公开(公告)号：US20200217416A1

公开(公告)日：2020-07-09

申请号：US16624781

申请日：2018-06-15

申请人： NIPPON PISTON RING CO., LTD. ,  NIPPON ITF, INC.

发明人： Takahiro OKAZAKI ,  Yoshihiro ITO ,  Hiroyuki SUGIURA ,  Shinya KANAZAWA ,  Hideki MORIGUCHI ,  Akinori SHIBATA ,  Takehiko OOSHIRO

IPC分类号： F16J9/26 ,  C23C14/16 ,  C23C14/32 ,  C01B32/05

摘要： A sliding member (10) including a coating film (1) composed of a hard carbon layer on a sliding surface (16) of a base material (11). The coating film has, when a cross section thereof is observed by a bright-field TEM image, a thickness within a range of 1 μm to 50 μm, and is configured by repeating units including black hard carbon layers (B), relatively shown in black, and white hard carbon layers (W), relatively shown in white, and laminated in a thickness direction, and comprise an inclined region, provided on a base material side, where thicknesses of white hard carbon layers (W) of the repeating units gradually increase in a thickness direction, and a homogeneous region\, provided on a surface side of the sliding member, where thicknesses of the white hard carbon layers (W) of the repeating units are the same or substantially the same in the thickness direction.