AMORPHOUS CARBON COATING FILM AND AMORPHOUS-CARBON-COATING-FILM-COVERED TOOL

WIPO Patent Application WO/2016/098217

A1

Provided is an amorphous carbon coating film that has a hardness of 50 GPa or more, that does not peel off of a tool base material even when the coating film has a maximum thickness of more than 0.5 μm, and that has superior abrasion resistance even on cutting tools and the like. The present invention is formed by alternately laminating an A layer (a low-hydrogen amorphous carbon layer) 26 that has a hydrogen content of 3 at% or less and a thickness of 0.01-0.03 μm and a B layer (a high-hydrogen amorphous carbon layer) 28 that has a hydrogen content of more than 6 at% and a thickness that is equivalent to or less than the thickness of the A layer. As a result, the present invention can achieve an indentation hardness of 50 GPa or more, residual compressive stress that is caused by the hardness difference between the A layer 26 and a tool base material 22 is relieved by the B layer 28, and the present invention does not peel off of the tool base material 22 even at a maximum coating film thickness of more than 0.5 μm. Thus, a drill 10 wherein the tool base material 22 is partially or entirely covered by this amorphous carbon coating film 24 can achieve longevity as a tool and superior abrasion resistance.

SAKURAI MASATOSHI (JP)
GONDA HIDENOBU (JP)
SUGITA HIROAKI (JP)

PCT/JP2014/083484

June 23, 2016

December 17, 2014

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OSG CORP (JP)

C01B31/02; B23B27/14; B23B27/20; C23C14/06

JP2002322555A	2002-11-08
JPH11100671A	1999-04-13
JP2001261318A	2001-09-26
JP2008081630A	2008-04-10
JP2014129839A	2014-07-10
JP2013180501A	2013-09-12

IKEDA Haruyuki et al. (JP)
Haruyuki Ikeda (JP)

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