Polycrystalline cubic boron nitride and method for manufacturing the same
US-2020247673-A1 · Aug 6, 2020 · US
Composite sintered material and tool using same
US11319255B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11319255-B2 |
| Application number | US-202017280939-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 18, 2020 |
| Priority date | Mar 18, 2020 |
| Publication date | May 3, 2022 |
| Grant date | May 3, 2022 |
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Abstract
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A composite sintered material includes: cubic boron nitride grains; and hexagonal boron nitride grains or the hexagonal boron nitride grains and wurtzite type boron nitride grains, wherein a dislocation density of the cubic boron nitride grains is more than or equal to 1×10 15 /m 2 and less than or equal to 1×10 17 /m 2 , a median diameter d50 of equivalent circle diameters of the cubic boron nitride grains is more than or equal to 10 nm and less than or equal to 500 nm, and a relationship of the following expression 1 is satisfied: 0.015≤( Vh+Vw )/( Vc+Vh+Vw )≤0.5, Expression 1: where Vc represents a volume-based content ratio of the cubic boron nitride grains, Vh represents a volume-based content ratio of the hexagonal boron nitride grains, and Vw represents a volume-based content ratio of the wurtzite type boron nitride grains.
First claim
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The invention claimed is: 1. A composite sintered material comprising: cubic boron nitride grains; and hexagonal boron nitride grains or the hexagonal boron nitride grains and wurtzite type boron nitride grains, wherein a dislocation density of the cubic boron nitride grains is more than or equal to 1×10 15 /m 2 and less than or equal to 1×10 17 /m 2 , a median diameter d50 of equivalent circle diameters of the cubic boron nitride grains is more than or equal to 10 nm and less than or equal to 500 nm, and a relationship of the following expression 2 is satisfied: 0.03≤( Vh+Vw )/( Vc+Vh+Vw )≤0.4, Expression 2: where Vc represents a volume-based content ratio of the cubic boron nitride grains, Vh represents a volume-based content ratio of the hexagonal boron nitride grains, and Vw represents a volume-based content ratio of the wurtzite type boron nitride grains. 2. The composite sintered material according to claim 1 , wherein the dislocation density of the cubic boron nitride grains is more than or equal to 1×10 15 /m 2 and less than or equal to 3×10 16 /m 2 . 3. The composite sintered material according to claim 1 , wherein the dislocation density of the cubic boron nitride grains is more than or equal to 1×10 15 /m 2 and less than or equal to 5×10 15 /m 2 . 4. The composite sintered material according claim 1 , wherein the median diameter d50 of the equivalent circle diameters of the cubic boron nitride grains is more than or equal to 10 nm and less than or equal to 300 nm. 5. The composite sintered material according to claim 1 , wherein the median diameter d50 of the equivalent circle diameters of the cubic boron nitride grains is more than or equal to 10 nm and less than or equal to 100 nm. 6. The composite sintered material according to claim 1 , wherein a total content of an alkali metal element and an alkaline earth metal element in the composite sintered material is less than or equal to 10 ppm on a mass basis. 7. The composite sintered material according to claim 1 , wherein the dislocation density is calculated using a modified Williamson-Hall method and a modified Warren-Averbach method. 8. The composite sintered material according to claim 1 , wherein the dislocation density is measured using synchrotron radiation as an X-ray source. 9. A tool comprising the composite sintered material recited in claim 1 . 10. The composite sintered material according to claim 1 , wherein the composite sintered material contains the hexagonal boron nitride grains and the wurtzite type boron nitride grains.
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Phases present in the sintered or melt-cast ceramic products other than the main phase · CPC title
Submicron sized grains, i.e. from 0,1 to 1 micron · CPC title
Nanograined materials, i.e. having grain sizes below 100 nm · CPC title
Cubic symmetry, e.g. beta-SiC · CPC title
Multi-step sintering · CPC title
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- What does patent US11319255B2 cover?
- A composite sintered material includes: cubic boron nitride grains; and hexagonal boron nitride grains or the hexagonal boron nitride grains and wurtzite type boron nitride grains, wherein a dislocation density of the cubic boron nitride grains is more than or equal to 1×10 15 /m 2 and less than or equal to 1×10 17 /m 2 , a median diameter d50 of equivalent circle diameters of the cubic boron …
- Who is the assignee on this patent?
- Sumitomo Electric Hardmetal Corp
- What technology area does this patent fall under?
- Primary CPC classification C04B35/5831. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 03 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).