Title:
SURFACE-COATED CUTTING TOOL WITH RIGID COATING LAYER EXHIBITING EXCELLENT CHIPPING RESISTANCE
Document Type and Number:
WIPO Patent Application WO/2016/190332
Kind Code:
A1
Abstract:
Provided is a coated tool including a rigid coating layer which, when used in high-speed intermittent cutting, has excellent chipping resistance and fracture resistance and exhibits excellent wear resistance over a long period.
The rigid coating layer comprises a composite nitride or composite carbonitride layer represented by the empirical formula (Ti1-xAlx)(CyN1-y). The rigid coating layer includes crystal grains of the composite nitride or composite carbonitride which have an NaCl-form face-centered cubic structure and in which there are periodic concentration changes, the directions of the periodic concentration changes at least include a direction that makes an angle of 30º or less with a plane parallel to the surface of the tool base. Preferably, the rigid coating layer has a columnar structure, the areal proportion of regions where there are periodic Ti/Al concentration changes is 40% by area or higher, the periods of concentration change are 1-10 nm, the difference between the average of maximal values of the Al content x that periodically changes and the average of minimal values thereof is 0.01-0.1, and at crystal grain boundaries, there are fine crystal grains of a hexagonal structure having an average grain diameter of 0.01-0.3 µm, in an amount of 5% by area or less.
Inventors:
YANAGISAWA KOUSUKE (JP)
TATSUOKA SHO (JP)
SATO KENICHI (JP)
YAMAGUCHI KENJI (JP)
TATSUOKA SHO (JP)
SATO KENICHI (JP)
YAMAGUCHI KENJI (JP)
Application Number:
PCT/JP2016/065396
Publication Date:
December 01, 2016
Filing Date:
May 25, 2016
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP (JP)
International Classes:
B23B27/14; B23C5/16; C23C16/36
Foreign References:
JP2014210333A | 2014-11-13 | |||
JP2007196365A | 2007-08-09 | |||
JP2003211304A | 2003-07-29 | |||
JPH1161380A | 1999-03-05 | |||
JP2015193071A | 2015-11-05 | |||
JP2016064485A | 2016-04-28 |
Other References:
See also references of EP 3305446A4
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