US 2018/0154463 A1Published application

Surface-coated cutting tool in which hard coating layer exhibits excellent chipping resistance

AssigneeMitsubishi Materials Corporation

InventorsKousuke YANAGISAWA, Sho TATSUOKA, Kenichi SATO, Kenji YAMAGUCHI

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Abstract

A coated tool has a hard coating layer including a layer of a complex nitride or complex carbonitride expressed by (Ti1-xAlx)(CyN1-y). A periodic concentration variation is present in crystal grains of a complex nitride or complex carbonitride having a NaCl type face-centered cubic structure in the layer. The periodic concentration variation direction includes a direction at 30 degrees or less with respect to a surface of a tool body. An area percentage of a periodic concentration variation of Ti and Al is 40% or more. The concentration variation period is 1 to 10 nm. A difference between an average of local maximums and an average of local minimums of a periodically varying amount x of Al is 0.01 to 0.1. Fine crystal grains having a hexagonal structure with an average grain size of 0.01 to 0.3 μm are present at grain boundaries in 5% or less of the area.

Claims7

Dependent claims

A surface-coated cutting tool comprising:

a tool body, wherein
a hard coating layer is provided on a surface of the tool body made of any of tungsten carbide-based cemented carbide, titanium carbonitride-based cermet, or a cubic boron nitride-based ultrahigh-pressure sintered body,
(a) the hard coating layer includes at least a layer of a complex nitride or complex carbonitride of Ti and Al with an average layer thickness of 1 to 20 μm,
(b) the layer of a complex nitride or complex carbonitride includes at least crystal grains of a complex nitride or complex carbonitride having a NaCl type face-centered cubic structure, and
(c) at least the crystal grains having a NaCl type face-centered cubic structure in which, in a case where the layer of a complex nitride or complex carbonitride is analyzed in an arbitrary section perpendicular to the surface of the tool body, a periodic concentration variation of Ti and Al is present in the crystal grains having a NaCl type face-centered cubic structure, and when a direction in which a period of a concentration variation in the periodic concentration variation of Ti and Al is minimized is obtained, an angle between the direction in which the period of the concentration variation is minimized and the surface of the tool body is 30 degrees or less, are present.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/576,056Filed 25 May 2016
Priority: JP 2015-10685126 May 2015
Published: 7 Jun 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B23C 5/16
Milling-cutters: characterised by physical features other than shape
C23C 16/36
Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides: carbonitrides
C23C 16/45523
Characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber: pulsed gas flow or…
C23C 28/044
Only coatings of inorganic non-metallic material: coatings specially adapted for cutting tools or wear applications