公开(公告)号：US20190017549A1

公开(公告)日：2019-01-17

申请号：US16070554

申请日：2016-08-25

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Masahiro GOTO ,  Michiko SASAKI ,  Akira KASAHARA ,  Masahiro TOSA

IPC: F16C33/34 ,  C23C14/08 ,  C23C14/50

Abstract: ZnO sputtering is performed while a rolling body is housed in a basket made of a metal wire and is rotated. By setting a ratio of a mesh size of the basket to a diameter of the rolling body in a range of 40 to 95%, fine and uniform ZnO coating can be formed on a surface of the rolling body. By using the rolling body with ZnO coating prepared in this manner in a bearing which is rotated at high speed in a high-load state, a friction coefficient can significantly be lowered in comparison with a case of no coating.

公开(公告)号：US20180155183A1

公开(公告)日：2018-06-07

申请号：US15576376

申请日：2016-05-25

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Michiko SASAKI ,  Masahiro GOTO ,  Akira KASAHARA ,  Masahiro TOSA

IPC: B81B3/00 ,  C23C14/35 ,  C10M103/06 ,  C23C14/08

CPC classification number: B81B3/0005 ,  B81B3/0078 ,  B81B7/02 ,  B81B2201/035 ,  B81C2201/0119 ,  B81C2201/0181 ,  C10M103/06 ,  C10M2201/0623 ,  C23C14/08 ,  C23C14/086 ,  C23C14/35

Abstract: Low friction coating of the present invention includes a boron-doped zinc oxide thin film, wherein piezoelectric polarization in a vertical direction perpendicular to a film surface and a lateral direction horizontal to the film surface occurs and a magnitude of the piezoelectric polarization in the vertical direction is within 150 pm and a magnitude of the piezoelectric polarization in the lateral direction is within 100 pm at 90% or more of measurement points. This makes it possible to greatly decrease the friction in a nanometer order.