COMPOSITE HARD CARBON COATING FILM, TOOL COATED WITH COMPOSITE HARD CARBON COATING FILM, AND METHOD FOR PRODUCING COMPOSITE HARD CARBON COATING FILM

WIPO Patent Application WO/2021/002027

A1

A tool coated with a composite hard carbon coating film, which can have high hardness even when formed in a large thickness; and a method for producing a composite hard carbon coating film.　In a composite hard carbon coating film 24, a first hard carbon layer 26 located on the side of a tool base material 22 has a thickness t1 of 0.2 to 3.0 μm and a density d1 of 2.1 g/cm3 to 2.4 g/cm3, a second hard carbon layer 28 adhered on the first hard carbon layer 26 has a thickness t2 of 1.0 to 9.0 μm and a density d2 of 2.5 g/cm3 to 3.0 g/cm3. Because the density of the first hard carbon layer 26 located on the side of the tool base material 22 is relatively smaller than the density of the second hard carbon layer 28 arranged on the first hard carbon layer 26, the first hard carbon layer 26 having a relatively smaller density can act as a cushioning layer even when the overall hardness and the overall thickness of the coating film are increased. As a result, the detachment of the coating film can be prevented and high wear resistance can be achieved as a whole.

MURASAWA KOKI (JP)
YOSHITAKE TSUYOSHI (JP)
ALI MOHAMED ALI EBRAHIM ABDELGAWAD (JP)

PCT/JP2019/026750

January 07, 2021

July 04, 2019

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OSG CORP (JP)
UNIV KYUSHU NAT UNIV CORP (JP)

C23C14/06; B23B5/16; B23B27/14; B23B51/00

JP2007083382A	2007-04-05
JP2017053435A	2017-03-16
JP2010043347A	2010-02-25
JP2003175406A	2003-06-24

IKEDA Haruyuki et al. (JP)

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