WO2021124403A1 - 立方晶窒化硼素焼結体 - Google Patents
立方晶窒化硼素焼結体 Download PDFInfo
- Publication number
- WO2021124403A1 WO2021124403A1 PCT/JP2019/049195 JP2019049195W WO2021124403A1 WO 2021124403 A1 WO2021124403 A1 WO 2021124403A1 JP 2019049195 W JP2019049195 W JP 2019049195W WO 2021124403 A1 WO2021124403 A1 WO 2021124403A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- group
- boron nitride
- cubic boron
- sintered body
- powder
- Prior art date
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- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 229910052582 BN Inorganic materials 0.000 title claims abstract description 118
- 239000002245 particle Substances 0.000 claims abstract description 93
- 150000001875 compounds Chemical class 0.000 claims abstract description 70
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 54
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 30
- 239000010941 cobalt Substances 0.000 claims abstract description 30
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 29
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 27
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 27
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 26
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910021480 group 4 element Inorganic materials 0.000 claims abstract description 26
- 229910021478 group 5 element Inorganic materials 0.000 claims abstract description 26
- 229910021476 group 6 element Inorganic materials 0.000 claims abstract description 26
- 239000010703 silicon Substances 0.000 claims abstract description 26
- 230000000737 periodic effect Effects 0.000 claims abstract description 25
- 239000006104 solid solution Substances 0.000 claims abstract description 23
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 19
- 239000000956 alloy Substances 0.000 claims abstract description 19
- 229910052796 boron Inorganic materials 0.000 claims abstract description 18
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
- 239000001301 oxygen Substances 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 239000011575 calcium Substances 0.000 claims description 19
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 17
- 229910052791 calcium Inorganic materials 0.000 claims description 17
- 239000011230 binding agent Substances 0.000 abstract description 64
- 229910000765 intermetallic Inorganic materials 0.000 abstract description 10
- 239000000843 powder Substances 0.000 description 157
- 239000002994 raw material Substances 0.000 description 65
- 238000000034 method Methods 0.000 description 46
- 238000005520 cutting process Methods 0.000 description 30
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 26
- 238000005259 measurement Methods 0.000 description 21
- 229910000760 Hardened steel Inorganic materials 0.000 description 16
- 239000010936 titanium Substances 0.000 description 16
- 229910052751 metal Inorganic materials 0.000 description 15
- 239000011651 chromium Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 14
- 239000000203 mixture Substances 0.000 description 14
- 239000002184 metal Substances 0.000 description 13
- 239000011812 mixed powder Substances 0.000 description 13
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 12
- 238000003754 machining Methods 0.000 description 11
- 229910052735 hafnium Inorganic materials 0.000 description 10
- 229910052719 titanium Inorganic materials 0.000 description 10
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 9
- 238000002441 X-ray diffraction Methods 0.000 description 9
- 229910052804 chromium Inorganic materials 0.000 description 9
- 239000012535 impurity Substances 0.000 description 9
- 238000002156 mixing Methods 0.000 description 9
- 238000010298 pulverizing process Methods 0.000 description 9
- 229910052750 molybdenum Inorganic materials 0.000 description 8
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 8
- 229910052715 tantalum Inorganic materials 0.000 description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 7
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 7
- 239000011733 molybdenum Substances 0.000 description 7
- 239000010955 niobium Substances 0.000 description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 6
- -1 hafnium nitride Chemical class 0.000 description 6
- 229910052758 niobium Inorganic materials 0.000 description 6
- 150000004767 nitrides Chemical class 0.000 description 6
- 229910010413 TiO 2 Inorganic materials 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000000691 measurement method Methods 0.000 description 5
- 239000012299 nitrogen atmosphere Substances 0.000 description 5
- 229910052721 tungsten Inorganic materials 0.000 description 5
- 229910052720 vanadium Inorganic materials 0.000 description 5
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 229910026551 ZrC Inorganic materials 0.000 description 4
- OTCHGXYCWNXDOA-UHFFFAOYSA-N [C].[Zr] Chemical compound [C].[Zr] OTCHGXYCWNXDOA-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 229910017604 nitric acid Inorganic materials 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- NMJKIRUDPFBRHW-UHFFFAOYSA-N titanium Chemical compound [Ti].[Ti] NMJKIRUDPFBRHW-UHFFFAOYSA-N 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000005469 synchrotron radiation Effects 0.000 description 3
- 229910052726 zirconium Inorganic materials 0.000 description 3
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000002775 capsule Substances 0.000 description 2
- NUEWEVRJMWXXFB-UHFFFAOYSA-N chromium(iii) boride Chemical compound [Cr]=[B] NUEWEVRJMWXXFB-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- WHJFNYXPKGDKBB-UHFFFAOYSA-N hafnium;methane Chemical compound C.[Hf] WHJFNYXPKGDKBB-UHFFFAOYSA-N 0.000 description 2
- 229960002050 hydrofluoric acid Drugs 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- UNASZPQZIFZUSI-UHFFFAOYSA-N methylidyneniobium Chemical compound [Nb]#C UNASZPQZIFZUSI-UHFFFAOYSA-N 0.000 description 2
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 2
- 229910000480 nickel oxide Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000000550 scanning electron microscopy energy dispersive X-ray spectroscopy Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 229910003468 tantalcarbide Inorganic materials 0.000 description 2
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 2
- PMTRSEDNJGMXLN-UHFFFAOYSA-N titanium zirconium Chemical compound [Ti].[Zr] PMTRSEDNJGMXLN-UHFFFAOYSA-N 0.000 description 2
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 2
- ZVWKZXLXHLZXLS-UHFFFAOYSA-N zirconium nitride Chemical compound [Zr]#N ZVWKZXLXHLZXLS-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- 229910020639 Co-Al Inorganic materials 0.000 description 1
- 229910020675 Co—Al Inorganic materials 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910003564 SiAlON Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910004688 Ti-V Inorganic materials 0.000 description 1
- 229910010038 TiAl Inorganic materials 0.000 description 1
- 229910010037 TiAlN Inorganic materials 0.000 description 1
- 229910010169 TiCr Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229910011214 Ti—Mo Inorganic materials 0.000 description 1
- 229910010968 Ti—V Inorganic materials 0.000 description 1
- KREHIIWCKNFTNC-UHFFFAOYSA-N [Cr].[Ti].[Ti] Chemical compound [Cr].[Ti].[Ti] KREHIIWCKNFTNC-UHFFFAOYSA-N 0.000 description 1
- VSTCOQVDTHKMFV-UHFFFAOYSA-N [Ti].[Hf] Chemical compound [Ti].[Hf] VSTCOQVDTHKMFV-UHFFFAOYSA-N 0.000 description 1
- QAKIDWGXFZCSRP-UHFFFAOYSA-N [Ti].[Mo].[Ti] Chemical compound [Ti].[Mo].[Ti] QAKIDWGXFZCSRP-UHFFFAOYSA-N 0.000 description 1
- YSTWCCHWWMEAKP-UHFFFAOYSA-N [Ti].[V].[Ti] Chemical compound [Ti].[V].[Ti] YSTWCCHWWMEAKP-UHFFFAOYSA-N 0.000 description 1
- GGPQWIMALBOMEF-UHFFFAOYSA-N [Ti].[Zr].[Ti] Chemical compound [Ti].[Zr].[Ti] GGPQWIMALBOMEF-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- DJPURDPSZFLWGC-UHFFFAOYSA-N alumanylidyneborane Chemical compound [Al]#B DJPURDPSZFLWGC-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 description 1
- GPBUGPUPKAGMDK-UHFFFAOYSA-N azanylidynemolybdenum Chemical compound [Mo]#N GPBUGPUPKAGMDK-UHFFFAOYSA-N 0.000 description 1
- IVHJCRXBQPGLOV-UHFFFAOYSA-N azanylidynetungsten Chemical compound [W]#N IVHJCRXBQPGLOV-UHFFFAOYSA-N 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- LGLOITKZTDVGOE-UHFFFAOYSA-N boranylidynemolybdenum Chemical compound [Mo]#B LGLOITKZTDVGOE-UHFFFAOYSA-N 0.000 description 1
- QDWJUBJKEHXSMT-UHFFFAOYSA-N boranylidynenickel Chemical compound [Ni]#B QDWJUBJKEHXSMT-UHFFFAOYSA-N 0.000 description 1
- JEEHQNXCPARQJS-UHFFFAOYSA-N boranylidynetungsten Chemical compound [W]#B JEEHQNXCPARQJS-UHFFFAOYSA-N 0.000 description 1
- HGHPQUIZVKPZEU-UHFFFAOYSA-N boranylidynezirconium Chemical compound [B].[Zr] HGHPQUIZVKPZEU-UHFFFAOYSA-N 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(iv) oxide Chemical compound O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002354 inductively-coupled plasma atomic emission spectroscopy Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- CNEOGBIICRAWOH-UHFFFAOYSA-N methane;molybdenum Chemical compound C.[Mo] CNEOGBIICRAWOH-UHFFFAOYSA-N 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- 238000001004 secondary ion mass spectrometry Methods 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- KZSANQWSFFXRLM-UHFFFAOYSA-N titanium Chemical compound [Ti].[Ti].[Ti].[Ti] KZSANQWSFFXRLM-UHFFFAOYSA-N 0.000 description 1
- NGTRBIBDROJPHU-UHFFFAOYSA-N titanium tungsten Chemical compound [Ti][Ti][W][Ti] NGTRBIBDROJPHU-UHFFFAOYSA-N 0.000 description 1
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000002424 x-ray crystallography Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- 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
- C04B35/583—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 based on boron nitride
- C04B35/5831—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 based on boron nitride based on cubic boron nitrides or Wurtzitic boron nitrides, including crystal structure transformation of powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
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- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
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- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Definitions
- the present disclosure relates to a cubic boron nitride sintered body.
- cBN sintered body As a high hardness material used for cutting tools and the like, there is a cubic boron nitride sintered body (hereinafter, also referred to as “cBN sintered body”).
- the cBN sintered body is usually composed of cubic boron nitride particles (hereinafter, also referred to as “cBN particles”) and a bonded phase, and its characteristics tend to differ depending on the content ratio of the cBN particles.
- cBN sintered body having a low content of cubic boron nitride (hereinafter, also referred to as “cBN”) can be suitably used for cutting hardened steel and the like.
- Patent Document 1 contains 45 to 70% by volume of cBN particles as a cBN sintered body tool having optimized crater resistance and strength and excellent fracture resistance.
- a cutting tool comprising a cBN sintered body obtained by sintering a mixture in a bonding phase is disclosed.
- the cubic boron nitride sintered body of the present disclosure is a cubic boron nitride sintered body comprising 30% by volume or more and 80% by volume or less of cubic boron nitride particles and a bonded phase of 20% by volume or more and 70% by volume or less.
- the binding phase is -At least one selected from the group consisting of elemental substances, alloys, and intermetallic compounds selected from the group consisting of Group 4 elements, Group 5 elements, Group 6 elements, aluminum, silicon, cobalt, and nickel in the periodic table.
- a compound consisting of at least one element selected from the group and at least one selected from the group consisting of a solid solution derived from the compound are included.
- the dislocation density of the cubic boron nitride particles is 3 ⁇ 10 17 / m 2 or more and 1 ⁇ 10 20 / m 2 or less, which is a cubic boron nitride sintered body.
- an object of the present invention is to provide a cubic boron nitride sintered body capable of extending the life of a tool even in intermittent machining of hardened steel when used as a tool material.
- the cubic boron nitride sintered body of the present disclosure comprises cubic boron nitride particles having 30% by volume or more and 80% by volume or less and a bonded phase of 20% by volume or more and 70% by volume or less. It is a sintered body
- the binding phase is -At least one selected from the group consisting of elemental substances, alloys, and intermetallic compounds selected from the group consisting of Group 4 elements, Group 5 elements, Group 6 elements, aluminum, silicon, cobalt, and nickel in the periodic table. Including or -A group consisting of at least one element selected from the group consisting of Group 4 elements, Group 5 elements, Group 6 elements, aluminum, silicon, cobalt and nickel in the periodic table, and nitrogen, carbon, boron and oxygen.
- a compound consisting of at least one element selected from the group and at least one selected from the group consisting of a solid solution derived from the compound are included.
- the dislocation density of the cubic boron nitride particles is 3 ⁇ 10 17 / m 2 or more and 1 ⁇ 10 20 / m 2 or less, which is a cubic boron nitride sintered body.
- cubic boron nitride sintered body of the present disclosure is used as a tool material, it is possible to extend the life of the tool even in high-speed machining of hardened steel.
- the dislocation density of the cubic boron nitride particles is preferably 5 ⁇ 10 17 / m 2 or more and 9.5 ⁇ 10 19 / m 2 or less. According to this, the tool life is further improved.
- the cubic boron nitride particles preferably contain 0.02% by mass or more and 0.2% by mass or less of calcium. According to this, the tool life is further improved.
- the cubic boron nitride particles preferably contain 0.02% by mass or more and 0.17% by mass or less of calcium. According to this, the tool life is further improved.
- the cubic boron nitride particles preferably contain 0.02% by mass or more and 0.15% by mass or less of calcium. According to this, the tool life is further improved.
- the cubic boron nitride sintered body preferably contains the cubic boron nitride particles in an amount of 40% by volume or more and 75% by volume or less. According to this, the tool life is further improved.
- the present inventors investigated the cause of shortening the tool life when a tool using a conventional cubic boron nitride sintered body was used for intermittent machining of hardened steel.
- the strength of the cubic boron nitride sintered body is insufficient, and especially when the tool is used for intermittent machining of hardened steel, cracks occur due to insufficient strength, which leads to a decrease in tool life.
- the strength of the cubic boron nitride sintered body is insufficient, and especially when the tool is used for intermittent machining of hardened steel, cracks occur due to insufficient strength, which leads to a decrease in tool life. was newly found.
- the present inventors have conducted a more detailed study on the factors that affect the strength of the cubic boron nitride sintered body. As a result, the present inventors have newly found that the dislocation density of the cubic boron nitride particles affects the strength of the cubic boron nitride sintered body. Since cubic boron nitride contains a large number of dislocations, those skilled in the art have not paid attention to the relationship between the dislocation density of cubic boron nitride particles and the tool life.
- the notation in the form of "A to B" means the upper and lower limits of the range (that is, A or more and B or less), and when the unit is not described in A and the unit is described only in B, A The unit of and the unit of B are the same.
- a compound or the like when represented by a chemical formula, it shall include all conventionally known atomic ratios when the atomic ratio is not particularly limited, and should not necessarily be limited to those in the chemical quantitative range.
- the ratio of the number of atoms constituting TiN when described as "TiN", includes any conventionally known atomic ratio.
- the cubic boron nitride sintered body according to the embodiment of the present disclosure is a cubic crystal comprising 30% by volume or more and 80% by volume or less of cubic boron nitride particles and a bonding phase of 20% by volume or more and 70% by volume or less.
- the binding phase is -At least one selected from the group consisting of elemental substances, alloys, and intermetallic compounds selected from the group consisting of Group 4 elements, Group 5 elements, Group 6 elements, aluminum, silicon, cobalt, and nickel in the periodic table.
- a compound consisting of at least one element selected from the group and at least one selected from the group consisting of a solid solution derived from the compound are included.
- the dislocation density of the cubic boron nitride particles is 3 ⁇ 10 17 / m 2 or more and 1 ⁇ 10 20 / m 2 or less, which is a cubic boron nitride sintered body.
- the cubic boron nitride sintered body of the present disclosure contains 30% by volume or more and 80% by volume or less of cBN particles having high hardness, strength and toughness. Therefore, it is presumed that the cubic boron nitride sintered body has excellent wear resistance and fracture resistance, and the tool life is extended.
- the bonding phase is -At least one selected from the group consisting of elemental substances, alloys, and intermetallic compounds selected from the group consisting of Group 4 elements, Group 5 elements, Group 6 elements, aluminum, silicon, cobalt, and nickel in the periodic table.
- the binding phase has a high binding force to the cBN particles. Therefore, it is presumed that the cubic boron nitride sintered body has excellent fracture resistance and the tool life is extended.
- the dislocation density of the cubic boron nitride particles is 3 ⁇ 10 17 / m 2 or more and 1 ⁇ 10 20 / m 2 or less.
- the cubic boron nitride particles have improved thermal conductivity. Therefore, the thermal conductivity of the cubic boron nitride sintered body containing the cubic boron nitride particles is also improved. Therefore, even when a tool using the cubic boron nitride sintered body is used for high-speed machining of hardened steel, the temperature near the contact point with the work material is unlikely to rise, crater wear is suppressed, and the tool is used. It is presumed that the life will be extended.
- the work material is not limited to this.
- the work material include carburized hardened steel (SCM415H, SCr420H), induction hardened steel (S45C), bearing steel (SUJ2) and the like.
- the cubic boron nitride sintered body of the present disclosure includes cubic boron nitride particles of 30% by volume or more and 80% by volume or less, and a bonded phase of 20% by volume or more and 70% by volume or less.
- the cBN sintered body may contain unavoidable impurities due to raw materials, manufacturing conditions, and the like.
- the lower limit of the content ratio of cBN particles in the cBN sintered body is 30% by volume, preferably 35% by volume, and more preferably 40% by volume.
- the upper limit of the content ratio of the cBN particles in the cBN sintered body is 80% by volume, preferably 77% by volume, and more preferably 75% by volume.
- the content ratio of the cBN particles in the cBN sintered body is 30% by volume and 80% by volume or less, preferably 35% by volume or more and 77% by volume or less, and more preferably 40% by volume or more and 75% by volume or less.
- the lower limit of the content ratio of the bonded phase in the cBN sintered body is 20% by volume, preferably 23% by volume, and more preferably 25% by volume.
- the upper limit of the content ratio of the bonded phase in the cBN sintered body is 70% by volume, preferably 65% by volume, and more preferably 60% by volume.
- the content ratio of the bonded phase in the cBN sintered body is 20% by volume or more and 70% by volume or less, preferably 23% by volume or more and 65% by volume or less, and more preferably 25% by volume or more and 60% by volume or less.
- the content ratio (volume%) of cBN particles and the content ratio (volume%) of the bonded phase in the cBN sintered body are attached to the scanning electron microscope (SEM) (“JSM-7800F” (trade name) manufactured by JEOL Ltd.).
- SEM scanning electron microscope
- EDX energy dispersive X-ray analyzer
- microstructure observation, element analysis, etc. are performed on the cBN sintered body. It can be confirmed by doing.
- the specific measurement method is as follows.
- an arbitrary position of the cBN sintered body is cut to prepare a sample including a cross section of the cBN sintered body.
- a focused ion beam device, a cross-section polisher device, or the like can be used to prepare the cross section.
- the cross section is observed by SEM at a magnification of 5000 to obtain a reflected electron image.
- the region where the cBN particles are present is the black region, and the region where the bound phase is present is the gray region or the white region.
- the reflected electron image is binarized using image analysis software (“WinROOF” of Mitani Shoji Co., Ltd.). From the image after the binarization process, the area ratio of the pixels derived from the dark field (pixels derived from the cBN particles) to the area of the measurement field of view is calculated. By regarding the calculated area ratio as a volume%, the content ratio (volume%) of the cBN particles can be obtained.
- WinROOF image analysis software
- the content ratio (volume%) of the coupled phase by calculating the area ratio of the pixels derived from the bright field (pixels derived from the coupled phase) to the area of the measurement visual field from the image after the binarization process. Can be done.
- the fact that the pixels derived from the dark field are derived from the cBN particles can be confirmed by performing elemental analysis of the cBN sintered body by SEM-EDX.
- the cubic boron nitride sintered body of the present disclosure may contain unavoidable impurities as long as the effects of the present disclosure are exhibited.
- unavoidable impurities include hydrogen, oxygen, carbon, alkali metal elements (lithium (Li), sodium (Na), potassium (K), etc.) and alkaline earth metal elements (calcium (Ca), magnesium (Mg), etc.).
- the content of the unavoidable impurities is preferably 0.1% by mass or less.
- the content of unavoidable impurities can be measured by secondary ion mass spectrometry (SIMS).
- the dislocation density of the cubic boron nitride particles contained in the cubic boron nitride sintered body of the present disclosure is 3 ⁇ 10 17 / m 2 or more and 1 ⁇ 10 20 / m 2 or less.
- the dislocation density is 1 ⁇ 10 20 / m 2 or less, defects due to defects in the particles are unlikely to occur, and the tool life is extended.
- the lower limit of the dislocation density of the cubic boron nitride particles is 3 ⁇ 10 17 / m 2 or more, preferably 5 ⁇ 10 17 / m 2 or more, and more preferably 8 ⁇ 10 17 / m 2 or more.
- the upper limit of the dislocation density is 1 ⁇ 10 20 / m 2 or less, preferably 9.5 ⁇ 10 19 / m 2 or less, and more preferably 9 ⁇ 10 19 / m 2 or less.
- the dislocation density is 3 ⁇ 10 17 / m 2 or more and 1 ⁇ 10 20 / m 2 or less, preferably 5 ⁇ 10 17 / m 2 or more and 9.5 ⁇ 10 19 / m 2 or less, and 8 ⁇ 10 17 / m 2 or less. More preferably 9 ⁇ 10 19 / m 2 or less.
- the dislocation density of cubic boron nitride particles is measured at a large synchrotron radiation facility (for example, SPring-8 (Hyogo Prefecture)). Specifically, it is measured by the following method.
- the cBN particles are filled in a 0.3 mm ⁇ X-ray crystallography capillary (TOHO “Mark Tube” (trademark)) manufactured by TOHO to prepare a sealed test piece.
- test piece was subjected to X-ray diffraction measurement under the following conditions, and the main orientations of cubic boron nitride (111), (200), (220), (311), (400), and (531). Obtain the line profile of the diffraction peak from each azimuth plane.
- X-ray diffraction measurement conditions X-ray source: Synchrotron radiation Device condition: Detector MYTHEN Energy: 18 keV (wavelength: 0.6888 ⁇ ) Camera length: 573 mm Measurement peaks: (111), (200), (220), (311), (400), (531) of cubic boron nitride. However, if it is difficult to obtain a profile due to texture and orientation, the peak of the surface index is excluded.
- Measurement conditions Make sure that the number of measurement points is 9 or more within the full width at half maximum corresponding to each measurement peak.
- the peak top intensity shall be 2000 counts or more. Since the hem of the peak is also used for analysis, the measurement range is about 10 times the full width at half maximum.
- the line profile obtained by the above-mentioned X-ray diffraction measurement has a shape that includes both true spread due to physical quantities such as non-uniform strain of the sample and spread due to the device.
- the device-derived components are removed from the measured line profile to obtain a true line profile.
- the true line profile is obtained by fitting the obtained line profile and the device-derived line profile by a pseudo Voigt function and subtracting the device-derived line profile.
- LaB 6 was used as a standard sample for removing the diffraction line spread caused by the device. Further, when synchrotron radiation having high parallelism is used, the diffraction line spread caused by the device can be regarded as zero.
- the dislocation density is calculated by analyzing the obtained true line profile using the modified Williamson-Hall method and the modified Warren-Averbach method.
- the modified Williamson-Hall method and the modified Warren-Averbach method are known line profile analysis methods used to determine the dislocation density.
- the coefficient q for each of the contrast factor C h00 and contrast factor in screw dislocations and edge dislocations using the calculation code ANIZC, slip system ⁇ 110> ⁇ 111 ⁇ , the elastic stiffness C 11 8 It is calculated as .44 GPa, C 12 is 1.9 GPa, and C 44 is 4.83 GPa.
- the contrast factor C h00 is a spiral dislocation 0.203 and a blade dislocation 0.212.
- the coefficients q with respect to the contrast factor are spiral dislocations 1.65 and blade dislocations 0.58.
- the spiral dislocation ratio is fixed at 0.5
- the blade dislocation ratio is fixed at 0.5.
- the cubic boron nitride particles contained in the cubic boron nitride sintered body of the present disclosure preferably contain 0.2% by mass or less of calcium.
- the cBN particles contain calcium, the atomic vacancies in the cBN particles are reduced, the strength and toughness of the cBN particles themselves at room temperature and high temperature are improved, and the life of the tool using the cubic boron nitride sintered body is further extended. improves.
- the upper limit of the calcium content of the cubic boron nitride particles is preferably 0.2% by mass, more preferably 0.17% by mass, and even more preferably 0.15% by mass.
- the lower limit of the calcium content of the cubic boron nitride particles is not particularly limited, but 0.02% by mass is preferable from the viewpoint of production.
- the calcium content of the cubic boron nitride particles is preferably 0.02% by mass or more and 0.2% by mass or less, more preferably 0.02% by mass or more and 0.17% by mass or less, and 0.02% by mass or more and 0. It is more preferably 15% by mass or less.
- ICP inductively coupled plasma atomic emission spectrometry
- the median diameter d50 (hereinafter, also referred to as “median diameter d50”) of the equivalent circle diameter of the cubic boron nitride particles contained in the cubic boron nitride sintered body of the present disclosure is preferably 1 nm or more and 10000 nm or less, and 10 nm or more and 8000 nm. The following is more preferable. According to this, a tool using a cubic boron nitride sintered body can have a long tool life.
- the median diameter d50 of the equivalent circle diameter of the cubic boron nitride particles is defined by measuring the median diameter d50 of the plurality of cubic boron nitride particles at each of the five arbitrarily selected measurement points. It means the value obtained by calculating the average value of these.
- the specific measurement method is as follows.
- the portion of the cubic boron nitride sintered body is cut out with a diamond grindstone electrodeposition wire or the like, and the cut out cross section is polished to perform the polishing. Five measurement points are arbitrarily set on the surface.
- each cubic crystal is used with image processing software (Win Roof ver. 7.4.5) with the grain boundaries of the cubic boron nitride particles observed in the measurement field separated. Calculate the distribution of the equivalent circle diameter of the boron nitride particles.
- the median diameter d50 of each measurement point is calculated, and the average value of these is calculated.
- the average value corresponds to the median diameter d50 of the equivalent circle diameter of the cubic boron nitride particles.
- the bonded phase serves to enable cBN particles, which are difficult-to-sinter materials, to be sintered at industrial-level pressure temperatures.
- cBN particles which are difficult-to-sinter materials
- the bonded phase since the reactivity with iron is lower than that of cBN, it adds a function of suppressing chemical wear and thermal wear in cutting high-hardness hardened steel. Further, when the cBN sintered body contains a bonded phase, the wear resistance of the high hardness hardened steel in high efficiency machining is improved.
- the bonding phase is -Solid units, alloys, and metals selected from the group consisting of Group 4 elements, Group 5 elements, Group 6 elements, aluminum, silicon, cobalt, and nickel (hereinafter, also referred to as "Group A") in the periodic table.
- Group A Containing or containing at least one selected from the group consisting of compounds -At least one element selected from the group (Group A) consisting of Group 4 elements, Group 5 elements, Group 6 elements, aluminum, silicon, cobalt and nickel in the periodic table, nitrogen, carbon, boron and A compound consisting of at least one element selected from the group consisting of oxygen (hereinafter, also referred to as "group B") and at least one selected from the group consisting of a solid solution derived from the compound are included or used.
- group B A compound consisting of at least one element selected from the group consisting of oxygen
- (A) Consists of at least one of group A simple substances, alloys, and intermetallic compounds.
- (B) Contains at least one element, alloy, or intermetallic compound of group A.
- (D) A compound composed of at least one element selected from group A, at least one element selected from group B, and at least one selected from the group consisting of a solid solution derived from the compound.
- (E) A compound composed of at least one element of a simple substance, an alloy, and an intermetallic compound of group A, at least one element selected from group A, and at least one element selected from group B, and the above. It consists of at least one selected from the group consisting of solid solutions derived from compounds.
- Group 4 elements of the periodic table include, for example, titanium (Ti), zirconium (Zr) and hafnium (Hf).
- Group 5 elements include, for example, vanadium (V), niobium (Nb) and tantalum (Ta).
- Group 6 elements include, for example, chromium (Cr), molybdenum (Mo) and tungsten (W).
- first metal elements Group 4 elements, Group 5 elements, Group 6 elements, aluminum, silicon, cobalt and nickel are also referred to as "first metal elements”.
- Examples of the alloy of the first metal element include Ti-Zr, Ti-Hf, Ti-V, Ti-Nb, Ti-Ta, Ti-Cr, and Ti-Mo.
- Examples of the intermetallic compound of the first metal element include TiCr 2 , Ti 3 Al, and Co—Al.
- Examples of the compound (nitride) containing the first metal element and nitrogen include titanium nitride (TiN), zirconium nitride (ZrN), hafnium nitride (HfN), vanadium nitride (VN), and niobide nitride (NbN).
- Examples of the compound (carbide) containing the first metal element and carbon include titanium carbide (TiC), zirconium carbide (ZrC), hafnium carbide (HfC), vanadium carbide (VC), niobium carbide (NbC), and the like.
- Examples thereof include tantalum carbide (TaC), chromium carbide (Cr 3 C 2 ), molybdenum carbide (MoC), tungsten carbide (WC), silicon carbide (SiC), and tungsten carbide-cobalt (W 2 Co 3 C).
- Examples of the compound (boronized product) containing the first metal element and boron include titanium boborated (TiB 2 ), zirconium boron (ZrB 2 ), hafnium boborated (HfB 2 ), and vanadium boborated (VB). 2 ), Niob Boron (NbB 2 ), Tantal Boron (TaB 2 ), Chromium Boron (CrB), Molybdenum Boron (MoB), Tungsten Boron (WB), Aluminum Boron (AlB 2 ), Boron Examples thereof include cobalt (Co 2 B) and nickel boron (Ni 2 B).
- Examples of the compound (oxide) containing the first metal element and oxygen include titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), hafnium oxide (HfO 2 ), and vanadium oxide (V 2 O 5 ). , Nioboxide (Nb 2 O 5 ), Tantal Oxide (Ta 2 O 5 ), Chromium Oxide (Cr 2 O 3 ), Molybdenum Oxide (MoO 3 ), Tungsten Oxide (WO 3 ), Aluminum Oxide (Al 2 O 3 ) , Silicon oxide (SiO 2 ), cobalt oxide (CoO), nickel oxide (NiO).
- Examples of the compound (carbonitoxide) containing the first metal element, carbon and nitrogen include titanium carbonitide (TiCN), zirconium carbide (ZrCN), hafnium carbonitide (HfCN), and titanium carbonitide niobium (TiNbCN). ), Titanium carbonitide zirconium (TiZrCN), titanium carbonitide tantalum (TiTaCN), titanium carbonitide hafnium (TiHfCN), titanium carbonitide chromium (TiCrCN).
- Examples of the compound (oxynitride) composed of the first metal element, oxygen and nitrogen include titanium oxynitride (TiON), zirconium oxynitride (ZrON), hafnium oxynitride (HfON), and vanadium oxynitride (VON). ), Niobium oxynitride (NbON), Tantal oxynitride (TaON), Chromium oxynitride (CrON), Molybdenum oxynitride (MoON), Tungsten oxynitride (WON), Aluminum oxynitride (AlON), Silicon oxynitride (SiAlON) Can be mentioned.
- the solid solution derived from the above-mentioned bonded phase compound means a state in which two or more kinds of these compounds are dissolved in each other's crystal structure, and means an invasion type solid solution or a substitution type solid solution.
- the binding phase compound may be used, or two or more types may be used in combination.
- the lower limit of the total content of the bound phase compound and the solid solution derived from the bound phase compound in the bound phase is preferably 50% by volume, more preferably 60% by volume, still more preferably 70% by volume.
- the upper limit of the total content of the bound phase compound and the solid solution derived from the bound phase compound in the bound phase is preferably 80% by volume, more preferably 90% by volume, and most preferably 100% by volume.
- the total content of the bound phase compound and the solid solution derived from the bound phase compound in the bound phase is preferably 50% by volume or more and 80% by volume or less, more preferably 60% by volume or more and 90% by volume or less, and 70% by volume or more and 100% by volume or less. Is more preferable.
- the total content of the bound phase compound and the solid solution derived from the bound phase compound in the bound phase is measured by the RIR method (Reference Intensity Ratio) by XRD.
- the bound phase may contain other components in addition to the above-mentioned bound phase compound.
- elements constituting other components include manganese (Mn) and rhenium (Re).
- composition of the bonded phase contained in the cBN sintered body can be specified by XRD (X-ray diffraction measurement, X-ray Diffraction).
- the cubic boron nitride sintered body of the present disclosure is preferably used for cutting tools, abrasion resistant tools, grinding tools and the like.
- the cutting tool, the wear-resistant tool, and the grinding tool using the cubic boron nitride sintered body of the present disclosure may be entirely composed of the cubic boron nitride sintered body, or a part thereof (for example, a cutting tool). In the case of, only the cutting edge portion) may be composed of a cubic boron nitride sintered body. Further, a coating film may be formed on the surface of each tool.
- Cutting tools include drills, end mills, replaceable cutting tips for drills, replaceable cutting tips for end mills, replaceable cutting tips for milling, replaceable cutting tips for turning, metal saws, gear cutting tools, and reamers. , Taps, cutting tools, etc.
- wear-resistant tools include dies, scribers, scribing wheels, and dressers.
- the grinding tool include a grinding wheel.
- the cubic boron nitride sintered body of the present disclosure can be produced, for example, by the following method.
- a cubic boron nitride powder (hereinafter, also referred to as "cBN powder") and a binder raw material powder are prepared.
- the cBN powder is a raw material powder of cBN particles contained in the cBN sintered body.
- the cBN powder is not particularly limited, and known cBN powder can be used.
- the cBN powder was obtained by holding the hexagonal boron nitride powder in the thermodynamically stable region of the cubic boron nitride in the presence of the catalyst LiCaBN 2 and converting it into the cubic boron nitride powder. It is preferable that it is one.
- the D 50 (average particle size) of the cBN powder is not particularly limited, and can be, for example, 0.1 to 12.0 ⁇ m.
- the cBN powder obtained above is wet-pulverized with a ball mill (cemented carbide container, cemented carbide ball) to obtain a cBN powder having a desired average particle size.
- the D 50 (average particle size) of the cBN powder is not particularly limited, and can be, for example, 0.1 to 12.0 ⁇ m.
- the cBN powder is filled in Ta (tantalum) capsules and pressure-treated.
- the pressurizing treatment the cBN powder is pressurized at room temperature at a pressure of 3 GPa or more and 10 GPa or less for 5 minutes or more and 60 minutes or less. This increases the dislocation density of cBN.
- the cBN powder obtained above is pulverized by a high-energy ball mill equipped with an agitator arm (for example, "Atreita” (trademark) manufactured by Nippon Coke Industries Co., Ltd.). This increases the dislocation density of the cBN powder.
- an agitator arm for example, "Atreita” (trademark) manufactured by Nippon Coke Industries Co., Ltd.
- the dislocation density in the sintered body can be increased by setting the step-up speed slower.
- the binder raw material powder is a raw material powder of the bonding phase contained in the cBN sintered body.
- the binder raw material powder can be prepared, for example, as follows. 76% by weight of Ti nitride and 18% by weight of Al are mixed and heat-treated in vacuum at 1200 ° C. for 30 minutes to obtain a compound containing WC, Co and Al. The compound is pulverized to prepare a binder raw material powder.
- the method for mixing and pulverizing each powder is not particularly limited, but from the viewpoint of efficient and homogeneous mixing, mixing and pulverization with a medium such as a ball, jet mill mixing, and pulverization are preferable.
- Each mixing and pulverizing method may be wet or dry. In XRD, peaks of TiN, Ti 2 AlN, TiAl 3, etc. are confirmed in this binder raw material powder.
- the cBN powder prepared above and the binder raw material powder are mixed by using a wet ball mill mixture using ethanol, acetone or the like as a solvent to prepare a mixed powder.
- the solvent is removed by air drying after mixing. After that, heat treatment is performed to volatilize impurities such as water adsorbed on the surface of the mixed powder and clean the surface of the mixed powder.
- the binder raw material powder includes at least one metal selected from Ni, Si, Cr, Ti, V, Zr, Nb, Mo, Hf, Ta and W, and an alloy of the metals. Carbides, oxides, nitrides and carbonitrides of the metal can be included.
- the above mixed powder is filled in a container made of Ta (tantalum) in a state of being in contact with a cemented carbide disk of WC-6% Co and a Co (cobalt) foil, and vacuum-sealed.
- the vacuum-sealed mixed powder is held and sintered at 3 to 9 GPa and 1100 to 1900 ° C. for 5 to 30 minutes using a belt-type ultrahigh pressure and high temperature generator. As a result, the cubic boron nitride sintered body of the present disclosure is produced.
- LiCaBN 2 as a catalyst was mixed in a proportion of 10 parts by mass with respect to 100 parts by mass of hexagonal boron nitride powder, and held for 30 minutes under the conditions of 5 GPa and 1450 ° C. to obtain cubic boron nitride powder (cBN powder).
- cBN powder cubic boron nitride powder
- the obtained cBN powder was wet-pulverized in a ball mill (stainless steel container, stainless steel ball) for 90 hours to obtain a cBN powder having an average particle size (median diameter d50 having a diameter equivalent to a circle) of 3 ⁇ m.
- the cBN powder was filled in Ta (tantalum) capsules and pressurized at room temperature at 7 GPa for 60 minutes (pressurization treatment).
- the binder raw material powder was prepared by the following procedure. TiN powder and Al powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- the cBN powder after the pressure treatment and the binder raw material powder were mixed and uniformly mixed by a wet ball mill method using ethanol to obtain a mixed powder. Then, a degassing treatment was performed at 900 ° C. under vacuum to remove impurities such as moisture on the surface.
- the mixing ratio of the cBN powder and the binder raw material powder when producing the mixed powder is adjusted so that the ratio of the cBN particles measured by image analysis in the cubic boron nitride sintered body is 70% by volume. did.
- the mixed powder was filled in a Ta (tantal) container in a state of being in contact with the WC-6% Co superhard alloy disk and the Co (cobalt) foil, and vacuum-sealed.
- the vacuum-sealed mixed powder was boosted to 7 GPa at a step-up rate of 0.4 GPa / min using a belt-type ultrahigh-pressure high-temperature generator, held at 7 GPa and 1700 ° C. for 20 minutes, and sintered.
- a cBN sintered body of Sample 1 was obtained.
- Example 13 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- ZrN powder and Al powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- Example 14 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- HfN powder and Al powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- Example 15 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- VN powder and Al powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in a vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- Example 16 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- NbN powder and Al powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- Example 17 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- TaN powder and Al powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- Example 18 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- Example 19 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- Example 20 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- Example 21 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- TiN powder, Cr powder, Ni powder, and Co powder are mixed at a mass ratio of 85: 5: 5: 5, heat-treated at 1200 ° C. for 30 minutes in a vacuum, then mixed and pulverized with a wet ball mill to form a binder raw material. Obtained powder.
- Example 22 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- TiN powder and Si powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- Example 23 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- TiCN powder and Al powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- Example 24 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- TiO 2 powder, Nb 2 O 5 powder and carbon (C) powder are mixed in a weight ratio of 57.19: 16.79: 26.02 and heat-treated at 2100 ° C. for 60 minutes in a nitrogen atmosphere.
- a single-phase compound having a TiNbCN composition was synthesized.
- the single-phase compound was pulverized to a particle size of 0.5 ⁇ m by a wet pulverization method to obtain a TiNbCN powder.
- TiNbCN powder and Al powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- Example 25 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- TiO 2 powder, ZrO 2 powder and carbon (C) powder are mixed in a weight ratio of 58.35: 15.88: 25.77 and heat-treated at 2100 ° C. for 60 minutes in a nitrogen atmosphere.
- a single phase compound having a TiZrCN composition was synthesized. The single-phase compound was pulverized to a particle size of 0.5 ⁇ m by a wet pulverization method to obtain TiZrCN powder.
- TiZrCN powder and Al powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- Example 26 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- TiO 2 powder, HfO 2 powder and carbon (C) powder are mixed in a weight ratio of 52.45: 24.38: 23.17 and heat-treated at 2100 ° C. for 60 minutes in a nitrogen atmosphere.
- a single phase compound having a TiHfCN composition was synthesized.
- the single-phase compound was pulverized to a particle size of 0.5 ⁇ m by a wet pulverization method to obtain TiHfCN powder.
- TiHfCN powder and Al powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- Example 27 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- TiO 2 powder, Ta 2 O 5 powder and carbon (C) powder are mixed in a weight ratio of 51.467: 25.116: 23.417 and heat-treated at 2100 ° C. for 60 minutes in a nitrogen atmosphere.
- a single-phase compound having a TiTaCN composition was synthesized. The single-phase compound was pulverized to a particle size of 0.5 ⁇ m by a wet pulverization method to obtain TiTaCN powder.
- TiTaCN powder and Al powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- Example 28 A cBN sintered body was prepared in the same manner as in Sample 5, except that the binder raw material powder was changed.
- the binder raw material powder was prepared by the following procedure.
- TiO 2 powder, Cr 2 O 3 powder (manufactured by high-purity chemicals) and carbon (C) powder are mixed in a weight ratio of 62.64: 10.52: 26.84, and 2100 in a nitrogen atmosphere.
- Heat treatment was performed at ° C. for 60 minutes to synthesize a single-phase compound having a TiCrCN composition.
- the single-phase compound was pulverized to a particle size of 0.5 ⁇ m by a wet pulverization method to obtain TiCrCN powder.
- TiCrCN powder and Al powder were mixed at a mass ratio of 85:15, heat-treated at 1200 ° C. for 30 minutes in vacuum, and then mixed and pulverized with a wet ball mill to obtain a binder raw material powder.
- Example 29-Sample 34 Regarding the mixing ratio of the cBN powder and the binder raw material powder when producing the mixed powder, the volume ratio of the cBN particles in the cBN sintered body is in the "cBN particle" column of "cBN sintered body” in Tables 2 and 3.
- a cBN sintered body was prepared in the same manner as in Sample 5, except that the volume ratio was adjusted to be as described in 1.
- Example 36 A cBN sintered body was prepared in the same manner as in Sample 6 except that the cBN powder was not pressure-treated.
- Example 39 No pressure treatment was performed after cBN powder synthesis, and when the mixed powder was sintered, the pressure was increased to 7 GPa at a boost rate of 0.2 GPa / min, and the mixture was held for 5 minutes under the conditions of 7 GPa and 1700 ° C. for sintering.
- Sample 40 When synthesizing the cBN powder, the holding time under the conditions of 5 GPa and 1450 ° C. was changed to 1 minute, and the obtained cBN powder was not pulverized and pressure-treated.
- a cBN sintered body was prepared in the same manner as in Sample 6.
- composition of bound phase The composition of the bound phase in the cBN sintered body was specified by XRD. The results are shown in the "Composition” column of "Binding phase” in Tables 1 to 3.
- a cutting tool (base material shape: CNGA120408, cutting edge treatment T01215) was prepared using the cBN sintered body of each sample prepared. Using this, a cutting test was carried out under the following cutting conditions. The following cutting conditions correspond to intermittent machining of hardened steel.
- Cutting speed 120 m / min. Feed rate: 0.1 mm / rev. Notch: 0.2 mm
- the cBN sintered body of sample 33 has a volume ratio of cBN particles of less than 30% by volume, which corresponds to a comparative example.
- the cBN sintered body of sample 34 has a volume ratio of cBN particles of more than 80% by volume, which corresponds to a comparative example.
- the cBN sintered body of Sample 35 has a dislocation density of cBN particles of more than 1 ⁇ 10 20 / m 2 , which corresponds to a comparative example.
- the cBN sintered body of sample 36 has a dislocation density of cBN particles of less than 3 ⁇ 10 17 / m 2 , which corresponds to a comparative example.
- the samples 1 to 32 and the samples 37 to 40 corresponding to the examples had a longer tool life in the intermittent machining of the hardened steel than the samples 33 to 36 corresponding to the comparative examples. It is considered that this is because the samples 1 to 32 and the samples 37 to 40 corresponding to the examples have excellent strength and the fracture resistance of the tool is improved.
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Abstract
Description
前記結合相は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる単体、合金、金属間化合物からなる群より選ばれる少なくとも1種を含み、又は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる少なくとも1種の元素と、窒素、炭素、硼素及び酸素からなる群より選ばれる少なくとも1種の元素とからなる化合物、及び、前記化合物由来の固溶体からなる群より選ばれる少なくとも1種とを含み、又は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる単体、合金、金属間化合物からなる群より選ばれる少なくとも1種、並びに、周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる少なくとも1種の元素と、窒素、炭素、硼素及び酸素からなる群より選ばれる少なくとも1種の元素とからなる化合物、及び、前記化合物由来の固溶体からなる群より選ばれる少なくとも1種を含み、
前記立方晶窒化硼素粒子の転位密度は、3×1017/m2以上1×1020/m2以下である、立方晶窒化硼素焼結体である。
近年、コスト低減の観点から、焼入鋼の断続加工において長い工具寿命を有することのできる立方晶窒化硼素焼結体が望まれている。
本開示の立方晶窒化硼素焼結体は、工具材料として用いた場合に、焼入鋼の断続加工においても、工具の長寿命化を可能とすることができる。
最初に本開示の実施態様を列記して説明する。
前記結合相は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる単体、合金、金属間化合物からなる群より選ばれる少なくとも1種を含み、又は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる少なくとも1種の元素と、窒素、炭素、硼素及び酸素からなる群より選ばれる少なくとも1種の元素とからなる化合物、及び、前記化合物由来の固溶体からなる群より選ばれる少なくとも1種とを含み、又は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる単体、合金、金属間化合物からなる群より選ばれる少なくとも1種、並びに、周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる少なくとも1種の元素と、窒素、炭素、硼素及び酸素からなる群より選ばれる少なくとも1種の元素とからなる化合物、及び、前記化合物由来の固溶体からなる群より選ばれる少なくとも1種を含み、
前記立方晶窒化硼素粒子の転位密度は、3×1017/m2以上1×1020/m2以下である、立方晶窒化硼素焼結体である。
本発明者らは、まず、従来の立方晶窒化硼素焼結体を用いた工具を焼入鋼の断続加工に用いた場合、工具寿命が低下する原因について検討した。その結果、立方晶窒化硼素焼結体の強度が不足しているため、特に工具を焼入鋼の断続加工に用いた場合、強度不足による亀裂の発生により、工具寿命の低下につながっていることを新たに見出した。
本開示の一実施形態に係る立方晶窒化硼素焼結体は、30体積%以上80体積%以下の立方晶窒化硼素粒子と、20体積%以上70体積%以下の結合相と、を備える立方晶窒化硼素焼結体であって、
前記結合相は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる単体、合金、金属間化合物からなる群より選ばれる少なくとも1種を含み、又は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる少なくとも1種の元素と、窒素、炭素、硼素及び酸素からなる群より選ばれる少なくとも1種の元素とからなる化合物、及び、前記化合物由来の固溶体からなる群より選ばれる少なくとも1種とを含み、又は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる単体、合金、金属間化合物からなる群より選ばれる少なくとも1種、並びに、周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる少なくとも1種の元素と、窒素、炭素、硼素及び酸素からなる群より選ばれる少なくとも1種の元素とからなる化合物、及び、前記化合物由来の固溶体からなる群より選ばれる少なくとも1種を含み、
該立方晶窒化硼素粒子の転位密度は、3×1017/m2以上1×1020/m2以下である、立方晶窒化硼素焼結体である。
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる単体、合金、金属間化合物からなる群より選ばれる少なくとも1種を含み、又は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる少なくとも1種の元素と、窒素、炭素、硼素及び酸素からなる群より選ばれる少なくとも1種の元素とからなる化合物、及び、該化合物由来の固溶体からなる群より選ばれる少なくとも1種とを含み、又は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる単体、合金、金属間化合物からなる群より選ばれる少なくとも1種、並びに、周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群より選ばれる少なくとも1種の元素と、窒素、炭素、硼素及び酸素からなる群より選ばれる少なくとも1種の元素とからなる化合物、及び、該化合物由来の固溶体からなる群より選ばれる少なくとも1種を含む。
本開示の立方晶窒化硼素焼結体は、30体積%以上80体積%以下の立方晶窒化硼素粒子と、20体積%以上70体積%以下の結合相と、を備える。なお、cBN焼結体は、原材料、製造条件等に起因する不可避不純物を含み得る。
本開示の立方晶窒化硼素焼結体は、本開示の効果を示す範囲において不可避不純物を含んでいても構わない。不可避不純物としては、例えば、水素、酸素、炭素、アルカリ金属元素(リチウム(Li)、ナトリウム(Na)、カリウム(K)等)及びアルカリ土類金属元素(カルシウム(Ca)、マグネシウム(Mg)等)等の金属元素を挙げることができる。立方晶窒化硼素焼結体が不可避不純物を含む場合は、不可避不純物の含有量は0.1質量%以下であることが好ましい。不可避不純物の含有量は、二次イオン質量分析(SIMS)により測定することができる。
(転位密度)
本開示の立方晶窒化硼素焼結体に含まれる立方晶窒化硼素粒子の転位密度は、3×1017/m2以上1×1020/m2以下である。該立方晶窒化硼素粒子では、転位同士が3次元的に接触しているため、全方向に対する強度が向上し、耐欠損性が向上すると推察される。また、転位密度が1×1020/m2以下であると、粒子内の欠陥に由来する欠損が生じにくく、工具寿命が長くなる。
X線源:放射光
装置条件:検出器MYTHEN
エネルギー:18keV(波長:0.6888Å)
カメラ長:573mm
測定ピーク:立方晶窒化硼素の(111)、(200)、(220)、(311)、(400)、(531)の6本。ただし、集合組織、配向によりプロファイルの取得が困難な場合は、その面指数のピークを除く。
上記式(I)におけるCは、下記式(II)で表される。
上記式(II)において、らせん転位と刃状転位におけるそれぞれのコントラストファクターCh00およびコントラストファクターに関する係数qは、計算コードANIZCを用い、すべり系が<110>{111}、弾性スティフネスC11が8.44GPa、C12が1.9GPa、C44が4.83GPaとして求める。コントラストファクターCh00は、らせん転位0.203であり、刃状転位0.212である。コントラストファクターに関する係数qは、らせん転位1.65であり、刃状転位0.58である。なお、らせん転位比率は0.5、刃状転位比率は0.5に固定する。
(上記式(III)において、Reは転位の有効半径を示す。)
上記式(III)の関係と、Warren-Averbachの式より、下記式(IV)の様に表すことができ、修正Warren-Averbach法として、転位密度ρ及び結晶子サイズを求めることができる。
修正Williamson-Hall法及び修正Warren-Averbach法の詳細は、“T.Ungar and A.Borbely,“The effect of dislocation contrast on x-ray line broadening:A new approach to line profile analysis”Appl.Phys.Lett.,vol.69,no.21,p.3173,1996.”及び“T.Ungar,S.Ott,P.Sanders,A.Borbely,J.Weertman,“Dislocations,grain size and planar faults in nanostructured copper determined by high resolution X-ray diffraction and a new procedure of peak profile analysis”Acta Mater.,vol.46,no.10,pp.3693-3699,1998.”に記載されている。
本開示の立方晶窒化硼素焼結体に含まれる立方晶窒化硼素粒子は、カルシウムを0.2質量%以下含むことが好ましい。cBN粒子がカルシウムを含むと、cBN粒子中の原子空孔が低減され、cBN粒子自体の常温及び高温時の強度及び靱性が向上し、立方晶窒化硼素焼結体を用いた工具の寿命が更に向上する。
立方晶窒化硼素焼結体サンプルを密閉容器内で弗硝酸(弗酸:硝酸=5:5(体積比))に48時間浸漬する。これにより、結合相は全て弗硝酸に溶解し、cBN粒子のみが残る。該cBN粒子に対して高周波誘導プラズマ発光分析(ICP)(測定装置:サーモフィッシャーiCAP6500)を行い、cBN粒子のカルシウム含有量を定量測定する。
本開示の立方晶窒化硼素焼結体に含まれる立方晶窒化硼素粒子の円相当径のメジアン径d50(以下、「メジアン径d50」とも記す。)は、1nm以上10000nm以下が好ましく、10nm以上8000nm以下がより好ましい。これによると、立方晶窒化硼素焼結体を用いた工具は、長い工具寿命を有することができる。
結合相は、難焼結性材料であるcBN粒子を工業レベルの圧力温度で焼結可能とする役割を果たす。また、鉄との反応性がcBNより低いため、高硬度焼入鋼の切削において、化学的摩耗及び熱的摩耗を抑制する働きを付加する。また、cBN焼結体が結合相を含有すると、高硬度焼入鋼の高能率加工における耐摩耗性が向上する。
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群(以下、「群A」とも記す。)より選ばれる単体、合金、金属間化合物からなる群より選ばれる少なくとも1種を含み、又は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群(群A)より選ばれる少なくとも1種の元素と、窒素、炭素、硼素及び酸素からなる群(以下、「群B」とも記す。)より選ばれる少なくとも1種の元素とからなる化合物、及び、前記化合物由来の固溶体からなる群より選ばれる少なくとも1種とを含み、又は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群(群A)より選ばれる単体、合金、金属間化合物からなる群より選ばれる少なくとも1種、並びに、周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、コバルト及びニッケルからなる群(群A)より選ばれる少なくとも1種の元素と、窒素、炭素、硼素及び酸素からなる群(群B)より選ばれる少なくとも1種の元素とからなる化合物、及び、前記化合物由来の固溶体からなる群より選ばれる少なくとも1種を含む。すなわち、結合相は、下記の(a)~(f)のいずれかの形態とすることができる。
(b)群Aの単体、合金、金属間化合物の少なくとも1種を含む。
結合相中の結合相化合物及び結合相化合物由来の固溶体の合計含有量の下限は、50体積%が好ましく、60体積%がより好ましく、70体積%が更に好ましい。結合相中の結合相化合物及び結合相化合物由来の固溶体の合計含有量の上限は、80体積%が好ましく、90体積%がより好ましく、100体積%が最も好ましい。結合相中の結合相化合物及び結合相化合物由来の固溶体の合計含有量は50体積%以上80体積%以下が好ましく、60体積%以上90体積%以下がより好ましく、70体積%以上100体積%以下が更に好ましい。
本開示の立方晶窒化硼素焼結体は、切削工具、耐摩工具、研削工具などに用いることが好適である。
本開示の立方晶窒化硼素焼結体は、例えば下記の方法で作製することができる。
cBN粉末とは、cBN焼結体に含まれるcBN粒子の原料粉末である。cBN粉末は、特に限定されず、公知のcBN粉末を用いることができる。中でも、cBN粉末は、六方晶窒化硼素粉末を、触媒であるLiCaBN2の存在下で立方晶窒化硼素の熱力学的安定領域内で保持して、立方晶窒化硼素粉末に変換させて得られたものであることが好ましい。
結合材原料粉末とは、cBN焼結体に含まれる結合相の原料粉末である。結合材原料粉末は、例えば、次のようにして調製することができる。76重量%のTiの窒化物、18重量%のAlを混合し、真空中で1200℃、30分熱処理をして、WC、Co及びAlを含む化合物を得る。該化合物を粉砕し、結合材原料粉末を作製する。
上記で準備したcBN粉末と結合材原料粉末とを、エタノールやアセトン等を溶媒に用いた湿式ボールミル混合を用いて混合し、混合粉末を作製する。溶媒は、混合後に自然乾燥により除去される。その後、熱処理を行うことにより、混合粉末の表面に吸着した水分などの不純物を揮発させ、混合粉末の表面を清浄化する。
上記の混合粉末をWC-6%Coの超硬合金製円盤とCo(コバルト)箔とに接した状態で、Ta(タンタル)製の容器に充填して真空シールする。真空シールされた混合粉末を、ベルト型超高圧高温発生装置を用いて、3~9GPa、1100~1900℃の条件下で5~30分間保持して焼結させる。これにより、本開示の立方晶窒化硼素焼結体が作製される。
まず、立方晶窒化硼素粉末を下記の手順で準備した。
TiN粉末及びAl粉末を質量比85:15で混合し、真空中で1200℃、30分熱処理をしたのち、湿式のボールミルで混合及び粉砕して結合材原料粉末を得た。
cBN粉末に対する加圧処理条件を表1の「加圧処理」の「圧力(GPa)」及び「(時間)」欄に記載した条件に変更した以外は、試料1と同様の方法でcBN焼結体を作製した。
cBN粉末を合成する際に、5GPa、1450℃の条件下での保持時間を表1の「cBN粉末合成」の「触媒、保持時間」欄に記載した保持時間に変更した以外は、試料6と同様の方法でcBN焼結体を作製した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
結合材原料粉末を変更した以外は、試料5と同様の方法でcBN焼結体を作製した。結合材原料粉末は下記の手順で準備した。
混合粉末を作製する際のcBN粉末と結合材原料粉末との混合比率を、cBN焼結体中のcBN粒子の体積割合が表2及び表3の「cBN焼結体」の「cBN粒子」欄に記載される体積割合となるように調整した以外は、試料5と同様の方法でcBN焼結体を作製した。
cBN粉末に対して加圧処理を行わなかった以外は、試料6と同様の方法でcBN焼結体を作製した。
cBN粉末を作製する際に、触媒としてLiBN2を用い、5GPa、1450℃の条件下での保持時間を表3に記載した時間に変更した以外は、試料5と同様の方法でcBN焼結体を作製した。
cBN粉末合成後にボールミル粉砕に代えてアトライタ(使用機器:日本コークス工業社製「アトライタ」(商標)MS01SC型)粉砕(超硬合金製ボール)を10時間実施し、加圧処理を実施しなかった以外は、試料6と同様の方法でcBN焼結体を作製した。
cBN粉末合成後に加圧処理を行わず、混合粉末の焼結時に、0.2GPa/minの昇圧速度で7GPaまで昇圧し、7GPaかつ1700℃の条件下で5分間保持して焼結させた以外は、試料6と同様の方法でcBN焼結体を作製した。
(試料40)
cBN粉末を合成する際に、5GPa、1450℃の条件下での保持時間を1分に変更し、かつ、得られたcBN粉末に対して粉砕及び、加圧処理を実施しなかったこと以外は試料6と同様の方法でcBN焼結体を作製した。
(cBN焼結体の組成)
cBN焼結体におけるcBN粒子と結合相との体積比を測定した。具体的な測定方法は、上記の発明を実施するための形態に記載された方法と同一であるため、その説明は繰り返さない。各試料において、cBN焼結体におけるcBN粒子の体積比率は、表1~表3の「cBN焼結体」の「cBN粒子(体積%)」欄に示される体積比率であり、結合相の体積比率は、表1~表3の「cBN焼結体」の「結合相(体積%)」欄に示される通りであることが確認された。
cBN焼結体における結合相の組成をXRDにより特定した。結果を表1~表3の「結合相」の「組成」の欄に示す。
cBN焼結体におけるcBN粒子の転位密度を測定した。具体的な測定方法は、上記の発明を実施するための形態に記載された方法と同一であるため、その説明は繰り返さない。結果を表1~表3の「転位密度」欄に示す。
cBN焼結体におけるcBN粒子のカルシウム含有量をICP分析により測定した。具体的な測定方法は、上記の発明を実施するための形態に記載された方法と同一であるため、その説明は繰り返さない。結果を表1~表3の「cBN粒子Ca含有量」欄に示す。
作製された各試料のcBN焼結体を用いて切削工具(基材形状:CNGA120408、刃先処理T01215)を作製した。これを用いて、以下の切削条件下で切削試験を実施した。下記の切削条件は、焼入鋼の断続加工に該当する。
送り速度:0.1mm/rev.
切込み:0.2mm
クーラント:DRY
切削方法:強断続切削
旋盤:LB400(オークマ株式会社製)
被削材:被削材:SCM415、HRC58-62、φ100mm×L300mmで長手方向にU形状の溝が4本付けられた形状
評価方法:1km毎に刃先を観察し、刃先のチッピング量を測定した。チッピング量が100μm以上となる時点の切削距離を測定し、この切削距離を切削工具の寿命とした。その結果を表1~表3の「工具寿命」欄に示す。
試料1~試料32及び試料37~試料40のcBN焼結体は実施例に該当する。
Claims (6)
- 30体積%以上80体積%以下の立方晶窒化硼素粒子と、20体積%以上70体積%以下の結合相と、を備える立方晶窒化硼素焼結体であって、
前記結合相は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、鉄、コバルト及びニッケルからなる群より選ばれる1種以上の元素からなる単体、合金、金属間化合物、又は、
・周期律表の第4族元素、第5族元素、第6族元素、アルミニウム、珪素、鉄、コバルト及びニッケルからなる群より選ばれる少なくとも1種の元素と、窒素、炭素、硼素及び酸素からなる群より選ばれる少なくとも1種の元素とからなる化合物、及び、前記化合物由来の固溶体からなる群より選ばれる少なくとも1種を含み、
前記立方晶窒化硼素粒子の転位密度は、3×1017/m2以上1×1020/m2以下である、立方晶窒化硼素焼結体である、立方晶窒化硼素焼結体。 - 前記立方晶窒化硼素粒子の転位密度は、5×1017/m2以上9.5×1019/m2以下である、請求項1に記載の立方晶窒化硼素焼結体。
- 前記立方晶窒化硼素粒子は、カルシウムを0.2質量%以下含む、請求項1又は請求項2に記載の立方晶窒化硼素焼結体。
- 前記立方晶窒化硼素粒子は、カルシウムを0.17質量%以下含む、請求項3に記載の立方晶窒化硼素焼結体。
- 前記立方晶窒化硼素粒子は、カルシウムを0.15質量%以下含む、請求項4に記載の立方晶窒化硼素焼結体。
- 前記立方晶窒化硼素焼結体は、前記立方晶窒化硼素粒子を40体積%以上75体積%以下含む、請求項1から請求項5のいずれか1項に記載の立方晶窒化硼素焼結体。
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- 2019-12-16 WO PCT/JP2019/049195 patent/WO2021124403A1/ja unknown
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Publication number | Publication date |
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KR20220074930A (ko) | 2022-06-03 |
EP4079706A1 (en) | 2022-10-26 |
US11161790B2 (en) | 2021-11-02 |
EP4079706B1 (en) | 2023-12-27 |
EP4079706A4 (en) | 2022-12-07 |
CN114269711B (zh) | 2023-05-05 |
US20210246077A1 (en) | 2021-08-12 |
CN114269711A (zh) | 2022-04-01 |
JP6990320B2 (ja) | 2022-01-12 |
JPWO2021124403A1 (ja) | 2021-12-16 |
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