US5766742A — Cutting blade made of titanium carbonitride-base …

Claim 1

Independent Claim 259 words

In a cutting blade made of a titanium carbonitride-base cermet comprising: 3 to 20% by weight of a metal binder phase, the principal ingredients of which are Co and/or Ni, 3 to 30% by weight of a single-structural hard phase comprising at least one component selected from the group consisting of carbide, nitride and carbonitride compounds of metal elements belonging to Groups 4a, 5a and 6a of the periodic table and a solid-solution comprising at least two said compounds, and the balance being a double-structural hard phase which comprises a core portion and a shell portion completely surrounding said core portion, wherein said core and shell portions comprise as substituents titanium carbonitride and/or a carbonitride compound of Ti and at least one element M selected from metal elements belonging to Groups 4a, 5a and 6a of the periodic table other than Ti, except that the shell portion must contain a carbonitride compound of at least M, and wherein said shell portion has a lower content of Ti and a higher content of M than those in the core portion, respectively; and incidental impurities, the improvement comprising: said double-structural hard phase is partly or wholly substituted with a discontinuous double-structural hard phase comprising a core portion and a shell portion, in which the shell portion is discontinuously distributed around the core portion so that the core portion is partially exposed to the metal binder phase, and said discontinuous double-structural hard phase occupies 30 or more area % of the total surface of the cermet in terms of electron-microscopic texture analysis.

Claim 2

Dependent Claim 259 words

In a cutting blade made of a titanium carbonitride-base cermet comprising: 3 to 20% by weight of a metal binder phase, the principal ingredients of which are Co and/or Ni, 3 to 30% by weight of a single-structural hard phase comprising at least one component selected from the group consisting of carbide, nitride and carbonitride compounds of metal elements belonging to Groups 4a, 5a and 6a of the periodic table and a solid-solution comprising at least two said compounds, and the balance being a double-structural hard phase which comprises a core portion and a shell portion completely surrounding said core portion, wherein said core and shell portions comprise as substituents titanium carbonitride and/or a carbonitride compound of Ti and at least one element M selected from metal elements belonging to Groups 4a, 5a and 6a of the periodic table other than Ti, except that the shell portion must contain a carbonitride compound of at least M, and wherein said shell portion has a lower content of Ti and a higher content of M than those in the core portion, respectively; and incidental impurities, the improvement comprising: said double-structural hard phase is partly or wholly substituted with a discontinuous double-structural hard phase comprising a core portion and a shell portion, in which the shell portion is discontinuously distributed around the core portion so that the core portion is partially exposed to the metal binder phase, and said discontinuous double-structural hard phase occupies 30 or more area % of the total surface of the cermet in terms of electron-microscopic texture analysis.

Claim 3

Dependent Claim 305 words

In a cutting blade made of a titanium carbonitride-base cermet comprising: 3 to 20% by weight of a metal binder phase, the principal ingredients of which are Co and/or Ni, 3 to 30% by weight of a single-structural hard phase comprising at least one component selected from the group consisting of carbide, nitride and carbonitride compounds of metal elements belonging to Groups 4a, 5a and 6a of the periodic table and a solid-solution comprising at least two said compounds, and the balance being a double-structural hard phase which comprises a core portion and a shell portion completely surrounding said core portion, wherein said core and shell portions comprise as substituents titanium carbonitride and/or a carbonitride compound of Ti and at least one element M selected from metal elements belonging to Groups 4a, 5a and 6a of the periodic table other than Ti, except that the shell portion must contain a carbonitride compound of at least M, and wherein said shell portion has a lower content of Ti and a higher content of M than those in the core portion, respectively; and incidental impurities, and said cutting blade having a hardened region in its surface portion, wherein the peak of Vickers hardness higher than the Vickers hardness of an inner portion is present within a range from the top surface of the blade to 50 μm under the top surface, the improvement comprising: said double-structural hard phase is partly or wholly substituted with a discontinuous double-structural hard phase comprising a core portion and a shell portion in which the shell portion is discontinuously distributed around the core portion so that the core portion is partially exposed to the metal binder phase, and said discontinuous double-structural hard phase occupies 30 or more area % of the total surface of the cermet in terms of electron-microscopic texture analysis.

Claim 4

Dependent Claim 305 words

In a cutting blade made of a titanium carbonitride-base cermet comprising: 3 to 20% by weight of a metal binder phase, the principal ingredients of which are Co and/or Ni, 3 to 30% by weight of a single-structural hard phase comprising at least one component selected from the group consisting of carbide, nitride and carbonitride compounds of metal elements belonging to Groups 4a, 5a and 6a of the periodic table and a solid-solution comprising at least two said compounds, and the balance being a double-structural hard phase which comprises a core portion and a shell portion completely surrounding said core portion, wherein said core and shell portions comprise as substituents titanium carbonitride and/or a carbonitride compound of Ti and at least one element M selected from metal elements belonging to Groups 4a, 5a and 6a of the periodic table other than Ti, except that the shell portion must contain a carbonitride compound of at least M, and wherein said shell portion has a lower content of Ti and a higher content of M than those in the core portion, respectively; and incidental impurities, and said cutting blade having a hardened region in its surface portion, wherein the peak of Vickers hardness higher than the Vickers hardness of an inner portion is present within a range from the top surface of the blade to 50 μm under the top surface, the improvement comprising: said double-structural hard phase is partly or wholly substituted with a discontinuous double-structural hard phase comprising a core portion and a shell portion in which the shell portion is discontinuously distributed around the core portion so that the core portion is partially exposed to the metal binder phase, and said discontinuous double-structural hard phase occupies 30 or more area % of the total surface of the cermet in terms of electron-microscopic texture analysis.

Claim 5

Dependent Claim 295 words

In a cutting blade made of a cermet having a coating thereon, comprising, as the cermet: 3 to 20% by weight of a metal binder phase, the principal ingredients of which are Co and/or Ni, 3 to 30% by weight of a single-structural hard phase comprising at least one component selected from the group consisting of carbide, nitride and carbonitride compounds of metal elements belonging to Groups 4a, 5a and 6a of the periodic table and a solid-solution comprising at least two said compounds, and the balance being a double-structural hard phase which comprises a core portion and a shell portion completely surrounding said core portion, wherein said core and shell portions comprise as substituents titanium carbonitride and/or a carbonitride compound of Ti and at least one element M selected from metal elements belonging to Groups 4a, 5a and 6a of the periodic table other than Ti, except that the shell portion must contain a carbonitride compound of at least M, and wherein said shell portion has a lower content of Ti and a higher content of M than those in the core portion, respectively; and incidental impurities, and said coating comprises at least one compound selected from titanium carbide, titanium nitride, titanium carbonitride, titanium carbonate-nitride compound, (Ti,Al)N, and aluminum oxide, in a thickness of 0.5 to 20 μm, the improvement comprising: said double-structural hard phase is partly or wholly substituted with a discontinuous double-structural hard phase ocomprising a core portion and a shell portion, in which the shell portion is discontinuously distributed around the core portion so that the core portion is partially exposed to the metal binder phase, and said discontinuous double-structural hard phase occupies 30 or more area % of the total surface of the cermet in terms of electron-microscopic texture analysis.

Claim 6

Dependent Claim 295 words

In a cutting blade made of a cermet having a coating thereon, comprising, as the cermet: 3 to 20% by weight of a metal binder phase, the principal ingredients of which are Co and/or Ni, 3 to 30% by weight of a single-structural hard phase comprising at least one component selected from the group consisting of carbide, nitride and carbonitride compounds of metal elements belonging to Groups 4a, 5a and 6a of the periodic table and a solid-solution comprising at least two said compounds, and the balance being a double-structural hard phase which comprises a core portion and a shell portion completely surrounding said core portion, wherein said core and shell portions comprise as substituents titanium carbonitride and/or a carbonitride compound of Ti and at least one element M selected from metal elements belonging to Groups 4a, 5a and 6a of the periodic table other than Ti, except that the shell portion must contain a carbonitride compound of at least M, and wherein said shell portion has a lower content of Ti and a higher content of M than those in the core portion, respectively; and incidental impurities, and said coating comprises at least one compound selected from titanium carbide, titanium nitride, titanium carbonitride, titanium carbonate-nitride compound, (Ti,Al)N, and aluminum oxide, in a thickness of 0.5 to 20 μm, the improvement comprising: said double-structural hard phase is partly or wholly substituted with a discontinuous double-structural hard phase ocomprising a core portion and a shell portion, in which the shell portion is discontinuously distributed around the core portion so that the core portion is partially exposed to the metal binder phase, and said discontinuous double-structural hard phase occupies 30 or more area % of the total surface of the cermet in terms of electron-microscopic texture analysis.

Claim 7

Dependent Claim 339 words

In a cutting blade made of a cermet having a coating thereon, said cermet comprising: 3 to 20% by weight of a metal binder phase, the principal ingredients of which are Co and/or Ni, 3 to 30% by weight of a single-structural hard phase comprising at least one component selected from the group consisting of carbide, nitride and carbonitride compounds of metal elements belonging to Groups 4a, 5a and 6a of the periodic table and a solid-solution comprising at least two said compounds, and the balance being a double-structural hard phase which comprises a core portion and a shell portion completely surrounding said core portion, wherein said core and shell portions comprise as substituents titanium carbonitride and/or a carbonitride compound of Ti and at least one element M selected from metal elements belonging to Groups 4a, 5a and 6a of the periodic table other than Ti, except that the shell portion must contain a carbonitride compound of at least M, and wherein said shell portion has a lower content of Ti and a higher content of M than those in the core portion, respectively; and incidental impurities, said cutting blade having a hardened region in its surface portion, wherein the peak of Vickers hardness higher than the Vickers hardness of an inner portion is present within a range from the top surface of the blade to 50 μm under the top surface, and said coating comprising at least one compound selected from titanium carbide, titanium nitride, titanium carbonitride, titanium carbonate-nitride compound, (Ti,Al)N, and aluminum oxide, in a thickness of 0.5 to 20 μm, the improvement comprising: said double-structural hard phase is partly or wholly substituted with a discontinuous double-structural hard phase ocomprising a core portion and a shell portion, in which the shell portion is discontinuously distributed around the core portion so that the core portion is partially exposed to the metal binder phase, and said discontinuous double-structural hard phase occupies 30 or more area % of the total surface of the cermet in terms of electron-microscopic texture analysis.

Claim 8

Dependent Claim 339 words

In a cutting blade made of a cermet having a coating thereon, said cermet comprising: 3 to 20% by weight of a metal binder phase, the principal ingredients of which are Co and/or Ni, 3 to 30% by weight of a single-structural hard phase comprising at least one component selected from the group consisting of carbide, nitride and carbonitride compounds of metal elements belonging to Groups 4a, 5a and 6a of the periodic table and a solid-solution comprising at least two said compounds, and the balance being a double-structural hard phase which comprises a core portion and a shell portion completely surrounding said core portion, wherein said core and shell portions comprise as substituents titanium carbonitride and/or a carbonitride compound of Ti and at least one element M selected from metal elements belonging to Groups 4a, 5a and 6a of the periodic table other than Ti, except that the shell portion must contain a carbonitride compound of at least M, and wherein said shell portion has a lower content of Ti and a higher content of M than those in the core portion, respectively; and incidental impurities, said cutting blade having a hardened region in its surface portion, wherein the peak of Vickers hardness higher than the Vickers hardness of an inner portion is present within a range from the top surface of the blade to 50 μm under the top surface, and said coating comprising at least one compound selected from titanium carbide, titanium nitride, titanium carbonitride, titanium carbonate-nitride compound, (Ti,Al)N, and aluminum oxide, in a thickness of 0.5 to 20 μm, the improvement comprising: said double-structural hard phase is partly or wholly substituted with a discontinuous double-structural hard phase ocomprising a core portion and a shell portion, in which the shell portion is discontinuously distributed around the core portion so that the core portion is partially exposed to the metal binder phase, and said discontinuous double-structural hard phase occupies 30 or more area % of the total surface of the cermet in terms of electron-microscopic texture analysis.

Claim 9

Dependent Claim 25 words

The cutting blade claimed in claim 1, wherein the mean grain sizes of the hard phases of the cermet are 0.1 to 1.5 μm, respectively.

Claim 10

Dependent Claim 25 words

The cutting blade claimed in claim 2, wherein the mean grain sizes of the hard phases of the cermet are 0.1 to 1.5 μm, respectively.

Claim 11

Dependent Claim 25 words

The cutting blade claimed in claim 3, wherein the mean grain sizes of the hard phases of the cermet are 0.1 to 1.5 μm, respectively.

Claim 12

Dependent Claim 25 words

The cutting blade claimed in claim 4, wherein the mean grain sizes of the hard phases of the cermet are 0.1 to 1.5 μm, respectively.

Claim 13

Dependent Claim 25 words

The cutting blade claimed in claim 5, wherein the mean grain sizes of the hard phases of the cermet are 0.5 to 1.2 μm, respectively.

Claim 14

Dependent Claim 25 words

The cutting blade claimed in claim 6, wherein the mean grain sizes of the hard phases of the cermet are 0.5 to 1.2 μm, respectively.

Claim 15

Dependent Claim 25 words

The cutting blade claimed in claim 7, wherein the mean grain sizes of the hard phases of the cermet are 0.5 to 1.2 μm, respectively.

Claim 16

Dependent Claim 25 words

The cutting blade claimed in claim 8, wherein the mean grain sizes of the hard phases of the cermet are 0.5 to 1.2 μm, respectively.

Claim 17

Dependent Claim 23 words

The cutting blade claimed in claim 3, wherein the coating contains a (Ti,Al)N coating layer having a thickness of 0.5 to 5 μm.

Claim 18

Dependent Claim 23 words

The cutting blade claimed in claim 4, wherein the coating contains a (Ti,Al)N coating layer having a thickness of 0.5 to 5 μm.

Claim 19

Dependent Claim 45 words

The cutting blade claimed in claim 3, wherein the coating contains a TiCN coating layer in a thickness of 0.5 to 5 μm having a longitudinal growth crystal structure in which crystal grains are elongated along a direction perpendicular to the surface of said cermet.

Claim 20

Dependent Claim 45 words

The cutting blade claimed in claim 4, wherein the coating contains a TiCN coating layer in a thickness of 0.5 to 5 μm having a longitudinal growth crystal structure in which crystal grains are elongated along a direction perpendicular to the surface of said cermet.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-06-15	2001-12-15	2002-06-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-06-15	2005-12-15	2006-06-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-06-15	2009-12-15	2010-06-16	$7700.00	Window Closed / Lapsed

Cutting blade made of titanium carbonitride-base cermet, and cutting blade made of coated cermet

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