Mitsubishi Materials Corporation

Kenichi Sato

Sho Tatsuoka

Kenji Yamaguchi

Shin Nishida

Kousuke Yanagisawa

Takuya Ishigaki

A surface-coated cutting tool has a hard coating layer including an upper layer &#x3b1;, an adhesion layer &#x3b2;, and a lower layer &#x3b3;. The upper layer &#x3b1; is formed of an &#x3b1;-AlOlayer formed under low temperature conditions. The adhesion layer &#x3b2; includes a TiCN layer having a thickness of 0.5 &#x3bc;m or more in an outermost layer and contains 0.5 to 3 &#x3bc;m to a maximum depth of 0.5 &#x3bc;m toward the inside in a layer thickness direction of the TiCN layer from the interface between the TiCN layer and the upper layer &#x3b1;. The lower layer &#x3b3; is formed of (TiAl)(CN) of a single phase of a NaCl type face-centered cubic structure, in which an average content ratio Xof Al and an average content ratio Yof C in this composition formula satisfy 0.60&#x2264;X&#x2264;0.95 and 0&#x2264;Y&#x2264;0.005.

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

A surface-coated cutting tool including at least a TiAlCN layer, in which the layer is expressed by a composition formula: (TiAl)(CN), an average content ratio X of Al and an average content ratio Y of C (here, X and Y are atomic ratios) satisfy 0.60&#x2264;X&#x2264;0.95 and 0&#x2264;Y&#x2264;0.005, respectively, an average content ratio Z of Cl in the total amount of atoms configuring the TiAlCN phase (here, Z is an atomic ratio) satisfies 0.0001&#x2264;Z&#x2264;0.004, plane spacings d(111) and d(200) are respectively calculated from X-ray diffraction spectra of (111) plane and (200) plane of crystal grains having a NaCl type face-centered cubic structure in the TiAlCN layer measured by using an X-ray diffraction device, and an absolute value &#x394;A=|A(111)&#x2212;A(200)| defined as A(111)=3d(111) and A(200)=2d(200) satisfies 0.007 &#x212b;&#x2264;&#x394;A&#x2264;0.05.

Surface-coated cutting tool having hard coating layer exhibiting excellent chipping resistance and wear resistance

The hard coating layer of the cutting tool includes a complex nitride or complex carbonitride layer expressed by the composition formula: (TiAl)(CN). xand ysatisfy 0.60&#x2264;x&#x2264;0.95 and 0&#x2264;y&#x2264;0.005. xis an average content ratio of Al in a total amount of Ti and Al, and yis an average content ratio of C in a total amount of C and N. Some crystal grains composing the complex nitride or complex carbonitride layer have a cubic structure. In crystal grains having the cubic structure, the average crystal grain misorientaion is 1 degree or more; or 2 degrees or more, based on analysis of the polished surface perpendicular to a surface of the layer. A peak exists in 1-2 degrees of the average crystal grain misorientation in the frequency distribution of the average crystal grain misorientation and the area ratio.

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

In a hard coating layer that contains at least any of a layer of a complex nitride or a complex carbonitride (composition formula: (TiAl)(CN)) of chemically-vapor-deposited Ti and Al, a layer of a complex nitride or a complex carbonitride (composition formula: (TiAlMr)(CNi)) of Ti, Al, and Me, and a layer of a complex nitride or a complex carbonitride (composition formula: (CrAl)(CN) of Cr and Al in a surface-coated cutting tool, some crystal grains that form the layer of a complex nitride or a complex carbonitride have cubic structures, and a predetermined average crystal grain misorientation and inclined angle frequency distribution are present in the crystal grains that have cubic structures.

Surface-coated cutting tool with hard coating layer that exhibits excellent chipping resistance and manufacturing method thereof

In this surface-coated cutting tool, a hard coating layer includes at least a layer of a complex nitride or complex carbonitride expressed by a composition formula: (CrAl)(CN) or a layer of a complex nitride or complex carbonitride expressed by a composition formula: (TiAlMe)(CN), crystal grains configuring the layer of a complex nitride or complex carbonitride having an NaCl type face-centered cubic structure are present, and predetermined average crystal grain misorientation and inclined angle frequency distribution are present in the crystal grains having an NaCl type face-centered cubic structure.

Surface-coated cutting tool and manufacturing method of the same

A surface-coated cutting tool has a hard coating layer on a tool body. The hard coating layer includes a (TiAl)(CN) layer (the average amount Xavg of Al and the average amount Yavg of C satisfy 0.60&#x2264;Xavg&#x2264;0.95 and 0&#x2264;Yavg&#x2264;0.005). Crystal grains having an NaCl type face-centered cubic structure in the layer have {111} orientation, a columnar structure in which the average grain width of the individual crystal grains having an NaCl type face-centered cubic structure is 0.1 &#x3bc;m to 2.0 &#x3bc;m and the average aspect ratio is 2 to 10 is included, and in the individual crystal grains having an NaCl type face-centered cubic structure, a periodic compositional variation in Ti and Al in the composition formula: (TiAl)(CN) is present and the difference between the average of maximum values of x and the average of minimum values thereof is 0.03 to 0.25.

A coated tool includes a hard coating layer that is formed with a (Ti,Al)(C,N) layer on its surface, the layer including an upper layer where a periodic compositional variation in Ti and Al is present in crystal grains having an NaCl type face-centered cubic structure, and a lower layer where a periodic compositional variation in Ti and Al is not present. The upper layer has a high Al amount, while the lower layer has a low Al amount. A value of I(200)/I(111) of the upper layer is greater than 10 and that of the lower layer is less than 3. The lower layer has a composition inclined structure where the Al amount increases from a tool body side towards an upper layer side. The lower layer contains multiple layers, where the Al amount of each layer can increase from the tool body side towards the upper layer side.

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

A surface-coated cutting tool of the present invention includes: a cutting tool body; and a hard coating layer provided on a surface of the cutting tool body, in which the hard coating layer includes a complex nitride or carbonitride layer, which is expressed by a composition formula: (TiAl)(CN), the average content ratio Xof Al and the average content ratio Yof C in the complex nitride or carbonitride layer satisfy 0.60&#x2264;X&#x2264;0.95 and 0&#x2264;Y&#x2264;0.005, provided that each of Xand Yis in atomic ratio, the complex nitride or carbonitride layer includes crystal grains with a cubic structure, and in the crystal grains with the cubic structure, a composition of Ti and Al is periodically changed in a direction of the normal line to the surface of the cutting tool body.

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Naka, Japan

Kenichi Sato