DLC-COATED TOOL

WIPO Patent Application WO/2008/149824

A1

A DLC-coated tool produced by forming a substantially hydrogen-free DLC film on a substrate, wherein the DLC film has a density of 3.0 to 3.4g/cm3 and a nanoindentation hardness of 40 to 100GPa and wherein in the surface scanning test with a stylus type surface profile measuring apparatus provided with a stylus whose point has a radius of curvature of 2μm at a measurement feed of 0.01mm, the ratio of the absolute value of a difference between the arithmetic mean surface roughness of the substrate before film formation and the arithmetic mean roughness of the DLC film to the thickness of the DLC film, ΔRa/t, is 0.05 or below and the ratio of the occupancy area ratio (s) of convexed and recessed parts of the DLC film due to the adhesion or desorption of foreign matter to the thickness (t) of the film, s/t, is 0.01 (%/nm) or below.

JP2540904	[Title of Invention] Cutting tool made of surface-coated hard material
JPS63191504	CUTTING TOOL MADE OF SURFACE COATED ALUMINUM OXIDE RADICAL CERAMICS

TAKIKAWA HIROFUMI (JP)
HASEGAWA YUSHI (JP)
TAKI MAKOTO (JP)

PCT/JP2008/060089

December 11, 2008

May 26, 2008

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ONWARD CERAMIC COATING CO LTD (JP)
NAT UNIV CORP TOYOHASHI UNIV T (JP)
TAKIKAWA HIROFUMI (JP)
HASEGAWA YUSHI (JP)
TAKI MAKOTO (JP)

B23B27/14; B23B27/20; B23B51/00; B23C5/16; C23C14/06; C30B29/04

JP2003062708A	2003-03-05
JP2001192864A	2001-07-17
JPH07188916A	1995-07-25
JP2007083382A	2007-04-05
JP2003251503A	2003-09-09
JPH10324971A	1998-12-08

MATOBA, Motonori (MR Building 3F30-17, Hongo 1-chom, Bunkyo-ku Tokyo, JP)

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