SURFACE-COATED CUTTING TOOL

WIPO Patent Application WO/2021/192327

A1

[Solution] The invention is a surface-coated cutting tool having a hard coat layer over a tool base body. The hard coat layer comprises, sequentially from the tool base body to the surface, an inner layer, a lower part intermediate layer, an upper part intermediate layer, an auxiliary bonding layer, and an outer layer. The inner layer is a Ti carbonitride layer having a mean layer thickness of 4.0 to 20.0 μm. The lower part intermediate layer is a Ti nitride layer having a mean layer thickness of 0.1 to 2.0 μm. The upper part intermediate layer is a Ti carbonitride layer having a mean layer thickness of 0.1 to 2.5 μm. The grain boundary of the Ti nitride in the lower part intermediate layer and the grain boundary of the Ti carbonitride in the upper part intermediate layer continue from the grain boundary of the Ti carbonitride in the inner layer. The auxiliary bonding layer is a Ti carbonitride oxide layer having a mean layer thickness of 3 to 80 nm. The outer layer is an α-form aluminum oxide layer having a mean layer thickness of 2.0 to 20.0 μm. The orientation index TC (422) for the Ti carbonitride in the inner layer and the upper part intermediate layer is 3.0 or higher. The orientation index TC (0 0 12) for the α-form aluminum oxide in the outer layer is 5.0 or higher.

NAKAMUA EIJI (JP)
ABE MITSUHIRO (JP)
KAWANO KAZUHIRO (JP)

PCT/JP2020/022400

September 30, 2021

June 05, 2020

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MITSUBISHI MATERIALS CORP (JP)

B23B27/14; C23C16/30

WO2018234296A1	2018-12-27
WO2019170202A1	2019-09-12
WO2018158245A1	2018-09-07

JP2016137564A	2016-08-04
JP2019511378A	2019-04-25
JP2019171540A	2019-10-10
JP2005297141A	2005-10-27
JP2016137564A	2016-08-04
JP5872746B1	2016-03-01

See also references of EP 4129539A4

KIMURA Koichi et al. (JP)

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