Surface-treated mold and method of producing surface-treated mold

Patent metadata

Field	Value
Publication number	US-9433998-B2
Application number	US-201414148165-A
Country	US
Kind code	B2
Filing date	Jan 6, 2014
Priority date	Nov 27, 2009
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

A surface-treated mold that includes a mold, a metal layer that is provided on a surface of the mold and contains at least one metal selected from nickel, chromium, tungsten and brass, and a carbon film that is provided on a surface of the metal layer, wherein the metal layer contains carbon, and the carbon concentration in the metal layer is higher between the boundary with the carbon film and the center of the metal layer than that between the boundary with the mold and the center of the metal layer.

First claim

What is claimed is:

1. A method of producing a surface-treated mold, comprising:
forming an amorphous metal layer that contains at least one metal selected from the group consisting of nickel, chromium, tungsten and brass on a surface of a mold; and
forming a carbon film over the amorphous metal layer while heating the amorphous metal layer at a temperature of 410° C. to 510° C.,
wherein the mold is made of tool steel or iron.

2. The method according to claim 1 , wherein the amorphous metal layer is formed by electroless nickel plating.

3. The method according to claim 1 , wherein a gaseous mixture of a hydrocarbon gas and a diluent gas is supplied for at least a part of the time period during which the carbon film is formed on the surface of the amorphous metal layer.

4. The method according to claim 1 , wherein a gaseous mixture of acetylene and ammonia is supplied for at least a part of the time period during which the carbon film is formed on the surface of the amorphous metal layer.

5. The method according to claim 4 , wherein the carbon film on the surface of the amorphous metal layer is formed by supplying a gaseous mixture of acetylene and ammonia and subsequently supplying only ammonia.

6. The method according to claim 1 , wherein a carbon solid-solution diffusion layer is formed between the amorphous metal layer and the carbon film.

7. The method according to claim 1 , wherein the carbon film is fibrous.

8. The method according to claim 1 , wherein the carbon film is formed of at least one of carbon nanocoils, carbon nanotubes and carbon nanofilaments.

Assignees

• Toyota Motor Co Ltd

Inventors

• Furukawa Yuichi
• Yaokawa Jun
• Iwata Yasushi

Classifications

• B22C9/061 Primary

  Materials which make up the mould · CPC title

• C23C8/02

  Pretreatment of the material to be coated (C23C8/04 takes precedence) · CPC title

• C23C18/165

  Multilayered product (layered product B32B) · CPC title

• B22D17/2209

  Selection of die materials (for permanent moulds B22C9/061) · CPC title

• C23C28/00

  Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D · CPC title