WO2024014412A1 - サーメット焼結体、サーメット工具および切削工具 - Google Patents

サーメット焼結体、サーメット工具および切削工具 Download PDF

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Publication number
WO2024014412A1
WO2024014412A1 PCT/JP2023/025287 JP2023025287W WO2024014412A1 WO 2024014412 A1 WO2024014412 A1 WO 2024014412A1 JP 2023025287 W JP2023025287 W JP 2023025287W WO 2024014412 A1 WO2024014412 A1 WO 2024014412A1
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Prior art keywords
hard phase
area
sample
cermet
region
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PCT/JP2023/025287
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English (en)
French (fr)
Japanese (ja)
Inventor
涼馬 野見山
綾乃 根岸
勇一郎 熊
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Kyocera Corp
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Kyocera Corp
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Priority to JP2024533693A priority Critical patent/JP7808196B2/ja
Priority to CN202380046225.8A priority patent/CN119278284A/zh
Publication of WO2024014412A1 publication Critical patent/WO2024014412A1/ja
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
    • 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
    • C22C29/04—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 carbonitrides

Definitions

  • the present disclosure relates to a cermet sintered body, a cermet tool, and a cutting tool.
  • Cermet sintered bodies containing titanium (Ti) as the main component are widely used as substrates for parts that require wear resistance, sliding properties, and chipping resistance, such as cutting tools, wear-resistant parts, and sliding parts. ing.
  • a cermet sintered body includes a first hard phase mainly composed of TiCN and a composite carbonitride solid solution of Ti and at least one metal of Groups 4, 5, and 6 of the periodic table. 2 hard phases, and a binder phase containing at least one of Co and Ni and W.
  • the average particle diameter d 2in of the second hard phase in the internal region and the average particle diameter d 2sf of the second hard phase in the surface region are both 0.35 ⁇ m or more and 0.6 ⁇ m or less.
  • the intensity ⁇ 1 in the surface region and the intensity ⁇ 2 in the internal region are both 2300 MPa or more, and the intensity ratio of ⁇ 1 to ⁇ 2 ( ⁇ 1/ ⁇ 2) is 0.8 or more.
  • FIG. 1 is a perspective view showing an example of a cermet tool according to an embodiment.
  • FIG. 2 is a side sectional view showing an example of the cermet tool according to the embodiment.
  • FIG. 3 is a copy of a scanning electron micrograph of a cross section of a cermet sintered body.
  • FIG. 4 is a front view showing an example of the cutting tool according to the embodiment.
  • FIG. 5 shows sample No. 1, which is a comparative example. 1 and sample No. 1 which is an example. 3 is a graph showing the anti-resistance strength in the surface area and the internal area for No. 3.
  • FIG. 6 shows sample No. 1, which is a comparative example. 1 and sample No. 1 which is an example. 3 is a graph showing the thermal shock strength of No. 3.
  • FIG. 1 is a perspective view showing an example of a cermet tool according to an embodiment.
  • FIG. 2 is a side sectional view showing an example of the cermet tool according to the embodiment.
  • FIG. 3 is a copy of a scanning electron micrograph of a cross section of a cermet sintered body.
  • the cermet tool 1 As shown in FIGS. 1 and 2, the cermet tool 1 according to the embodiment includes a base body 2 and a coating layer 3.
  • the base 2 has, for example, a hexahedral shape in which the top and bottom surfaces (the surfaces intersecting the Z-axis shown in FIG. 1) are parallelograms.
  • the cutting edge has a first surface and a second surface connected to the first surface.
  • the first surface is, for example, the upper surface of the base 2.
  • the second surface is, for example, a side surface of the base body 2.
  • the first surface functions as a "rake surface” that scoops up chips generated by cutting
  • the second surface functions as a "relief surface.”
  • a cutting blade is located on at least a portion of the ridgeline where the first surface and the second surface intersect, and the cermet tool 1 cuts the workpiece by applying the cutting blade to the workpiece.
  • a through hole 21 that vertically penetrates the base 2 may be located in the center of the base 2.
  • a screw 75 for attaching the cermet tool 1 to a holder 70, which will be described later, is inserted into the through hole 21 (see FIG. 4).
  • the base body 2 is made of a cermet sintered body.
  • the cermet sintered body contains Ti (titanium) and W (tungsten), and also contains at least one of Co (cobalt) and Ni (nickel).
  • the base body 2 which is a cermet sintered body, contains a hard phase 5 and a bonding phase 6.
  • the substrate 2 is formed by solid solution of TiCN and at least a portion of carbides, nitrides, and carbonitrides of at least one metal of Groups 4, 5, and 6 of the periodic table other than Ti.
  • a hard phase 5 is bonded with a bonding phase 6.
  • the bonded phase 6 contains W and at least one of Co and Ni.
  • the first hard phase is a hard phase containing TiCN as a main component.
  • main component refers to, for example, 55% by mass or more when the entire hard phase of the constituent components is 100% by mass.
  • the first hard phase contains 80% by weight or more of Ti as metal components, and 1% or more by weight of W and one or more metals from Groups 4, 5, and 6 of the periodic table. Contains less than %. Moreover, the first hard phase contains Co and/or Ni as the remainder.
  • the second hard phase is a hard phase made of a composite carbonitride solid solution of Ti and at least one metal of Groups 4, 5, and 6 of the periodic table. Specifically, the second hard phase contains Ti in a total amount of 30% or more and 70% by weight, W and one or more metals from Groups 4, 5, and 6 of the periodic table in a total amount of 70% or more and 30% by weight. % or less, and the total amount of binder phase metals such as Co and/or Ni is 0% or more and 3% or less by weight.
  • the first hard phase 5a is relatively smaller than the second hard phase 5b.
  • the second hard phase 5b is observed to be black, and the second hard phase 5b is relatively grayer than the first hard phase 5a.
  • the second hard phase 5b also includes a double cored structure in which the first hard phase 5a is the core and the second hard phase 5b is the peripheral part. Note that it is not necessary that all the second hard phases 5b have a cored structure.
  • a region centered at a depth of 10 ⁇ m from the surface of the base 2 is defined as the base 2, in other words, the surface region of the cermet sintered body.
  • the width of the surface region in the depth direction of the base body 2 may be, for example, 20 ⁇ m.
  • a region centered at an arbitrary position 0.4 mm or more deep from the surface of the base 2 is defined as an internal region of the base 2.
  • the width of the internal region in the depth direction of the base body 2 may be, for example, 20 ⁇ m.
  • the average particle diameter d 2in of the second hard phase 5b in the internal region and the average particle diameter d 2sf of the second hard phase 5b in the surface region are both 0.35 ⁇ m or more and 0.6 ⁇ m. It is as follows. Further, the area ratio S 2in of the second hard phase 5b to the entire hard phase in the internal region and the area ratio S 2sf of the second hard phase 5b to the entire hard phase in the surface area are both 50 area % or more and 80 area %. It is as follows.
  • the intensity ⁇ 1 in the surface region and the intensity ⁇ 2 in the inner region are both 2300 MPa or more, and the intensity ratio ( ⁇ 1/ ⁇ 2) of the intensity ⁇ 1 in the surface region to the intensity ⁇ 2 in the inner region is 0.8 That's all.
  • the average particle diameter d 1in of the first hard phase 5a in the internal region and the average particle diameter d 1sf of the first hard phase 5a in the surface region are both 0.25 ⁇ m or more and 0.35 ⁇ m. It may be the following. Further, the average particle diameter d 1in of the first hard phase 5a in the internal region and the average particle diameter d 1sf of the first hard phase 5a in the surface region may both be 0.25 ⁇ m or more and 0.3 ⁇ m or less. .
  • the area ratio S 1in of the first hard phase 5a to the entire hard phase in the internal region and the area ratio S 1sf of the first hard phase 5a to the entire hard phase in the surface area are both 20 area % or more and 35 area %. It may be the following.
  • the average grain size d 1sf and area ratio S 1sf of the first hard phase 5a in the surface region are the same as the average grain size d 1in and area ratio S 1in of the first hard phase 5a in the inner region.
  • the thermal shock resistance on the surface can be improved to the same extent as the thermal shock resistance on the inside.
  • the hardness H1 in the surface region and the hardness H2 in the internal region may both be 1450 HV or more.
  • of the difference between the hardness H1 in the surface region and the hardness H2 in the internal region may be 50 or less.
  • the hardness H1 in the surface region is approximately the same as the hardness H2 in the internal region, so that the thermal shock resistance at the surface can be increased to the same extent as the thermal shock resistance inside.
  • the coating layer 3 is coated on the base body 2 for the purpose of improving the wear resistance, heat resistance, etc. of the base body 2, for example.
  • FIG. 2 shows an example in which the coating layer 3 covers the entire surface of the base 2, the coating layer 3 does not necessarily need to cover the entire surface of the base 2.
  • the covering layer 3 only needs to be located on at least a portion of the surface of the base 2.
  • the coating layer 3 is located on the first surface, here the upper surface, of the base body 2, the first surface has high wear resistance and heat resistance.
  • the coating layer 3 is located on the second surface of the base body 2, in this case on the side surface, the second surface has high wear resistance and heat resistance.
  • the coating layer 3 is made of, for example, at least one metal element selected from Group 4, 5, and 6 elements of the periodic table, Al (aluminum), and Si (silicon), and C (carbon), N (nitrogen), and O. (oxygen). With such a configuration, the oxidation resistance of the coating layer 3 is improved. This further improves the wear resistance of the coating layer 3.
  • the covering layer 3 may be one layer.
  • the cermet tool 1 may have the coating layer 3 laminated in a layered manner, that is, two or more layers.
  • the average particle size (d 1in , d 2in , d 1sf , d 2sf ) and the area ratio (S 1in , S 2in , S 1sf , S 2sf ) can be determined, for example, by the following procedure.
  • a cross section of the cermet sintered body is photographed with a scanning electron microscope (SEM) at a magnification of 10,000 times to obtain a backscattered electron image.
  • a region including a position at a depth of 10 ⁇ m from the surface of the cermet sintered body is defined as a surface region, and a region including a position at a depth of 400 ⁇ m from the surface of the cermet sintered body is defined as an internal region.
  • draw a straight line with a length of 10 ⁇ m in the direction parallel to the surface of the cermet sintered body and calculate each phase from the length of the line segment that crosses the first hard phase and the length of the line segment that crosses the second hard phase.
  • the diameter, specifically the particle diameter and abundance ratio, specifically the area ratio may be determined.
  • the average particle diameter of the first hard phase may be calculated by dividing the total length of line segments that cross the first hard phase by the number of first hard phases that the line crosses.
  • the average particle diameter of the second hard phase may be calculated by dividing the total length of line segments that cross the second hard phase by the number of second hard phases that the line crosses.
  • the average particle size of the first hard phase and the second hard phase particles smaller than a specific value may be excluded from the target in order to avoid measurement variations. For example, if 0.1 ⁇ m is set as a specific value, and the first hard phase whose line segment is 0.1 ⁇ m or more is the first measurement target, the total length of the line segments in this first measurement target is the line The average particle size of the first hard phase may be calculated by dividing by the number of first measurement objects crossed by the first measurement target. Similarly, if the second hard phase whose line segment is 0.1 ⁇ m or more is the second measurement target, the total length of the line segments in this second measurement target is the number of second measurement targets crossed by the line. By dividing, the average particle size of the second hard phase may be calculated.
  • the length of the line segment that crosses the first hard phase when the sum of the length of the line segment that crosses the first hard phase and the total length of the line segment that crosses the second hard phase is taken as 100%.
  • the total ratio may be calculated as the area ratio of the first hard phase.
  • the length of the line segment that crosses the second hard phase when the sum of the lengths of the line segments that cross the first hard phase and the total length of the line segments that cross the second hard phase is taken as 100%.
  • the total ratio of the hard phase may be calculated as the area ratio of the second hard phase.
  • the bonded phase region is excluded.
  • the measurement may preferably be performed by measuring three visual fields and taking the average thereof. It can also be measured using a commercially available image analysis device.
  • TiCN powder is utilized.
  • This TiCN raw material powder may be one that is generally used in the production of cermets.
  • the TiCN raw material powder may have already undergone a pulverization process. Furthermore, if the TiCN raw material powder has not undergone a pulverization process, it may be pulverized using a rotary mill and media.
  • TiCN raw material powder having such dislocations, carbides of the metals mentioned above, and Co or Ni as the binder phase as raw materials.
  • a raw material powder of TiCN having dislocations may be used, and the binder phase components such as Co and Ni may be 14% by mass or more and 22% by mass or less.
  • the binder phase component is within the above range, the cermet that is the base has high toughness and high hardness.
  • the firing step may be, for example, the following steps.
  • (a) Step of raising the temperature from room temperature to 1100°C in vacuum (b) Holding the temperature at 1100°C in vacuum for 1 to 2.5 hours (c) Injecting N2 gas into the firing furnace at 1100°C and changing the pressure inside the firing furnace to pressure P1, which is 5 Pa, and then increasing the temperature from 1100°C to temperature T1 of 1150 to 1300°C at a heating rate r1 of 0.1 to 2°C/min (d ) Holding at temperature T1 for 0.5 to 2 hours (e) At temperature T1, change the pressure in the firing furnace to pressure P2, which is 300 to 2000 Pa higher than pressure P1, and then change from temperature T1 to 1300 to 2000 Pa.
  • temperature T3 Specifically, after 0.25 hours have passed, the pressure in the firing furnace is gradually reduced from P3 to 5 Pa while applying the pressure in the firing furnace for 0.25 hours. Thereafter, the pressure is maintained at 5 Pa for 0.5 hours.
  • the cermet sintered body of the present disclosure can be produced by firing a molded body having the above-described composition in the above-described firing process.
  • the coating layer 3 may be a so-called hard film, and may be formed by, for example, a PVD method or a CVD method.
  • the coating film may be a single layer or a laminated film.
  • FIG. 4 is a front view showing an example of the cutting tool according to the embodiment.
  • the cutting tool 100 includes a cermet tool 1 and a holder 70 for fixing the cermet tool 1.
  • the holder 70 is a rod-shaped member that extends from the first end toward the second end.
  • the first end is the top end in FIG. 4, and the second end is the bottom end in FIG.
  • the holder 70 is made of steel or cast iron, for example. In particular, it is preferable to use steel with high toughness among these members.
  • the holder 70 has a pocket 73 at the first end.
  • the pocket 73 is a portion on which the cermet tool 1 is mounted, and has a seating surface that intersects with the rotational direction of the workpiece and a restraining side surface that is inclined with respect to the seating surface.
  • the seating surface is provided with a screw hole into which a screw 75, which will be described later, is screwed.
  • the cermet tool 1 is located in the pocket 73 of the holder 70 and is attached to the holder 70 by a screw 75. That is, the screw 75 is inserted into the through hole 21 of the cermet tool 1, and the tip of the screw 75 is inserted into a screw hole formed in the seating surface of the pocket 73, so that the screw portions are screwed together. Thereby, the cermet tool 1 is attached to the holder 70 so that the cutting edge portion protrudes outward from the holder 70.
  • a cutting tool used for so-called turning is exemplified.
  • turning processing include inner diameter processing, outer diameter processing, and grooving.
  • the cutting tool is not limited to one used for turning.
  • the cermet tool 1 may be used as a cutting tool used for milling.
  • cutting tools used in milling include milling cutters such as flat milling cutters, face milling cutters, side milling cutters, and groove milling cutters, and end mills such as single-flute end mills, multi-flute end mills, tapered blade end mills, and ball end mills. .
  • Sample No. which is a cermet sintered body. 3 and no. No. 4 was manufactured using the manufacturing method described above.
  • Sample No. 3 and no. 4 is an example of the present disclosure.
  • sample No. 1 and no. 2 is a conventional cermet sintered body and is a comparative example.
  • Sample No. The average particle size of the first hard phase in Sample No. 1 was 0.22 ⁇ m in the surface region and 0.31 ⁇ m in the internal region.
  • Sample No. The average particle size of the first hard phase in No. 2 was 0.29 ⁇ m in the inner region.
  • Sample No. The average particle size of the first hard phase in Sample No. 3 was 0.29 ⁇ m in the surface region and 0.3 ⁇ m in the internal region.
  • Sample No. The average particle size of the first hard phase in Sample No. 4 was 0.26 ⁇ m in the surface region and 0.34 ⁇ m in the internal region.
  • Sample No. The area ratio of the first hard phase in Sample No. 1 was 12 area % in the surface area and 36.8 area % in the internal area.
  • Sample No. The area ratio of the first hard phase in No. 2 was 0 area % in the surface area and 4.3 area % in the internal area.
  • Sample No. The area ratio of the first hard phase in Sample No. 3 was 28.7 area % in the surface area and 30.1 area % in the internal area.
  • Sample No. The area ratio of the first hard phase in Sample No. 4 was 19 area % in the surface area and 51 area % in the internal area.
  • the ratio of the average particle size of the first hard phase in the surface area to the average particle size of the first hard phase in the internal area is as follows: Sample No. 1 is 0.7, sample No. 3 is 0.95, sample No. 4 was 0.76. The ratio is determined by surface average particle size/internal average particle size.
  • Sample No. The average particle size of the second hard phase in Sample No. 1 was 0.95 ⁇ m in the surface region and 0.48 ⁇ m in the internal region.
  • Sample No. The average particle size of the second hard phase in Sample No. 2 was 0.91 ⁇ m in the surface region and 0.85 ⁇ m in the internal region.
  • Sample No. The average particle size of the second hard phase in Sample No. 3 was 0.41 ⁇ m in the surface region and 0.51 ⁇ m in the internal region.
  • Sample No. The average particle size of the second hard phase in Sample No. 4 was 0.36 ⁇ m in the surface region and 0.58 ⁇ m in the internal region.
  • Sample No. The area ratio of the second hard phase in Sample No. 1 was 88 area % in the surface area and 63.2 area % in the internal area.
  • Sample No. The area ratio of the second hard phase in No. 2 was 100 area % in the surface area and 95.7 area % in the internal area.
  • Sample No. The area ratio of the second hard phase in No. 3 was 71.3 area % in the surface area and 69.9 area % in the internal area.
  • Sample No. The area ratio of the second hard phase in No. 4 was 81 area % in the surface area and 49 area % in the internal area.
  • the ratio of the average particle size of the second hard phase in the surface area to the average particle size of the second hard phase in the internal area is as follows: Sample No. 1 is 1.98, sample no. 2 is 1.07, sample No. 3 is 0.8, sample No. 4 was 0.62.
  • the average particle diameter of the entire hard phase including the first hard phase and the second hard phase is that of sample No.
  • Sample No. 1 was 0.64 ⁇ m in the surface region, 0.39 ⁇ m in the internal region, and sample No. Sample No. 2 was 0.91 ⁇ m in the surface region and 0.85 ⁇ m in the internal region.
  • Sample No. 3 was 0.36 ⁇ m in the surface region and 0.42 ⁇ m in the internal region.
  • 4 was 0.34 ⁇ m in the surface area and 0.46 ⁇ m in the internal area.
  • sample No. which is an example. 3 the area ratio S 2in of the second hard phase to the entire hard phase in the internal region and the area ratio S 2sf of the second hard phase to the entire hard phase in the surface area are both 50 area % or more and 80 area % or less. It is.
  • sample No. which is an example. 3 the area ratio S 1in of the first hard phase to the entire hard phase in the internal region and the area ratio S 1sf of the first hard phase to the entire hard phase in the surface area are both 20 area % or more and 35 area % or less. It is.
  • sample No. 3 and no. Sample No. 4 is a comparative example. 1, No. It can be seen that the second hard phase in the surface region is finer than that in Sample No. 2. After that, sample No. which is an example. 3 and no. Sample No. 4 is a comparative example. 1, No. It can be seen that compared to No. 2, the difference in particle size between the hard phase between the surface region and the internal region, specifically, the first hard phase and the second hard phase, is small.
  • thermal conductivity may be determined in accordance with JIS R 1611.
  • Young's modulus may be determined in accordance with ISO14577.
  • the coefficient of thermal expansion may be determined in accordance with JIS R 1618.
  • the hardness may be determined in accordance with JIS R 1610.
  • the anti-destructive strength may be determined in accordance with JIS R 1601.
  • a strength test piece was prepared as described below and used for the bending strength test of the surface region and internal region. Each surface of a rectangular parallelepiped sintered body of an internal strength test piece (dimensions: 4 mm * 5 mm * 40 mm) was ground by 0.5 mm.
  • a surface strength test piece (dimensions: 4 mm * 5 mm * 40 mm) was ground by 0.5 to 1 mm from each surface of the rectangular parallelepiped except for the tension surface. Furthermore, in order to have the same shape as the tool surface, the tension surface of each strength test piece was blasted and polished by several ⁇ m to 10 ⁇ m to produce a test piece of 3 mm * 4 mm * 40 mm.
  • thermal shock strength (R 1c ) was calculated from the obtained thermal conductivity ( ⁇ ), Young's modulus (E), thermal expansion coefficient ( ⁇ ), and anti-destructive strength ( ⁇ ).
  • ⁇ HV20 shown in Table 2 is the absolute value
  • HV20 means hardness when measured with a test force of 20 kgf.
  • the anti-destructive strength ⁇ 1 in the surface region was 2449 MPa
  • the anti-destructive strength ⁇ 2 in the internal region was 2512 MPa.
  • the strength ratio ( ⁇ 1/ ⁇ 2) of anti-analytical strength ⁇ 1 to anti-analytical strength ⁇ 2 was 0.97. Note that the anti-destructive strength ⁇ 1 is the surface strength, and the anti-destructive strength ⁇ 2 is the internal strength.
  • sample No. which is an example.
  • the anti-destructive strength ⁇ 1 in the surface region was 2450 MPa
  • the anti-destructive strength ⁇ 2 in the internal region was 2350 MPa
  • the strength ratio ( ⁇ 1/ ⁇ 2) of anti-analytical strength ⁇ 1 to anti-analytical strength ⁇ 2 was 1.04.
  • sample No. which is an example. 3 and no. 4 the anti-resistance strength ⁇ 1 in the surface region and the anti-resistance strength ⁇ 2 in the internal region are both 2300 MPa or more, and the strength ratio ( ⁇ 1/ ⁇ 2) of the anti-resistance strength ⁇ 1 to the anti-resistance strength ⁇ 2 is: It is 0.8 or more. From this result, sample No. which is an example. 3 and no. It can be seen that in No. 4, the strength in the inner region is relatively high, and the strength in the surface region is also as high as the strength in the inner region.
  • sample No. which is an example.
  • the hardness H1 in the surface region was 1531 HV20
  • the hardness H2 in the internal region was 1495 HV20
  • ⁇ HV20 was 36HV.
  • the hardness H1 in the surface region and the hardness H2 in the internal region are both 1450 HV or more, and the absolute value of the difference between the hardness H1 and the hardness H2
  • sample No. which is an example.
  • the hardness H1 in the surface region was 1560HV20
  • the hardness H2 in the internal region was 1450HV20
  • ⁇ HV20 was 110HV.
  • sample No. which is an example. No. 3 had a thermal shock strength of 9783 in the surface region and a thermal shock strength of 10105 in the internal region.
  • sample No. which is an example. No. 4 had a thermal shock strength of 9795 in the surface region and a thermal shock strength of 9549 in the internal region.
  • sample No., which is a comparative example. No. 1 had a thermal shock strength of 5922 in the surface region and a thermal shock strength of 10309 in the internal region.
  • sample No. 1, which is a comparative example. No. 2 had a thermal shock strength of 7970 in the surface region and a thermal shock strength of 8274 in the internal region. In this way, sample No. which is an example. 3 and no.
  • Sample No. 4 is a comparative example. 1 and no. It can be seen that the thermal shock strength in the surface region is improved compared to No. 2.
  • FIG. 5 shows sample No. 1, which is a comparative example. 1 and sample No. 1 which is an example. 3 is a graph showing the anti-resistance strength in the surface area and the internal area for No. 3.
  • the vertical axis represents the strength ratio when the anti-destructive strength in the internal region is taken as 100%.
  • FIG. 6 shows sample No. 6, which is a comparative example. 1 and sample No. 1 which is an example. 3 is a graph showing the thermal shock strength of No. 3.
  • sample No. The vertical axis shows the strength ratio when the thermal shock strength in the surface area of No. 1 is taken as 100%.
  • sample No. 1 which is an example, Sample No. 3 is a comparative example. It can be seen that the difference between the anti-destructive strength in the surface region and the anti-destructive strength in the internal region is small compared to No. 1.
  • sample No. 1 which is an example, Sample No. 3 is a comparative example. It can be seen that the thermal shock strength in the surface region is improved compared to No. 1.
  • sample No. which is an example. Sample No. 3 is a comparative example. It can be seen that the thermal shock strength in the surface area is approximately 1.65 times higher than that of No. 1.
  • the cermet sintered body according to the embodiment has a first hard phase (as an example, the first hard phase 5a) containing TiCN as a main component, and A bond containing a second hard phase (for example, second hard phase 5b) that is a composite carbonitride solid solution of at least one of Group 5 and 6 metals and Ti, at least one of Co and Ni, and W. phase (as an example, a bonded phase 6).
  • the average particle diameter d 2in of the second hard phase in the internal region and the average particle diameter d 2sf of the second hard phase in the surface region are both 0.35 ⁇ m or more and 0.6 ⁇ m or less.
  • the intensity ⁇ 1 in the surface region and the intensity ⁇ 2 in the internal region are both 2300 MPa or more, and the intensity ratio of ⁇ 1 to ⁇ 2 ( ⁇ 1/ ⁇ 2) is 0.8 or more.
  • the thermal shock resistance on the surface can be improved.
  • a cermet tool according to the present disclosure includes, for example, a rod-shaped main body having a rotating shaft and extending from a first end to a second end, a cutting blade located at the first end of the main body, and a second end of the main body from the cutting blade. It may have a groove extending spirally toward the side.
  • the use of the cermet sintered body according to the present disclosure is not limited to tools.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
PCT/JP2023/025287 2022-07-11 2023-07-07 サーメット焼結体、サーメット工具および切削工具 Ceased WO2024014412A1 (ja)

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CN202380046225.8A CN119278284A (zh) 2022-07-11 2023-07-07 金属陶瓷烧结体、金属陶瓷刀具以及切削刀具

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006111947A (ja) * 2004-10-18 2006-04-27 Tungaloy Corp 超微粒子サーメット
JP2016135906A (ja) * 2015-01-16 2016-07-28 住友電気工業株式会社 サーメット、切削工具、及びサーメットの製造方法
WO2017179657A1 (ja) * 2016-04-13 2017-10-19 京セラ株式会社 切削インサート及び切削工具
JP2019025559A (ja) * 2017-07-27 2019-02-21 京セラ株式会社 被覆工具、切削工具及び切削加工物の製造方法
WO2022085649A1 (ja) * 2020-10-21 2022-04-28 京セラ株式会社 サーメット製インサート及びこれを備えた切削工具

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006111947A (ja) * 2004-10-18 2006-04-27 Tungaloy Corp 超微粒子サーメット
JP2016135906A (ja) * 2015-01-16 2016-07-28 住友電気工業株式会社 サーメット、切削工具、及びサーメットの製造方法
WO2017179657A1 (ja) * 2016-04-13 2017-10-19 京セラ株式会社 切削インサート及び切削工具
JP2019025559A (ja) * 2017-07-27 2019-02-21 京セラ株式会社 被覆工具、切削工具及び切削加工物の製造方法
WO2022085649A1 (ja) * 2020-10-21 2022-04-28 京セラ株式会社 サーメット製インサート及びこれを備えた切削工具

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