WO2018124108A1 - Élément céramique et outil de coupe - Google Patents

Élément céramique et outil de coupe Download PDF

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Publication number
WO2018124108A1
WO2018124108A1 PCT/JP2017/046736 JP2017046736W WO2018124108A1 WO 2018124108 A1 WO2018124108 A1 WO 2018124108A1 JP 2017046736 W JP2017046736 W JP 2017046736W WO 2018124108 A1 WO2018124108 A1 WO 2018124108A1
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WO
WIPO (PCT)
Prior art keywords
particles
phase
cutting tool
ceramic member
particle
Prior art date
Application number
PCT/JP2017/046736
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English (en)
Japanese (ja)
Inventor
松田　尚久
Original Assignee
京セラ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京セラ株式会社 filed Critical 京セラ株式会社
Priority to JP2018559533A priority Critical patent/JP6913696B2/ja
Publication of WO2018124108A1 publication Critical patent/WO2018124108A1/fr

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Classifications

    • 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
    • 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
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/111—Fine ceramics
    • C04B35/117—Composites
    • 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
    • C04B35/56—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 carbides or oxycarbides

Definitions

  • This disclosure relates to a ceramic member used for a cutting tool.
  • Cutting tools are used in cutting.
  • this cutting tool as described in, for example, Patent Documents 1-3, a ceramic member containing alumina (Al 2 O 3 ) and tungsten carbide (WC) is used. It is also described that chromium carbide (for example, Cr 3 C, Cr 3 C 2 ) is contained. This chromium carbide is generally used for improving the corrosion resistance.
  • the ceramic member of the present disclosure has a plurality of first particles containing tungsten and carbon, and a plurality of second particles containing aluminum and oxygen, and at least one of the second particles is And third particles containing tungsten and carbon.
  • the cutting tool of this indication is provided with the above-mentioned ceramic member.
  • FIG. 2 is an A1-A1 cross-sectional view of the cutting tool shown in FIG. It is the figure which expanded a part of base
  • the ceramic member of one embodiment will be described in detail with reference to the drawings.
  • each drawing referred to below is a simplified illustration of only main members necessary for describing each embodiment for convenience of explanation. Accordingly, the ceramic member may include any constituent member that is not shown in each of the referenced drawings.
  • the dimension of the member in each figure does not represent the dimension of an actual structural member, the dimension ratio of each member, etc. faithfully.
  • a base 3 used for the cutting tool 1 is shown as an example of a ceramic member.
  • the cutting tool 1 in the present embodiment is an example of a cutting edge exchange type cutting insert that is used by being attached to a predetermined position at the tip of a holder (not shown).
  • the cutting tool 1 has a polygonal plate shape, and is located on at least a part of the first surface 5, the second surface 7 adjacent to the first surface 5, and the portion where the first surface 5 and the second surface 7 intersect. And a cutting edge 9.
  • the upper surface corresponds to the first surface 5, and the side surface corresponds to the second surface 7.
  • the cutting edge 9 is annular because it is located on the entire outer peripheral portion of the first surface 5.
  • the cutting tool 1 has a base plate 3 having a polygonal plate shape and a coating layer 11 positioned on the surface of the base 3.
  • the structure which does not have the coating layer 11 may be sufficient as the cutting tool 1.
  • the size of the cutting tool 1 is not particularly limited.
  • the length of one side of the first surface 5 is set to about 5 to 20 mm, and the first surface 5 is opposite to the first surface 5.
  • the height to the located surface (lower surface) is set to about 3 to 20 mm.
  • the thickness of the covering layer 11 is not particularly limited, but is set to 3 to 25 ⁇ m, for example. Since the thickness of the coating layer 11 with respect to the size of the cutting tool 1 is very small, the size of the base 3 is substantially the same as the size of the cutting tool 1.
  • FIGS. 2 Cross sections of the cutting tool 1 are shown in FIGS. 2 is a cross-sectional view taken along the line AA in FIG. 1, and is a cross-sectional view orthogonal to the first surface 5.
  • FIG. FIG. 3 is an enlarged view of a part of FIG.
  • FIG. 4 is an enlarged view of a part of FIG.
  • FIG. 3 shows only the first phase 13 with hatched lines
  • FIG. 4 shows the first phase 13 and second phase 15 with hatched lines. ing.
  • the first phase 13 includes a plurality of first particles 19.
  • the second phase 15 includes a plurality of second particles 21.
  • the boundary between the first particles 19 and the boundary between the second particles 21 are omitted in the figure.
  • the substrate 3 of the present disclosure has a first phase 13, a second phase 15, and a third phase 17.
  • the first phase 13 is composed of a plurality of first particles 19 containing tungsten and carbon.
  • the second phase 15 is composed of a plurality of second particles 21 containing aluminum and oxygen.
  • the second particles may be alumina particles.
  • the third phase 17 is composed of third particles 23 containing tungsten and carbon. At least one of the second particles has third particles therein.
  • the second particle 21 having the third particle inside does not indicate a state in which the third particle 23 is surrounded by the plurality of second particles 21, but inside one second particle 21. The state in which the 3rd particle 23 exists is pointed out.
  • Such a state is a state in which there is no grain boundary phase connecting the third particle 23 and the grain boundary phase around the second particle 21 existing around the third particle 23.
  • SEM scanning electron microscope
  • the first particles 19 and the third particles 23 are, for example, tungsten carbide, and mainly contain what is represented by a composition formula WC, but may contain what is represented by a composition formula W 2 C. .
  • alumina in the second particle 21 include ⁇ -Al 2 O 3 and ⁇ -Al 2 O 3 .
  • the first particles 19 are not limited to the above configuration, and may contain other components as long as they contain tungsten and carbon. For example, you may contain the element which belongs to periodic table 4A, 5A, 6A.
  • the first particles 19 may contain chromium (Cr), cobalt (Co), or nickel (Ni), and titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V ), Niobium (Nb), tantalum (Ta) and molybdenum (Mo) compounds (oxides, carbides and nitrides).
  • the composition formula is represented by Cr 3 C, Cr 3 C 2 and Cr 7 C 3 A thing may be used.
  • the content ratio of tungsten in the first particles 19 in terms of carbide is set to about 80 to 100% by mass, for example.
  • the content ratio of chromium in terms of carbide is set to, for example, about 2 to 10% by mass.
  • the content ratio of alumina in the second particles 21 is set to, for example, about 80 to 100% by mass.
  • the second particles 21 may similarly contain other components.
  • the third particle 23 contains tungsten and carbon.
  • the third phase 17 may be composed of, for example, tungsten carbide only.
  • the third particles 23 are not strictly limited to those composed solely of tungsten carbide, and allow a configuration containing other components that are inevitable in the manufacturing process, specifically about 0.05 mass%. .
  • each phase in a cross-sectional view can be confirmed by, for example, a scanning electron microscope (SEM) image, and elemental analysis in each phase is performed by, for example, an energy dispersive X-ray spectrometer (EDX) attached to the scanning electron microscope.
  • SEM-EDX energy dispersive X-ray spectrometer
  • the SEM-EDX method using can be evaluated.
  • confirmation of the contained component which comprises each phase can be evaluated by using X-ray diffraction (XRD) method, for example.
  • XRD X-ray diffraction
  • tungsten carbide is obtained. If chromium is further confirmed, it is a carbide of tungsten and chromium. When the first particles 19 contain chromium, the corrosion resistance of the substrate 3 is improved. Furthermore, if aluminum and oxygen are confirmed in the second particles 21 present in the second phase 15, it is alumina. In addition, if tungsten and carbon are confirmed in the third particles 23 present in the second particles 21, it can be said that the third particles 23 made of tungsten carbide are located inside the second particles 21.
  • the alumina is compared with tungsten carbide. Low bending strength. Therefore, when a strong load is applied to the ceramic member 3 such as during cutting, cracks may occur in the alumina that is the second particles 21. If this crack extends for a long time, the strength of the ceramic member 3 may decrease.
  • the third particles 23 made of tungsten carbide are located inside the second particles 21 constituting the second phase 15.
  • the third phase 17 has a high hardness because it consists essentially of tungsten carbide. Therefore, even if a crack is generated in the second particle 21, the progress of the crack can be stably suppressed by the third particle 23 existing inside the second particle 21. Thereby, since a possibility that a crack extends long in the 2nd particle 21 becomes small, the fall of the intensity of ceramic member 3 is avoided.
  • the first particle 19 does not contain either WC or W 2 C, but contains WC and W 2 C.
  • the bonding strength between the WC in the first particles 19 and the alumina in the second particles 21 is increased by W 2 C, so that the strength of the substrate 3 as a whole is increased.
  • the second phase 15 may contain at least one of magnesium (Mg), calcium (Ca), strontium (Sr), silicon (Si), and Group 3a group oxide of the periodic table.
  • Mg magnesium
  • Ca calcium
  • Si silicon
  • Group 3a group oxide of the periodic table for example, in the second phase 15, the above oxide can be used as a sintering aid for alumina.
  • the second phase 15 may contain tungsten.
  • the affinity of the first phase 13 and the second phase 15 is increased.
  • the second particle 21 has an outer peripheral region from the boundary with the first phase 13 to a depth of 1 ⁇ m and an inner region located inside the outer peripheral region, and the content ratio of tungsten in the outer peripheral region is If the content ratio of tungsten in the inner region is higher, the affinity for the first phase 13 can be increased in the outer region while ensuring the strength of the second particles 19 in the inner region.
  • the first phase 13 in the present disclosure has a plurality of first particles 19 containing tungsten and carbon.
  • the second phase 15 has a plurality of second particles 21 containing alumina.
  • the third phase 17 has a plurality of third particles 23 containing tungsten and carbon.
  • the boundary of each particle can be determined by analyzing a transmission electron microscope (TEM) image or an image by electron backscatter diffraction (EBSD), for example.
  • TEM transmission electron microscope
  • EBSD electron backscatter diffraction
  • the size of each of the first to third particles is not particularly limited, but is set to about 0.5 to 2 ⁇ m, for example. At this time, when the average particle diameter of the second particles 21 is larger than the average particle diameter of the first particles 19, the strength of the substrate 3 is further increased.
  • the average particle diameter can be confirmed, for example, by measuring the equivalent circle diameter by image analysis using a cross-sectional SEM image.
  • the second phase 15 cracks are more likely to occur on the surface of the second particles 21, in other words, between the plurality of second particles 21 than in the second particles 21.
  • the average particle size of the second particles 21 is relatively large, the surface area of the second particles 21 in the second phase 15 is reduced, so that cracks are less likely to occur in the second phase 15.
  • the 1st phase 13 can be densified because the average particle diameter of the 1st particle
  • the third phase 17 is easily dispersed in the second particles 21. Therefore, even if a crack is generated in the second particle 21, the progress of the crack is easily stopped by the third particle 23.
  • the first phase 13 and the second phase 15 have a configuration in which a plurality of first particles 19 and a plurality of second particles 21 are mixed.
  • the strength of the substrate 3 can be further increased. Since the plurality of second phases 15 are divided by the first phase 13, even if a crack occurs in a part of the second phase 15, the progress of the crack is stopped in the first phase 13. Therefore, it is possible to avoid the cracks from extending for a long time.
  • the network structure described above refers to a state in which a plurality of second particles 21 are dispersed to form a plurality of second phases 15 and each second phase 15 is surrounded by one first phase 13. .
  • each second phase 15 is surrounded by one first phase 13.
  • one first phase 13 is configured, it can be said that the first phase 13 has a network structure, and the plurality of second phases 15 are located in the network structure.
  • the cutting tool 1 of the present disclosure may have a coating layer 11 on the surface of the base 3.
  • the covering layer 11 is provided for the purpose of suppressing wear of the cutting tool 1.
  • the material used for the coating layer 11 include titanium compounds, alumina, and diamond.
  • the titanium compound include TiC, TiN, TiCN, TiAlN, and TiCNO.
  • a TiAlN layer may be used to increase wear resistance.
  • These coating films 11 can be provided by coating the surface of the substrate 3 with the above-described material using a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method.
  • CVD chemical vapor deposition
  • PVD physical vapor deposition
  • a coating layer 11 formed by a PVD method may be used.
  • the PVD coating is provided, compressive stress is generated in the substrate, and the fracture resistance of the cutting tool is improved.
  • an inorganic material powder as a raw material of the substrate 3 is prepared.
  • tungsten carbide powder constituting the first phase 13 and the third phase 17 WC particles having an average particle diameter of 0.1 to 2 ⁇ m are prepared.
  • chromium carbide powder constituting the first phase 13 0.1 to 2 ⁇ m Cr 3 C 2 particles are prepared.
  • alumina particles constituting the second phase 15 0.1-2 ⁇ m Al 2 O 3 particles are prepared.
  • the average particle diameter of the Al 2 O 3 particles is larger than the WC particles and the W 2 C particles, the average particle diameter of the second particles 21 in the substrate 3 is the average of the first particles 19 and the third particles 23. It is easy to make it larger than the particle size.
  • Metal powder and carbon powder are added and mixed as appropriate to the powder of the inorganic material.
  • a known molding method such as press molding, cast molding, extrusion molding or cold isostatic pressing, the above mixed powder is molded into a predetermined tool shape to obtain a molded body.
  • the substrate 3 is produced by firing the compact in a vacuum or in a non-oxidizing atmosphere. Polishing or honing is performed on the surface of the manufactured substrate 3. Note that polishing and honing may be omitted if unnecessary.
  • the calcination is performed, for example, at a temperature of 1800 to 1950 ° C. for 6 hours or more in a reducing atmosphere containing an inert gas such as argon (Ar) and neon (Ne) or carbon.
  • the third particles 23 are formed by firing at a sintering temperature of 1800 to 1950 ° C., which is higher than the temperature at which alumina decomposes, for 6 hours or longer, excluding the time required for heating and cooling.
  • the tungsten carbide powder to be surrounded is surrounded by decomposed alumina to form the substrate 3 having the configuration of the present disclosure.
  • the Cr 3 C 2 particles become a liquid phase, and the first phase 13 tends to have a network structure.
  • the surface of the prepared base 3 is coated with a titanium compound or the like using a chemical vapor deposition method or a physical vapor deposition method, whereby the cutting tool 1 provided with the base 3 and the coating layer 11 is produced.
  • this coating process is omitted, the cutting tool 1 having only the base 3 is produced.
  • chromium carbide is used as the raw material.
  • the chromium carbide may be excluded and the tungsten carbide powder or alumina particles may be used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Composite Materials (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Abstract

Un élément céramique selon la présente invention comprend : une pluralité de premières particules qui contiennent du tungstène et du carbone; et une pluralité de deuxièmes particules qui contiennent de l'aluminium et de l'oxygène. Au moins une des deuxièmes particules contient à l'intérieur une troisième particule qui contient du tungstène et du carbone. Un outil de coupe selon la présente invention est pourvu de cet élément en céramique.
PCT/JP2017/046736 2016-12-26 2017-12-26 Élément céramique et outil de coupe WO2018124108A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2018559533A JP6913696B2 (ja) 2016-12-26 2017-12-26 セラミック部材及び切削工具

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JP2016250586 2016-12-26
JP2016-250586 2016-12-26

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WO2018124108A1 true WO2018124108A1 (fr) 2018-07-05

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WO (1) WO2018124108A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021000684A (ja) * 2019-06-21 2021-01-07 日本特殊陶業株式会社 セラミックス工具
JP2021151931A (ja) * 2020-03-24 2021-09-30 日本特殊陶業株式会社 セラミックス切削工具、及び切削工具

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05279121A (ja) * 1992-03-31 1993-10-26 Kyocera Corp 炭化タングステン−アルミナ質焼結体およびその製法
JP2016113320A (ja) * 2014-12-15 2016-06-23 日本特殊陶業株式会社 セラミック部材および切削工具

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5271758A (en) * 1990-10-10 1993-12-21 Valenite Inc. Alumina ceramic-metal articles
JP2958731B2 (ja) * 1992-02-14 1999-10-06 日本特殊陶業株式会社 酸化アルミニウム基焼結体及びその製造方法
JPH0797257A (ja) * 1993-09-29 1995-04-11 Toshiba Tungaloy Co Ltd 複合焼結体
JPH07232980A (ja) * 1994-02-17 1995-09-05 Toshiba Tungaloy Co Ltd 被覆複合焼結体
JP2004238660A (ja) 2003-02-04 2004-08-26 Tungaloy Corp クロム含有超硬合金
CA2881195C (fr) 2013-08-08 2018-03-20 Jun Moteki Composition de ceramique et outil de coupe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05279121A (ja) * 1992-03-31 1993-10-26 Kyocera Corp 炭化タングステン−アルミナ質焼結体およびその製法
JP2016113320A (ja) * 2014-12-15 2016-06-23 日本特殊陶業株式会社 セラミック部材および切削工具

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021000684A (ja) * 2019-06-21 2021-01-07 日本特殊陶業株式会社 セラミックス工具
JP2021151931A (ja) * 2020-03-24 2021-09-30 日本特殊陶業株式会社 セラミックス切削工具、及び切削工具
JP7388961B2 (ja) 2020-03-24 2023-11-29 Ｎｔｋカッティングツールズ株式会社 セラミックス切削工具、及び切削工具

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JP6913696B2 (ja) 2021-08-04
JP7208294B2 (ja) 2023-01-18
JPWO2018124108A1 (ja) 2019-11-07
JP2021119112A (ja) 2021-08-12
JP2023041692A (ja) 2023-03-24

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