Invention Grant
- Patent Title: Hard film, hard film formed body, and rolling bearing
- Patent Title (中): 硬膜,硬膜成型体和滚动轴承
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Application No.: US14346301Application Date: 2012-09-21
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Publication No.: US09347491B2Publication Date: 2016-05-24
- Inventor: Hideyuki Tsutsui , Kouya Oohira , Masaki Nakanishi
- Applicant: NTN CORPORATION
- Applicant Address: JP Osaka
- Assignee: NTN CORPORATION
- Current Assignee: NTN CORPORATION
- Current Assignee Address: JP Osaka
- Agency: Hedman & Costigan, P.C.
- Agent James V. Costigan; Kathleen A. Costigan
- Priority: JP2011-207936 20110922; JP2011-207983 20110922; JP2011-208005 20110922
- International Application: PCT/JP2012/074217 WO 20120921
- International Announcement: WO2013/042765 WO 20130328
- Main IPC: F16C33/58
- IPC: F16C33/58 ; F16C33/62 ; C23C14/02 ; C23C14/06 ; F16C33/64 ; F16C33/32 ; F16C33/34 ; F16C33/56 ; F16C33/66 ; C23C14/34 ; C23C28/00

Abstract:
The present invention provides a hard film which has high wear resistance and excellent peeling resistance and can be prevented from peeling off a base material over a long period of time and a hard film formed body on which the hard film is formed. A hard film (8) has a structure composed of a first mixed layer (8a), consisting mainly of Cr and WC, which is formed directly on a raceway surface (2a) of an inner ring (2) (base material) of a rolling bearing, a second mixed layer (8b), consisting mainly of WC and DLC, which is formed on the first mixed layer (8a), and a surface layer (8c), consisting mainly of DLC, which is formed on the second mixed layer (8b). In the first mixed layer (8a), a content rate of the Cr becomes continuously or stepwise lower and that of the DLC becomes continuously or stepwise higher from a side of the base material toward a side of the second mixed layer (8b). In the second mixed layer (8b), a content rate of the WC becomes continuously or stepwise lower and that of the DLC becomes continuously or stepwise higher from a side of the first mixed layer (8a) toward a side of the surface layer (8c). A content of hydrogen in the second mixed layer (8b) is set to 10 to 45 atomic percent.
Public/Granted literature
- US20140219595A1 HARD FILM, HARD FILM FORMED BODY, AND ROLLING BEARING Public/Granted day:2014-08-07
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