ti, Cr, and Al, and
relative to the metal elements in total, Ti, Cr, and Al have the following atomic ratios, respectively:
Ti:0.10 or more and 0.40 or less;
Cr:0.10 or more and 0.40 or less; and
Al:0.40 or more and 0.70 or less.

4. The hard coating film according to claim 1 ,
wherein
the metal elements comprise Ti, Cr, Al, and Si, and
relative to the metal elements in total, Ti, Cr, Al, and Si have the following atomic ratios, respectively:
Ti:0.10 or more and 0.40 or less;
Cr:0.10 or more and 0.40 or less;
Al:0.40 or more and 0.70 or less; and
Si:0.010 or more and 0.10 or less.

5. The hard coating film according to claim 1 ,
wherein
a part of the metal elements is replaced with at least one species of metal element selected from the group consisting of a group 4 element, a group 5 element, a group 6 element, Si, Y, and B, and
relative to the metal elements in total, an atomic ratio of the replaced is up to 0.2.

6. A die, having a surface coated with the hard coating film according to claim 1 .

7. The hard coating film according to claim 1 , which has a thickness of 0.5 μm to 10 μm.

8. The hard coating film according to claim 1 , which has a thickness of 0.5 μm to 5 μm.

9. The hard coating film according to claim 1 , wherein the metal elements comprise Ti, Cr and Al.

10. The hard coating film according to claim 1 , wherein the metal elements comprise Ti, Cr, Al and Si.

11. The hard coating film according to claim 1 , having a surface with an arithmetic-mean roughness of 0.1 μm or more and 2.5 μm or less.

12. The hard coating film according to claim 1 , having a surface with an arithmetic-mean roughness of 0.5 μm or more and 2 μm or less.

13. The hard coating film according to claim 1 , wherein the non-metal element comprises O only.

14. The hard coating film according to claim 1 , wherein the non-metal element comprises O and at least one element selected from the group consisting of C and N.

15. The hard coating film according to claim 1 , wherein relative to the non-metal element in total, the atomic ratio of O is not less than 0.5.

16. The hard coating film according to claim 1 , wherein relative to the non-metal element in total, the atomic ratio of O is not less than 0.7.

17. A method for making a hot-working workpiece, the method comprising:
employing the die according to claim 6 in making the hot-working workpiece, which comprises at least one species of soft metal selected from the group consisting of Zn, Sn, Al, and Mg.

18. A method for making a hot-working Zn-coated steel sheet, the method comprising:
employing the die according to claim 6 in making the hot-working Zn-coated steel sheet.

19. A die, having a surface coated with the hard coating film according to claim 2 .

Assignees

• Kobe Steel Ltd
• Kobe Steel Ltd

Inventors

• Yamamoto Kenji

Classifications

• C09D1/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title

• B21D37/01 Primary

  Selection of materials · CPC title

• B21D28/00

  Shaping by press-cutting; Perforating · CPC title

• B21D22/208

  by heating the blank or deep-drawing associated with heat treatment (C21D takes precedence) · CPC title

• C23C14/0676 Primary

  Oxynitrides · CPC title