WO2025069218A1 - 超硬合金および切削工具 - Google Patents

超硬合金および切削工具 Download PDF

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Publication number
WO2025069218A1
WO2025069218A1 PCT/JP2023/035014 JP2023035014W WO2025069218A1 WO 2025069218 A1 WO2025069218 A1 WO 2025069218A1 JP 2023035014 W JP2023035014 W JP 2023035014W WO 2025069218 A1 WO2025069218 A1 WO 2025069218A1
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Prior art keywords
cemented carbide
binder phase
cobalt
hcp
area
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PCT/JP2023/035014
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English (en)
French (fr)
Japanese (ja)
Inventor
保樹 城戸
好博 木村
アノンサック パサート
寛之 荻原
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Priority to CN202380100037.9A priority Critical patent/CN121443763A/zh
Priority to PCT/JP2023/035014 priority patent/WO2025069218A1/ja
Priority to JP2024529596A priority patent/JP7666745B1/ja
Priority to TW113129381A priority patent/TW202513820A/zh
Publication of WO2025069218A1 publication Critical patent/WO2025069218A1/ja
Anticipated expiration legal-status Critical
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide

Definitions

  • This disclosure relates to cemented carbide and cutting tools.
  • Patent Document 1 cemented carbide alloys containing multiple tungsten carbide particles and a binder phase have been used as materials for cutting tools.
  • the cemented carbide of the present disclosure is A cemented carbide comprising a plurality of tungsten carbide particles and a binder phase,
  • the cemented carbide contains 89 volume % or more of the tungsten carbide particles and the binder phase in total,
  • the cemented carbide contains 1.8% by volume or more and 20% by volume or less of the binder phase,
  • the binder phase contains 80% by mass or more of cobalt,
  • the cemented carbide includes a first region within 15 ⁇ m from the surface and a second region more than 15 ⁇ m from the surface;
  • FIG. 1 is a schematic cross-sectional view of a cemented carbide according to a first embodiment.
  • FIG. 2 is a schematic diagram of a cutting tool according to a second embodiment.
  • the cemented carbide of the present disclosure is A cemented carbide comprising a plurality of tungsten carbide particles and a binder phase,
  • the cemented carbide contains 89 volume % or more of the tungsten carbide particles and the binder phase in total,
  • the cemented carbide contains 1.8% by volume or more and 20% by volume or less of the binder phase,
  • the binder phase contains 80% by mass or more of cobalt,
  • the cemented carbide includes a first region within 15 ⁇ m from the surface and a second region more than 15 ⁇ m from the surface;
  • the ratio R1/R2 may be 1.2 or more and 1.5 or less. This improves the balance between the deformation resistance and strength of the binder phase of the cemented carbide, and a cutting tool including the cemented carbide can have a longer tool life.
  • the binder phase may further contain at least one first element selected from the group consisting of silicon, phosphorus, germanium, tin, rhenium, ruthenium, osmium, iridium, and platinum. This improves the balance between the deformation resistance and strength of the binder phase of the cemented carbide, and allows a cutting tool including the cemented carbide to have a longer tool life.
  • the percentage of the mass M1 of the first element relative to the sum M1+M2 of the mass M1 of the first element and the mass M2 of cobalt, ⁇ M1/(M1+M2) ⁇ 100, may be 1% or more and 6% or less.
  • the binder phase can have both superior hardness and superior toughness, so that a cutting tool including a cemented carbide containing the binder phase can have a longer tool life.
  • the cutting tool of the present disclosure is a cutting tool having a cutting edge made of the cemented carbide alloy described in any one of (1) to (4) above.
  • a ⁇ B means the upper and lower limits of a range (i.e., greater than or equal to A and less than or equal to B). If no unit is stated for A and only a unit is stated for B, the units of A and B are the same.
  • any one numerical value listed as the lower limit and any one numerical value listed as the upper limit is also considered to be disclosed.
  • a1 or more, b1 or more, and c1 or more are listed as the lower limit and a2 or less, b2 or less, and c2 or less are listed as the upper limit, a1 or more and a2 or less, a1 or more and b2 or less, a1 or more and c2 or less, b1 or more and a2 or less, b1 or more and b2 or less, b1 or more and c2 or less, c1 or more and a2 or less, c1 or more and b2 or less, and c1 or more and c2 or less are considered to be disclosed.
  • the cemented carbide 3 according to one embodiment of the present disclosure (hereinafter also referred to as “embodiment 1”) is A cemented carbide (3) comprising a plurality of tungsten carbide particles (1) and a binder phase (2), The cemented carbide 3 contains tungsten carbide particles 1 and a binder phase 2 in a total amount of 89 volume % or more, The cemented carbide 3 contains a binder phase 2 of 1.8 volume % or more and 20 volume % or less, The binder phase 2 contains 80% by mass or more of cobalt, The cemented carbide 3 includes a first region having a distance of 15 ⁇ m or less from the surface and a second region having a distance of more than 15 ⁇ m from the surface, The ratio R1 of the area S1 (hcp) of the cobalt having hcp structure in the binder phase 2 of the first region
  • the cemented carbide of embodiment 1 can provide a cemented carbide that enables a longer tool life, even when used as a material for cutting tools for intermittent machining of high-hardness materials, and a cutting tool equipped with the same. The reason for this is not clear, but is presumed to be as follows.
  • the cemented carbide of the first embodiment comprises a plurality of tungsten carbide particles (hereinafter also referred to as "WC particles") and a binder phase, and the total content of the WC particles and binder phase in the cemented carbide is 89 volume % or more.
  • WC particles tungsten carbide particles
  • the cemented carbide has high hardness and strength, and a cutting tool comprising the cemented carbide can have excellent wear resistance and chipping resistance.
  • the cemented carbide of embodiment 1 contains a binder phase of 1.8 volume % or more and 20 volume % or less, and the binder phase contains 80 mass % or more of cobalt.
  • the cemented carbide has high hardness and strength, and a cutting tool including the cemented carbide can have excellent wear resistance and chipping resistance.
  • the ratio R1 of the area S1 (hcp) of the cobalt having hcp structure in the binder phase of the first region to the total area S1 (hcp ) of the cobalt having fcc structure and the ratio R2 of the area S2 (hcp) of the cobalt having hcp structure in the binder phase of the second region to the total area S2 (hcp ) of the cobalt having fcc structure in the binder phase of the second region is 1.8 or less.
  • the ratio of the hcp structure in the binder phase of the first region on the surface side of the cemented carbide is larger than that of the second region on the inner side of the cemented carbide, so that the deformation resistance of the binder phase on the surface side of the cemented carbide is improved.
  • the cutting tool equipped with the cemented carbide improves the plastic deformation resistance at the beginning of cutting.
  • a cutting tool including the cemented carbide can have excellent fatigue strength even when the inside of the cemented carbide is exposed during cutting.
  • the cemented carbide of embodiment 1 has an improved balance between the deformation resistance and strength of the binder phase, and a cutting tool including the cemented carbide has improved fracture resistance during high-load machining such as interrupted machining of high-hardness materials, and can have a long tool life.
  • the cemented carbide of the first embodiment contains tungsten carbide particles and a binder phase in a total amount of 89% or more by volume. This can increase the hardness of the cemented carbide.
  • the cemented carbide may contain tungsten carbide particles and a binder phase in a total amount of 89% to 100% by volume, 90% to 100% by volume, 91% to 100% by volume, or 92% to 100% by volume.
  • the cemented carbide of embodiment 1 contains 1.8 volume % or more and 20 volume % or less of a binder phase. This allows the hardness and toughness of the cemented carbide to be increased.
  • the content of the binder phase in the cemented carbide may be 2.0 volume % or more and 19.0 volume % or less, 3.0 volume % or more and 18.0 volume % or less, or 4.0 volume % or more and 17.0 volume % or less.
  • the cemented carbide of embodiment 1 can be composed of a plurality of tungsten carbide particles and a binder phase.
  • the cemented carbide can contain impurities to the extent that the effect of the present disclosure is not impaired.
  • the cemented carbide may contain other phases (not shown) in addition to the tungsten carbide particles and the binder phase.
  • the other phases may include carbides, nitrides or carbonitrides containing at least one element selected from the group consisting of titanium (Ti), tantalum (Ta), niobium (Nb), zirconium (Zr), hafnium (Hf) and molybdenum (Mo).
  • the composition of the other phases may be, for example, at least one selected from the group consisting of TiCN, TaC, NbC, ZrC, HfC , Cr3C2 and Mo2C .
  • the cemented carbide of embodiment 1 can be composed of tungsten carbide particles, a binder phase, and other phases.
  • the cemented carbide can contain impurities to the extent that the effects of the present disclosure are not impaired.
  • the content of other phases in the cemented carbide is permissible within a range that does not impair the effects of the present disclosure.
  • the content of other phases in the cemented carbide may be 0 vol.% or more and 11 vol.% or less, more than 0 vol.% and 11 vol.% or less, more than 0 vol.% and 7 vol.% or less, or more than 0 vol.% and 4 vol.% or less.
  • the cemented carbide of the first embodiment may contain impurities.
  • impurities include iron (Fe), calcium (Ca), silicon (Si), and sulfur (S).
  • the impurity content of the cemented carbide is acceptable within a range that does not impair the effects of the present disclosure.
  • the impurity content of the cemented carbide may be 0 mass% or more and less than 0.1 mass%.
  • the impurity content of the cemented carbide is measured by ICP optical emission spectroscopy (Inductively Coupled Plasma Emission Spectroscopy). The measuring device that can be used is Shimadzu Corporation's "ICPS-8100" (trademark).
  • the tungsten carbide particle content of the cemented carbide of embodiment 1 may be 67% by volume or more and 98.2% by volume or less, 70% by volume or more and 97% by volume or less, or 75% by volume or more and 96% by volume or less.
  • the method for measuring the tungsten carbide particle content (volume %) of the cemented carbide and the binder phase content (volume %) of the cemented carbide is as follows.
  • the mirror-finished surface of the cemented carbide is photographed with a scanning electron microscope (SEM) to obtain a backscattered electron image.
  • the photographed area is set to the center of the cross section of the cemented carbide, that is, a position that does not include areas with properties that are clearly different from the bulk part, such as near the surface of the cemented carbide (a position where the entire photographed area is the bulk part of the cemented carbide).
  • the observation magnification is 5000x.
  • the measurement conditions are an acceleration voltage of 3 kV, a current value of 2 nA, and a working distance (WD) of 5 mm.
  • (H1) The measurement of (G1) above is performed in five different non-overlapping measurement fields.
  • the average of the area percentages of tungsten carbide particles in the five measurement fields corresponds to the content (volume %) of tungsten carbide particles in the cemented carbide
  • the average of the area percentages of the binder phase in the five measurement fields corresponds to the content (volume %) of the binder phase in the cemented carbide.
  • the content of the other phases in the cemented carbide can be obtained by subtracting the content (volume %) of the tungsten carbide grains and the content (volume %) of the binder phase measured by the above procedure from the total cemented carbide (100 volume %).
  • the cemented carbide of embodiment 1 may contain 1% by mass or more of cobalt.
  • the cobalt content of the cemented carbide may be 1.0% by mass or more and 20% by mass or less, 2.0% by mass or more and 15% by mass or less, or 3.0% by mass or more and 12% by mass or less.
  • the method for measuring the cobalt content of the cemented carbide is as follows. Using the same method as (A1) to (D1) of the method for measuring the tungsten carbide particle content and binder phase content of the cemented carbide, an element mapping image is obtained by performing analysis using SEM-EDX. Based on the element mapping image, the cobalt region in the cemented carbide is identified and the cobalt content is measured. The measurement is performed in five different, non-overlapping imaging regions. In the present disclosure, the average of the cobalt content in the five imaging regions corresponds to the cobalt content of the cemented carbide.
  • the tungsten carbide particles include at least one of "pure WC particles (including WC containing no impurity elements and WC containing impurity elements below the detection limit)" and "WC particles containing impurity elements intentionally or unavoidably, as long as the effect of the present disclosure is not impaired.”
  • the impurity content of the tungsten carbide particles (when the impurity elements are two or more types, the total concentration of the elements) is less than 0.1 mass%.
  • the impurity element content of the tungsten carbide particles is measured by ICP emission spectrometry.
  • the average particle size of the tungsten carbide particles is not particularly limited.
  • the average particle size of the tungsten carbide particles can be, for example, 0.1 ⁇ m or more and 3.5 ⁇ m or less. It has been confirmed that the cemented carbide of the first embodiment enables the tool to have a longer life when used as a material for cutting tools, regardless of the average particle size of the tungsten carbide particles.
  • the binder phase contains 80% by mass or more of cobalt. This allows the cemented carbide to have excellent toughness.
  • the cobalt content of the binder phase may be 80% by mass or more and 100% by mass or less, 80% by mass or more and less than 100% by mass, or 90% by mass or more and less than 100% by mass.
  • the method for measuring the cobalt content of the binder phase is as follows.
  • An element mapping image and an image after binarization are obtained by the same method as (A1) to (E1) of the above-mentioned method for measuring the tungsten carbide particle content and binder phase content of the cemented carbide.
  • the element mapping image and the image after binarization are superimposed to identify the region in which the binder phase exists in the element mapping image.
  • a rectangular measurement field of view of 24.9 ⁇ m ⁇ 18.8 ⁇ m is set in the element mapping image.
  • the cobalt content is measured in the region in which the binder phase exists in the measurement field.
  • the above measurement is performed in five different measurement fields that do not overlap each other.
  • the average of the cobalt contents in the regions in which the binder phase exists in the five measurement fields corresponds to the cobalt content of the binder phase.
  • the binder phase may further contain at least one first element selected from the group consisting of silicon, phosphorus, germanium, tin, rhenium, ruthenium, osmium, iridium, and platinum. This improves the deformation resistance of the binder phase.
  • the inclusion of the first element in the binder phase is confirmed by the following procedure.
  • An element mapping image and an image after binarization are obtained by the same method as (A1) to (E1) of the above-mentioned method for measuring the tungsten carbide particle content and binder phase content of cemented carbide.
  • the region in which the binder phase exists is identified in the element mapping image. If the first element is present in the region in which the binder phase exists in the element mapping, it is confirmed that the binder phase contains the first element.
  • the percentage ⁇ M1/(M1+M2) ⁇ 100 of the mass of the first element M1 relative to the sum M1+M2 of the mass of the first element M1 and the mass of cobalt M2 may be 1% or more and 6% or less.
  • the units of M1 and M2 are the same.
  • the binder phase can have both better hardness and better toughness, so that a cutting tool including a cemented carbide containing the binder phase can have a longer tool life.
  • the mass M1 of the first element means the total mass of all types of first elements when the binder phase contains two or more types of first elements.
  • the percentage ⁇ M1/(M1+M2) ⁇ 100 may be 2% or more and 5% or less, or 3% or more and 4% or less.
  • the method for measuring the percentage ⁇ M1/(M1+M2) ⁇ x 100 is as follows.
  • An element mapping image and an image after binarization are obtained by the same method as (A1) to (E1) of the method for measuring the tungsten carbide particle content and binder phase content of the cemented carbide.
  • the element mapping image and the image after binarization are superimposed to identify the region in which the binder phase exists in the element mapping image.
  • a rectangular measurement field of view of 24.9 ⁇ m x 18.8 ⁇ m is set in the element mapping image.
  • the percentage ⁇ m1/(m1+m2) ⁇ x 100 of the mass m1 of the first element relative to the sum m1+m2 of the mass m1 of the first element and the mass m2 of cobalt is calculated.
  • the above measurement is performed in five different measurement fields that do not overlap with each other.
  • the average of the percentage ⁇ m1/(m1+m2) ⁇ x 100 in the five measurement fields corresponds to the "percentage ⁇ M1/(M1+M2) ⁇ x 100" in the binder phase of the cemented carbide.
  • the binder phase can contain, in addition to cobalt and the first element, at least one second element selected from the group consisting of iron, nickel, and chromium.
  • the binder phase can consist of cobalt, the first element, and the second element.
  • the binder phase can consist of cobalt, the first element, the second element, and unavoidable impurities. Examples of the unavoidable impurities include iron, nickel, and sulfur.
  • the cemented carbide of embodiment 1 comprises a first region that is within 15 ⁇ m from the surface, and a second region that is more than 15 ⁇ m from the surface, and the ratio R1 of the area S1 (hcp) of the cobalt having hcp (hexagonal close-packed) structure in the binder phase of the first region to the total area S1 ( hcp) of the cobalt having fcc (face-centered cubic) structure, and the ratio R2 of the area S2 (hcp) of the cobalt having hcp structure in the binder phase of the second region to the total area S2 (hcp) of the cobalt having fcc structure, is 1.8 or less.
  • the ratio R1 is expressed as S1 (hcp) /(S1 (hcp) +S1 (fcc) ), and the ratio R2 is expressed as S2 (hcp) /(S2 (hcp) +S2 (fcc ).
  • the units of area S1 (hcp) , area S1 (fcc) , area S2 (hcp) and area S2 (fcc) are the same.
  • R1/R2 may be 1.2 or more and 1.8 or less, 1.2 or more and 1.7 or less, 1.2 or more and 1.6 or less, 1.2 or more and 1.5 or less, 1.2 or more and 1.4 or less, or 1.2 or more and 1.3 or less.
  • R1 may be 0.5 or more and 1.0 or less, 0.6 or more and 0.9 or less, or 0.7 or more and 0.8 or less.
  • the cutting tool has improved resistance to plastic deformation in the early stages of cutting.
  • R2 may be 0.3 or more and 0.6 or less, 0.35 or more and 0.55 or less, or 0.4 or more and 0.5 or less. When the ratio R2 is 0.3 or more and 0.6 or less, the fatigue strength of the cutting tool is improved.
  • R1/R2 is measured according to the following procedure.
  • the cemented carbide is cut out along the normal to its main surface to expose the cross section. If the surface of the cemented carbide does not have a flat area, the cemented carbide is cut out from any point on the surface in a direction toward the center of gravity of the cemented carbide to expose the cross section.
  • the cross section is mirror-finished using a cross-section polisher (manufactured by JEOL Ltd.).
  • the mirror-finished surface of the cemented carbide is observed using a scanning electron microscope (SEM: Carl Zeiss Gemini450 (trademark)) equipped with an electron backscatter diffraction device (EBSD: Oxford Symmetry (trademark)).
  • SEM Carl Zeiss Gemini450
  • EBSD electron backscatter diffraction device
  • EBSD analysis is performed on the obtained observation image.
  • the observation image is acquired so as to include a region sandwiched between the surface of the cemented carbide and a virtual plane that is 50 ⁇ m away from the surface to the inside of the cemented carbide.
  • a first rectangular measurement field of view of 11.5 ⁇ m x 8.5 ⁇ m is set in a first region that is within a distance of 15 ⁇ m from the surface.
  • a second rectangular measurement field of view of 11.5 ⁇ m x 8.5 ⁇ m is set in a second region that is more than 15 ⁇ m away from the surface.
  • the observation magnification is 10,000 times.
  • the measurement conditions are: acceleration voltage 15 kV, current value 20 nA, 0.02 ⁇ m/step, exposure time 1.5 to 3 ms, and measurement time 10 to 20 minutes.
  • the above EBSD analysis results are analyzed using commercially available software (AZtecCrystal (trademark) manufactured by Oxford), and the crystal structure of the cobalt contained in the binder phase is identified in each of the first and second measurement fields, and a color map is obtained.
  • the crystal structure of the cobalt identified here is the crystal structure observed when the cobalt appearing on the mirror-finished surface of the cemented carbide is viewed in a planar view from the normal direction of the mirror-finished surface.
  • the above-mentioned ratio R is measured in three mutually non-overlapping first measurement fields and three mutually non-overlapping second measurement fields.
  • the average of the ratio R in the three first measurement fields corresponds to the ratio R1 of the area S1 (hcp) of the cobalt having hcp structure in the binder phase of the first region of the cemented carbide to the total area S1 (hcp) of the cobalt having fcc structure and the area S1 (fcc) of the cobalt having hcp structure.
  • the average of the ratio R in the three second measurement fields corresponds to the ratio R2 of the area S2 (hcp) of the cobalt having hcp structure in the binder phase of the second region of the cemented carbide to the total area S2 (hcp) of the cobalt having fcc structure and the area S2 (fcc) .
  • the cemented carbide of the first embodiment can be manufactured by carrying out the steps of preparing raw material powder, mixing, molding, and sintering in the above-mentioned order. Each step will be described below.
  • the preparation step is a step of preparing raw material powders of materials constituting the cemented carbide.
  • raw material powders include tungsten carbide powder (hereinafter also referred to as "WC powder"), cobalt (Co) powder, first element powder, and alloy powder of the first element and cobalt.
  • the first element powder include silicon (Si) powder, phosphorus (P) powder, germanium (Ge) powder, tin (Sn) powder, rhenium (Re) powder, ruthenium (Ru) powder, osmium (Os) powder, iridium (Ir) powder, and platinum (Pt) powder.
  • nickel (Ni) powder, niobium carbide (NbC) powder, tungsten carbide (TaC) powder, titanium carbonitride (TiCN) powder, chromium carbide (Cr 3 C 2 ) powder, and the like can be prepared. These raw material powders can be commercially available.
  • the average particle size of these raw material powders is not particularly limited and can be, for example, 0.5 to 2 ⁇ m.
  • the average particle size of the raw material powder means the average particle size measured by the FSSS (Fisher Sub-Sieve Sizer) method. The average particle size is measured using a "Sub-Sieve Sizer Model 95" (trademark) manufactured by Fisher Scientific.
  • the mixing step is a step of mixing the raw material powders prepared in the preparation step in a predetermined ratio.
  • a mixed powder in which the raw material powders are mixed is obtained by the mixing step.
  • the mixing ratio of the raw material powders is appropriately adjusted depending on the composition of the target cemented carbide.
  • the raw material powders can be mixed using conventional mixing methods such as an attritor, ball mill, or bead mill. Conventional mixing conditions can also be used.
  • the mixing time can be, for example, 2 hours or more and 20 hours or less.
  • the mixed powder may be granulated as necessary. Granulating the mixed powder makes it easier to fill the mixed powder into a die or mold during the molding step described below.
  • a known granulation method can be used for granulation, and for example, a commercially available granulator such as a spray dryer can be used.
  • the molding step is a step of molding the mixed powder obtained in the mixing step into a shape for a cutting tool to obtain a molded body.
  • the molding method and molding conditions in the molding step are not particularly limited and may be general methods and conditions.
  • the sintering step is a step of sintering the compact obtained in the compacting step to obtain a cemented carbide intermediate body.
  • the sintering conditions are as follows: The compact is placed in a sintering furnace and held at 7 MPa and 1360° C. for 2 hours.
  • the cooling step is a step of cooling the cemented carbide intermediate body after the sintering step. Specifically, the cemented carbide intermediate body is released from the sintering furnace into the air and rapidly cooled to room temperature at a temperature drop rate of ⁇ 100° C./min to obtain the cemented carbide of the first embodiment.
  • the sintering step is carried out by holding the cemented carbide intermediate body under the conditions of 7 MPa and 1360°C for 2 hours.
  • rapid cooling is carried out at a temperature drop rate of -100°C/min. This cooling rate is higher than the conventional cooling rate.
  • the cemented carbide of the first embodiment can be produced in which the ratio R1 of the area S1 (hcp) to the sum of the area S1 (hcp ) of the cobalt having the hcp structure and the area S1 (fcc ) of the cobalt having the fcc structure in the binder phase of the first region of the cemented carbide, and the ratio R2 of the area S2 (hcp ) to the sum of the area S2 (hcp) of the cobalt having the hcp structure and the area S2 (fcc) of the cobalt having the fcc structure in the binder phase of the second region, is 1.8 or less.
  • the inventors have found, through extensive research, that the cemented carbide of the present disclosure can be realized by employing such a sintering step and cooling step.
  • a cutting tool according to an embodiment of the present disclosure includes a cutting edge made of the cemented carbide of embodiment 1.
  • the cutting edge refers to a portion involved in cutting. More specifically, the cutting edge refers to a region surrounded by a cutting edge ridge and a virtual surface that is 0.5 mm or 2 mm away from the cutting edge ridge toward the cemented carbide side.
  • Cutting tools include, for example, cutting tools, drills, end mills, indexable cutting tips for milling, indexable cutting tips for turning, metal saws, gear cutting tools, reamers, taps, etc.
  • the cutting tool 10 of the second embodiment can exhibit excellent effects, particularly in the case of an end mill.
  • the cutting edge 11 of the cutting tool 10 shown in FIG. 2 is made of the cemented carbide of the first embodiment.
  • the cemented carbide of embodiment 1 may constitute the entire tool or may constitute only a part of the tool.
  • "constitute a part” refers to a mode in which the cemented carbide of embodiment 1 is brazed to a predetermined position of any substrate to form a cutting edge.
  • the cutting tool of the second embodiment may further include a hard film that covers at least a portion of the surface of the substrate made of cemented carbide.
  • the hard film may be made of, for example, diamond-like carbon or diamond.
  • the cutting tool of embodiment 2 can be obtained by forming the cemented carbide of embodiment 1 into a desired shape.
  • silicon (Si) powder (average particle size: 1 ⁇ m), phosphorus (P) powder (average particle size: 1 ⁇ m), germanium (Ge) powder (average particle size: 1 ⁇ m), tin (Sn) powder (average particle size: 1 ⁇ m), rhenium (Re) powder (average particle size: 1 ⁇ m), ruthenium (Ru) powder (average particle size: 1 ⁇ m), osmium (Os) powder (average particle size: 1 ⁇ m), iridium (Ir) powder (average particle size: 1 ⁇ m), and platinum (Pt) powder (average particle size: 1 ⁇ m) were prepared.
  • ⁇ Mixing step> A mixed powder was obtained by mixing the raw material powders for 10 hours using an attritor in the ratios shown in Table 1.
  • the ratio (mass %) of each raw material powder shown in Table 1 is the ratio when the total mixed powder is taken as 100 mass %.
  • the cemented carbide and cutting tools of Samples 1 to 19 correspond to Examples.
  • the cemented carbide and cutting tools of Samples 101 to 106 correspond to Comparative Examples. It was confirmed that the cutting tools of Samples 1 to 19 had longer tool lives than the cutting tools of Samples 101 to 106.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Powder Metallurgy (AREA)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD1094492S1 (en) * 2020-06-24 2025-09-23 Sumitomo Electric Hardmetal Corp. Cutting tool

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004131769A (ja) 2002-10-09 2004-04-30 Toshiba Tungaloy Co Ltd 超微粒超硬合金
JP2013111711A (ja) * 2011-11-29 2013-06-10 Mitsubishi Materials Corp 靭性と耐摩耗性に優れたダイヤモンド被覆超硬合金製切削工具
JP2019063932A (ja) * 2017-09-29 2019-04-25 三菱マテリアル株式会社 耐溶着チッピング性にすぐれた切削工具
JP2019063937A (ja) * 2017-09-29 2019-04-25 三菱マテリアル株式会社 耐溶着チッピング性にすぐれた表面被覆切削工具
KR20220023554A (ko) * 2020-08-21 2022-03-02 한국야금 주식회사 절삭공구용 초경합금
JP2022079855A (ja) * 2020-11-17 2022-05-27 Ｍｍｃリョウテック株式会社 超硬合金工具

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004131769A (ja) 2002-10-09 2004-04-30 Toshiba Tungaloy Co Ltd 超微粒超硬合金
JP2013111711A (ja) * 2011-11-29 2013-06-10 Mitsubishi Materials Corp 靭性と耐摩耗性に優れたダイヤモンド被覆超硬合金製切削工具
JP2019063932A (ja) * 2017-09-29 2019-04-25 三菱マテリアル株式会社 耐溶着チッピング性にすぐれた切削工具
JP2019063937A (ja) * 2017-09-29 2019-04-25 三菱マテリアル株式会社 耐溶着チッピング性にすぐれた表面被覆切削工具
KR20220023554A (ko) * 2020-08-21 2022-03-02 한국야금 주식회사 절삭공구용 초경합금
JP2022079855A (ja) * 2020-11-17 2022-05-27 Ｍｍｃリョウテック株式会社 超硬合金工具

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD1094492S1 (en) * 2020-06-24 2025-09-23 Sumitomo Electric Hardmetal Corp. Cutting tool

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