Title:
CUTTING TOOL
Document Type and Number:
WIPO Patent Application WO/2022/244243
Kind Code:
A1
Abstract:
A cutting tool comprising: a base; and a coating film provided on the base, wherein the coating film includes a first alumina layer provided on the base, a titanium compound layer provided immediately on the first alumina layer, and a second alumina layer provided immediately on the titanium compound layer, a portion of the first alumina layer adjacent to the titanium compound layer forms an interface region, a portion of the first alumina layer but not the interface region forms a non-interface region, the content ratio of nitrogen in the interface region is 0.2-12 at%, the content ratio of nitrogen in the non-interface region is 0-0.15 at%, the titanium compound layer includes a multilayer-structure layer located adjacent to the first alumina layer, the multilayer-structure layer includes a first unit layer and a second unit layer, the first unit layer and the second unit layer are alternately layered in the multilayer-structure layer, the first unit layer is made of titanium carbonitride, and the second unit layer is made of titanium oxycarbonitride.
Inventors:
OKUNO SUSUMU (JP)
YAMANISHI TAKATO (JP)
HIKIJI MASAHITO (JP)
KOBAYASHI FUMIYOSHI (JP)
YAMANISHI TAKATO (JP)
HIKIJI MASAHITO (JP)
KOBAYASHI FUMIYOSHI (JP)
Application Number:
PCT/JP2021/019381
Publication Date:
November 24, 2022
Filing Date:
May 21, 2021
Export Citation:
Assignee:
SUMITOMO ELECTRIC HARDMETAL CORP (JP)
International Classes:
B23B27/14; B23B51/00; B23C5/16; C23C16/30
Domestic Patent References:
| WO2013031458A1 | 2013-03-07 | |||
| WO2019181786A1 | 2019-09-26 |
Foreign References:
| JP2016165789A | 2016-09-15 | |||
| JPH11347806A | 1999-12-21 | |||
| JP2013046959A | 2013-03-07 | |||
| JP2020037150A | 2020-03-12 | |||
| JP2003266213A | 2003-09-24 |
Other References:
See also references of EP 4144466A4
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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