The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2014
Filed:
Oct. 29, 2009
Kouya Oohira, Mie, JP;
Naoko Ito, Mie, JP;
Yoji Sato, Mie, JP;
Hideyuki Tsutsui, Mie, JP;
NTN Corporation, Osaka, JP;
Abstract
The present invention provides a hard multilayer film formed body which has an intermediate layer excellent in its adhesion to a base material and a DLC film which is a surface layer excellent in its wear resistance, prevents peeling from occurring between the DLC film and the intermediate layer, and is excellent in its wear resistance and a method for producing the same. A hard multilayer film formed bodyconsists of a multilayer film formed on a surface of a base materialconsisting of a cemented carbide material or a ferrous material. The multilayer film has (1) a film, composed mainly of DLC, which is formed as a surface layerof the multilayer film; (2) an intermediate layer, composed mainly of a metallic material, which is formed between the surface layerand the base material; and (3) a stress relaxation layer, composed mainly of carbon, which is formed between the intermediate layerand the surface layer. The stress relaxation layeris a graded layer whose hardness increases continuously or stepwise from a side of the intermediate layertoward a side of the surface layer