JP6755239B2 - 焼結体およびそれを含む切削工具 - Google Patents
焼結体およびそれを含む切削工具 Download PDFInfo
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- JP6755239B2 JP6755239B2 JP2017514149A JP2017514149A JP6755239B2 JP 6755239 B2 JP6755239 B2 JP 6755239B2 JP 2017514149 A JP2017514149 A JP 2017514149A JP 2017514149 A JP2017514149 A JP 2017514149A JP 6755239 B2 JP6755239 B2 JP 6755239B2
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- 238000005520 cutting process Methods 0.000 title claims description 56
- 239000000463 material Substances 0.000 claims description 132
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 116
- 239000002245 particle Substances 0.000 claims description 81
- 229910052582 BN Inorganic materials 0.000 claims description 22
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 22
- 239000013078 crystal Substances 0.000 claims description 16
- 150000001875 compounds Chemical class 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 4
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052796 boron Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 3
- 229910021480 group 4 element Inorganic materials 0.000 claims description 3
- 229910021478 group 5 element Inorganic materials 0.000 claims description 3
- 229910021476 group 6 element Inorganic materials 0.000 claims description 3
- 229910000449 hafnium oxide Inorganic materials 0.000 claims description 3
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 2
- 239000000843 powder Substances 0.000 description 40
- 238000000034 method Methods 0.000 description 34
- 238000005245 sintering Methods 0.000 description 19
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 16
- 230000007423 decrease Effects 0.000 description 16
- 239000000203 mixture Substances 0.000 description 14
- 238000012545 processing Methods 0.000 description 10
- 239000006104 solid solution Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 239000002243 precursor Substances 0.000 description 9
- 239000002994 raw material Substances 0.000 description 8
- 238000001941 electron spectroscopy Methods 0.000 description 7
- 238000006386 neutralization reaction Methods 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 238000000975 co-precipitation Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 238000000921 elemental analysis Methods 0.000 description 5
- 238000010884 ion-beam technique Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011268 mixed slurry Substances 0.000 description 4
- 238000004663 powder metallurgy Methods 0.000 description 4
- 238000003980 solgel method Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 150000003746 yttrium Chemical class 0.000 description 3
- 229910052727 yttrium Inorganic materials 0.000 description 3
- 150000003754 zirconium Chemical class 0.000 description 3
- 229910052726 zirconium Inorganic materials 0.000 description 3
- OBOSXEWFRARQPU-UHFFFAOYSA-N 2-n,2-n-dimethylpyridine-2,5-diamine Chemical compound CN(C)C1=CC=C(N)C=N1 OBOSXEWFRARQPU-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- -1 etc.) Inorganic materials 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000010191 image analysis Methods 0.000 description 2
- CMOAHYOGLLEOGO-UHFFFAOYSA-N oxozirconium;dihydrochloride Chemical compound Cl.Cl.[Zr]=O CMOAHYOGLLEOGO-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 2
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 2
- NGDQQLAVJWUYSF-UHFFFAOYSA-N 4-methyl-2-phenyl-1,3-thiazole-5-sulfonyl chloride Chemical compound S1C(S(Cl)(=O)=O)=C(C)N=C1C1=CC=CC=C1 NGDQQLAVJWUYSF-UHFFFAOYSA-N 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007909 melt granulation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 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
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- UJVRJBAUJYZFIX-UHFFFAOYSA-N nitric acid;oxozirconium Chemical compound [Zr]=O.O[N+]([O-])=O.O[N+]([O-])=O UJVRJBAUJYZFIX-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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- C04B35/48—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 zirconium or hafnium oxides, zirconates, zircon or hafnates
- C04B35/486—Fine ceramics
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- C04B35/4885—Composites with aluminium oxide
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Description
最初に本発明の実施態様を列記して説明する。
以下、本発明の実施形態(以下「本実施形態」とも記す)についてさらに詳細に説明する。
従来、cBNと、Al2O3およびZr化合物等とを含んだ焼結体は、それを切削工具として用いた場合、遠心鋳造鋳鉄の高速切削において良好な耐摩耗性を有することが知られていた。しかし、Al2O3は低靭性材料であるため、高速の長距離切削に用いた際、欠損する場合があり課題とされていた。
<第1材料>
第1材料は、5〜90体積%のAl2O3が結晶粒界または結晶粒内に分散した部分安定化ZrO2である。換言すれば、第1材料は、5〜90体積%のAl2O3が部分安定化ZrO2の結晶粒界または結晶粒内に分散した複合酸化物である。
中和共沈法とは、以下の工程Aおよび工程Bを含む方法である。このような方法は、たとえば2013年に発表された論文(J. Jpn. Soc. Powder Powder Metallurgy,Vol.60,No.10,P428-435)に記載されている。
ゾル−ゲル法とは、以下の工程Xを含む方法である。このような方法は、たとえば2011年に発表された論文(J. Jpn. Soc. Powder Powder Metallurgy,Vol.58,No.12,P727-732)に記載されている。
本実施形態の第1材料は、上記の2方法以外の方法によっても得ることができる。すなわち、部分安定化ZrO2とAl2O3とをビーズミルまたはボールミルのような粉砕機を用いてエタノール等の溶媒中で混合しスラリーを得る。次いで、このスラリーを用いて造粒することにより第1材料を得ることができる。造粒手段は特に限定されず、溶融造粒、噴霧造粒等を挙げることができる。
(1)熱処理炉(たとえば1000℃、真空中、3時間)で焼結する。
(2)造粒物の前駆段階の上記スラリーにバインダー(たとえば一般的バインダーであるPVB(ポリビニルブチラール))を10質量%添加する。
本実施形態の焼結体に含まれる立方晶窒化ホウ素は、0.1〜5μmの平均粒径を有することが好ましい。0.1μm未満の場合、他の粉末と混合する際、凝集しやすいため焼結不良となる傾向があり、5μmを超えると、焼結時粒成長により強度が低下する傾向がある。
本実施形態の焼結体は、上記の第1材料および立方晶窒化ホウ素以外に、さらに第3相を含むことができる。このような第3相は、酸化アルミニウム、酸化マグネシウム、酸化セリウム、酸化イットリウム、酸化ハフニウム、およびZrOからなる群より選ばれる少なくとも1種であることが好ましい。焼結体がこのような第3相を含むことにより、焼結性が向上し、焼結体の強度がさらに向上する。
本実施形態の焼結体は、上記の第1材料および立方晶窒化ホウ素以外に、さらに第4相を含むことができる。第4相は、上記の第3相とともに焼結体中に含まれていても良い。
本実施形態の焼結体は、従来公知の製造方法により製造することができ、特にその製造方法が限定されるものではない。
本実施形態の焼結体は、上記のように優れた耐欠損性、耐摩耗性等の特性を示すため切削工具などに用いることが好適である。すなわち、本実施形態の切削工具は、上記の焼結体を含むものである。
原料として、60体積%のcBNと40体積%の第1材料とを準備した。cBNは平均粒径2μmであり、第1材料は下記のように中和共沈法により作製されたものであって、第1材料全体に対して30体積%のAl2O3が固溶した部分安定化ZrO2であり、粒径は0.01μmであった。
第1材料は、前述の通り、2013年に発表された論文(J. Jpn. Soc. Powder Powder Metallurgy,Vol.60,No.10,P428-435)に基づき下記の方法により作製できる。
切削速度:900m/min
送り:0.2mm
切込み:0.3mm
湿式/乾式:湿式(クーラント:エマルジョン)
装置:LB4000(オークマ社製)
被削材:遠心鋳造鋳鉄(緻密パーライト、デンドライト組織等を有するFC250(ネズミ鋳鉄))
被削材の形状:円筒状(外径φ95mm)
(切削試験)
10.0km切削後の逃げ面摩耗量(μm)を測定するとともに、12.0km切削後の摩耗形態および欠損状況を観察した。その結果を表1に示す。
上記で準備した第1材料(前駆体)のみを用いて、焼結温度を表1記載の温度とすることを除き、他は全て上記と同様にして焼結体No.7〜焼結体No.10の4種の焼結体を得た。そして上記と同様にして切削試験を行なった。
焼結体中の第1材料の含有量を以下の表2の通り変更することを除き、他は全て実施例1の焼結体No.3(すなわち焼結温度が1500℃のもの)と同様にして、7種類の焼結体を作製した(焼結体No.3a、No.3b、No.3c、No.3d、No.3e、No.3f、No.3g)。
<実施例3>
第1材料中のAl2O3の含有量を以下の表3の通り変更することを除き、他は全て実施例1の焼結体No.3と同様にして、7種類の焼結体を作製した(焼結体No.3t、No.3u、No.3v、No.3w、No.3x、No.3y、No.3z)。
焼結体中の第1材料(含有量:40体積%)を、23体積%の第1材料と17体積%の表4記載の第3相および/または第4相とに置き換えることを除き、他は全て実施例1の焼結体No.3と同様にして、24種類の焼結体を作製した(焼結体No.301〜No.324)。
<実施例5>
焼結体中の第1材料(含有量:40体積%)を、以下の第1材料(1)〜第1材料(6)にそれぞれ置き換えることを除き、他は全て実施例1の焼結体No.3と同様にして、6種類の焼結体を作製した。
部分安定化ZrO2粉末(商品名:「TZ−3Y」、東ソー製、平均粒径:45nm)とAl2O3粉末(商品名:「TM−DAR」、大明化学製、平均粒径:0.1μm)とを、溶媒(エタノール)中でボールミルを用いて混合し、混合スラリーを得た。なお、両粉末の混合割合は、焼結体中での含有割合がZrO2が34体積%、Al2O3が6体積%(第1材料中に占める割合:15体積%)となるように混合した。
部分安定化ZrO2粉末とAl2O3粉末とを、焼結体中での含有割合がZrO2が28体積%、Al2O3が12体積%(第1材料中に占める割合:30体積%)となるように混合することを除き、他は全て第1材料(1)と同様にして第1材料(2)を得た。
部分安定化ZrO2粉末とAl2O3粉末とを、焼結体中での含有割合がZrO2が20体積%、Al2O3が20体積%(第1材料中に占める割合:50体積%)となるように混合することを除き、他は全て第1材料(1)と同様にして第1材料(3)を得た。
部分安定化ZrO2粉末(商品名:「TZ−3Y」、東ソー製、平均粒径:45nm)とAl2O3粉末(商品名:「TM−DAR」、大明化学製、平均粒径:0.1μm)とを、バインダーとしてポリビニルブチラール(商品名:「エスレックB」、積水化学工業株式会社製)を10質量%添加した溶媒(エタノール)中でボールミルを用いて混合し、混合スラリーを得た。なお、両粉末の混合割合は、焼結体中での含有割合がZrO2が34体積%、Al2O3が6体積%(第1材料中に占める割合:15体積%)となるように混合した。
部分安定化ZrO2粉末とAl2O3粉末とを、焼結体中での含有割合がZrO2が28体積%、Al2O3が12体積%(第1材料中に占める割合:30体積%)となるように混合することを除き、他は全て第1材料(4)と同様にして第1材料(5)を得た。
部分安定化ZrO2粉末とAl2O3粉末とを、焼結体中での含有割合がZrO2が20体積%、Al2O3が20体積%(第1材料中に占める割合:50体積%)となるように混合することを除き、他は全て第1材料(4)と同様にして第1材料(6)を得た。
<実施例6>
焼結体中の第1材料を、以下のようにして作製した第1材料(この第1材料を便宜上「第1材料A」とする)に置き換えること(すなわち焼結体原料の第1材料前駆体を以下の「第1材料A」に置き換えること)を除き、他は全て実施例1の焼結体No.3と同様にして、焼結体を作製した(この焼結体を便宜上「焼結体No.601」とする)。
第1材料Aは、前述の通り、2011年に発表された論文(J. Jpn. Soc. Powder Powder Metallurgy,Vol.58,No.12,P727-732)に基づき下記の方法(ゾル−ゲル法)により作製できる。
以上のように本発明の実施の形態および実施例について説明を行なったが、上述の各実施の形態および実施例の構成を適宜組み合わせたり、様々に変形することも当初から予定している。
Claims (11)
- 第1材料と立方晶窒化ホウ素とを含む焼結体であって、
前記第1材料は、5〜90体積%のAl2O3が結晶粒界または結晶粒内に分散した部分安定化ZrO2である、焼結体。 - 前記第1材料は、5〜50体積%のAl2O3が結晶粒界または結晶粒内に分散した部分安定化ZrO2である、請求項1に記載の焼結体。
- 前記第1材料は、50体積%超70体積%以下のAl2O3が結晶粒界または結晶粒内に分散した部分安定化ZrO2である、請求項1に記載の焼結体。
- 前記第1材料は、70体積%超90体積%以下のAl2O3が結晶粒界または結晶粒内に分散した部分安定化ZrO2である、請求項1に記載の焼結体。
- 前記Al2O3は、その粒径が1μm以下の粒子である、請求項1〜請求項4のいずれか1項に記載の焼結体。
- 前記Al2O3は、その粒径が0.5μm以下の粒子である、請求項5に記載の焼結体。
- 前記Al2O3は、その粒径が0.1μm以下の粒子である、請求項6に記載の焼結体。
- 前記焼結体は、20〜80体積%の前記第1材料を含む、請求項1〜請求項7のいずれか1項に記載の焼結体。
- 前記焼結体は、さらに第3相を含み、
前記第3相は、酸化アルミニウム、酸化マグネシウム、酸化セリウム、酸化イットリウム、酸化ハフニウム、およびZrOからなる群より選ばれる少なくとも1種である、請求項1〜請求項8のいずれか1項に記載の焼結体。 - 前記焼結体は、さらに第4相を含み、
前記第4相は、周期表の4族元素、5族元素、6族元素、Al、およびSiからなる群より選ばれる少なくとも1種の元素と、炭素、窒素、およびホウ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少なくとも1種の化合物である、請求項1〜請求項9のいずれか1項に記載の焼結体。 - 請求項1〜請求項10のいずれか1項に記載の焼結体を含む切削工具。
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