Film and method for manufacturing same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYuichi Furukawa, Shuji Sotozaki
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Abstract
Disclosed are a film with high strength which does not easily deteriorate, and a method for manufacturing the film. A step for manufacturing a film formed on the molding surface of a die, includes an initial film-forming step for forming, on the molding surface of the die, an initial film having a carbon film which has a plurality of nano-carbons, and to which a plurality of fullerenes are applied, and a nitrogen compound layer and a sulfurized layer which are situated between the carbon film and the die, and an intermittent heating step for intermittently heating the initial film formed in the initial film-forming step under a non-oxidizing atmosphere.
Claims4
1-4. (canceled)
A method for manufacturing a film formed on a molding surface of a die used for casting, comprising:
- an initial film-forming step for forming, on the molding surface of the die, an initial film including a carbon film, a nitrogen compound layer and a sulfurized layer, the carbon film having a plurality of nano-carbons, and a plurality of fullerenes which is applied to the carbon film, the nitrogen compound layer and the sulfurized layer being situated between the carbon film and the die;
- and
- an intermittent heating step for intermittently heating the initial film formed in the initial film-forming step under a non-oxidizing atmosphere, wherein
- in the intermittent heating step, an oil-based release agent is applied to the molding surface of the die on which the initial film is formed, and then the casting is performed a plurality of times using the die.
A film which includes a carbon film having a plurality of nano-carbons, and which is formed on a surface of an iron-based material, characterized by
- containing hard amorphous carbon, Fe4N, Fe3C, martensite, and Fe3O4, and
- sulfur-diffusion ratio in the carbon film which is over 50%.
Dependencies are inferred from the claim text.