Polycrystalline cubic boron nitride and method for manufacturing the same
US-2021087058-A1 · Mar 25, 2021 · US
Polycrystalline cubic boron nitride and heatsink using the same
US11845658B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11845658-B2 |
| Application number | US-202117795796-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 2, 2021 |
| Priority date | Aug 2, 2021 |
| Publication date | Dec 19, 2023 |
| Grant date | Dec 19, 2023 |
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Abstract
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A polycrystalline cubic boron nitride comprising 99.5% by volume or more of cubic boron nitride, wherein the polycrystalline cubic boron nitride has a heat conductivity of 300 W/mK or more, the polycrystalline cubic boron nitride has a carbon content of 100 ppm or more and 1000 ppm or less in terms of mass, the polycrystalline cubic boron nitride comprises a plurality of crystal grains, and the plurality of crystal grains have a median diameter d50 of an equivalent circle diameter of 0.9 μm or more and 10 μm or less.
First claim
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The invention claimed is: 1. A polycrystalline cubic boron nitride comprising 99.5% by volume or more of cubic boron nitride, wherein the polycrystalline cubic boron nitride has a heat conductivity of 300 W/mK or more, the polycrystalline cubic boron nitride has a carbon content of 100 ppm or more and 1000 ppm or less in terms of mass, the polycrystalline cubic boron nitride comprises a plurality of crystal grains, and the plurality of crystal grains have a median diameter d50 of an equivalent circle diameter of 0.9 μm or more and 10 μm or less. 2. The polycrystalline cubic boron nitride according to claim 1 , wherein the polycrystalline cubic boron nitride has a dislocation density of 4.5×10 15 /m 2 or less. 3. The polycrystalline cubic boron nitride according to claim 1 , wherein the polycrystalline cubic boron nitride has an oxygen content of 700 ppm or less in terms of mass. 4. The polycrystalline cubic boron nitride according to claim 1 , wherein the polycrystalline cubic boron nitride has a total content of an alkali metal element and an alkaline earth metal element of 10 ppm or less in terms of mass. 5. The polycrystalline cubic boron nitride according to claim 1 , wherein the polycrystalline cubic boron nitride has a heat conductivity of 500 W/mK or more. 6. The polycrystalline cubic boron nitride according to claim 1 , wherein, in an X-ray diffraction spectrum of the polycrystalline cubic boron nitride, a ratio of an X-ray diffraction intensity I (220) of the (220) plane to an X-ray diffraction intensity I (111) of the (111) plane, I (220)/I (111), is 0.10 or more and 0.30 or less. 7. The polycrystalline cubic boron nitride according to claim 2 , wherein the dislocation density is calculated by using a modified Williamson-Hall method and a modified Warren-Averbach method. 8. The polycrystalline cubic boron nitride according to claim 2 , wherein the dislocation density is measured using synchrotron radiation as an X-ray source. 9. A heatsink using the polycrystalline cubic boron nitride according to claim 1 .
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Ceramics or glasses (H10W40/254, H10W40/257, H10W40/255, H10W40/251, H10W40/253 take precedence) · CPC title
characterised by the applied pressure or type of atmosphere, e.g. in vacuum, hydrogen or a specific oxygen pressure · CPC title
Pressure sintering · CPC title
characterised by the treatment temperature · CPC title
Multi-step sintering · CPC title
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- What does patent US11845658B2 cover?
- A polycrystalline cubic boron nitride comprising 99.5% by volume or more of cubic boron nitride, wherein the polycrystalline cubic boron nitride has a heat conductivity of 300 W/mK or more, the polycrystalline cubic boron nitride has a carbon content of 100 ppm or more and 1000 ppm or less in terms of mass, the polycrystalline cubic boron nitride comprises a plurality of crystal grains, and the…
- Who is the assignee on this patent?
- Sumitomo Electric Hardmetal Corp, Sumitomo Electric Industries
- What technology area does this patent fall under?
- Primary CPC classification C01B21/064. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 19 2023 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).