US 12,270,102 B2
Cutting tool
Susumu Okuno, Itami (JP); Takato Yamanishi, Itami (JP); Masahito Hikiji, Itami (JP); and Fumiyoshi Kobayashi, Itami (JP)
Assigned to SUMITOMO ELECTRIC HARDMETAL CORP., Itami (JP)
Appl. No. 17/924,366
Filed by Sumitomo Electric Hardmetal Corp., Itami (JP)
PCT Filed May 21, 2021, PCT No. PCT/JP2021/019380
§ 371(c)(1), (2) Date Nov. 24, 2022,
PCT Pub. No. WO2022/244242, PCT Pub. Date Nov. 24, 2022.
Prior Publication US 2024/0218504 A1, Jul. 4, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C23C 16/40 (2006.01); C23C 16/32 (2006.01); C23C 16/34 (2006.01); C23C 28/04 (2006.01)
CPC C23C 16/403 (2013.01) [C23C 16/32 (2013.01); C23C 16/34 (2013.01); C23C 28/042 (2013.01); C23C 28/044 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A cutting tool comprising a substrate and a coating provided on the substrate,
the coating comprising:
a first alumina layer provided on the substrate,
a titanium compound layer provided directly on the first alumina layer, and
a second alumina layer provided directly on the titanium compound layer,
wherein a portion adjacent to the titanium compound layer in the first alumina layer serves as an interface region,
a portion that is not the interface region in the first alumina layer serves as a non-interface region,
a content of nitrogen in the interface region is 0.2 at % or more and 11 at % or less, and
a content of nitrogen in the non-interface region is 0 at % or more and 0.15 at % or less; and
the titanium compound layer comprises a layer of titanium carbonitroxide adjacent to the first alumina layer.