A composite sintered body according to the present invention contains at least cubic boron nitride and a binder. Cubic boron nitride has a continuous skeleton structure as a result of bonding of a plurality of first cubic boron nitride particles to each other. The binder has a continuous structure as a result of bonding of a plurality of binder particles to each other, that are present in a region except for a bonding interface where the first cubic boron nitride particles are bonded to each other. Second cubic boron nitride particles isolated from the first cubic boron nitride particles forming the skeleton structure are dispersed in the continuous structure of the binder particles.

Claims

15 · 2 independent · depth 4

15 granted claims

›1.independentA composite sintered body comprising:ncubic boron nitride; anda binder, wherein:said cubic boron nitride has a continuous skeleton structure as a resu…+13

›2.↳ 1The composite sintered body according to claim 1, whereinnsaid second cubic boron nitride particles are dispersed in said continuous structure at a ra…d2

›3.↳ 1The composite sintered body according to claim 1, whereinnsaid binder contains at least one of a compound and a solid solution of one or more elements…d2+3

›7.↳ 1The composite sintered body according to claim 1, wherein:nsaid binder is present at the bonding interface where said first cubic boron nitride partic…d2+1

›9.↳ 1The composite sintered body according to claim 1, whereinnsaid binder is absent at the bonding interface where said first cubic boron nitride particle…d2

›10.↳ 1The composite sintered body according to claim 1, having transverse rupture strength after acid treatment of at least 1 gf/mm2 to at most 70 kgf/mm2.d2

›11.↳ 1The composite sintered body according to claim 1, whereinnsaid cubic boron nitride is contained in said composite sintered body by at least 60 volume …d2

›12.↳ 1The composite sintered body according to claim 1, whereinntotal cubic boron nitride particles including both of said first cubic boron nitride particl…d2

›13.↳ 1The composite sintered body according to claim 1, having thermal conductivity of at least 60 W/(m·K) to at most 150 W/(m·K).d2

›14.↳ 1A cutting tool comprising the composite sintered body according to claim 1.d2

›15.independentA composite sintered body comprising:ncubic boron nitride; anda binder, wherein:said cubic boron nitride has a continuous skeleton structure as a resu…

Classifications

10 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B23B27/14

Section C — Chemistry; metallurgy

C04B35/5831
C04B35/628
C04B35/63
C04B35/645
C04B35/626
C09C1/68

USPC · US Patent Classification

51/307423/284428/206

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7.7 y

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non-final + final

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Melissa Swain

art unit 1732 · TC 1700

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20090169840 A1	2 Jul 2009

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