Spherical aluminum nitride powder
US-9073755-B2 · Jul 7, 2015 · US
Method for producing sintered aluminum nitride granules
US9403680B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9403680-B2 |
| Application number | US-201314763845-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 4, 2013 |
| Priority date | Feb 4, 2013 |
| Publication date | Aug 2, 2016 |
| Grant date | Aug 2, 2016 |
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Abstract
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A method for producing sintered aluminum nitride granules includes a reduction nitridation step of carrying out the reduction nitridation of porous alumina granules at a temperature of 1400 to 1700° C. inclusive to produce porous aluminum nitride granules; and a sintering step of sintering the porous aluminum nitride granules, which are produced in the reduction nitridation step, at a temperature of 1580 to 1900° C. inclusive.
First claim
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The invention claimed is: 1. A method for producing sintered aluminum nitride granules comprising the steps of: reductively nitrogenating porous alumina granules having an average particle size of 10 to 200 μm and a BET specific surface area of 2 to 250 m 2 /g at a temperature of 1400° C. or more and 1700° C. or less so as to obtain porous aluminum nitride granules; and sintering the porous aluminum nitride granules obtained in the step of reduction-nitridation at a temperature of 1580° C. or more and 1900° C. or less so as to obtain sintered aluminum nitride granules having an average particle size of 10 to 200 μm and a BET specific surface area of 0.05 to 0.5 m 2 /g. 2. The method for producing sintered aluminum nitride granules according to claim 1 , wherein the step of reduction-nitridation and the step of sintering are performed in a state where carbon powder is mixed with the porous alumina granules and the porous aluminum nitride granules. 3. The method for producing sintered aluminum nitride granules according to claim 1 , wherein the step of reduction-nitridation and the step of sintering are performed continuously. 4. The method for producing sintered aluminum nitride granules according to claim 1 , wherein the sintered aluminum nitride granules have a BET specific surface area of 0.05 or more to less than 0.5 m 2 /g. 5. The method for producing sintered aluminum nitride granules according to claim 1 , wherein the sintered aluminum nitride granules have a volume of pores having 2 μm or less of pore diameter of 0.2 cm 3 /g or less. 6. The method for producing sintered aluminum nitride granules according to claim 5 , wherein the sintered aluminum nitride granules have a volume of pores having 2 μm or less of pore diameter of 0.1 cm 3 /g or less. 7. The method for producing sintered aluminum nitride granules according to claim 6 , wherein the sintered aluminum nitride granules have a volume of pores having 2 μm or less of pore diameter of less than 0.01 cm 3 /g.
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Classifications
Agglomerated particles · CPC title
obtained by SEM · CPC title
Micrometer sized, i.e. from 1-100 micrometer · CPC title
with aluminium · CPC title
Surface area · CPC title
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- What does patent US9403680B2 cover?
- A method for producing sintered aluminum nitride granules includes a reduction nitridation step of carrying out the reduction nitridation of porous alumina granules at a temperature of 1400 to 1700° C. inclusive to produce porous aluminum nitride granules; and a sintering step of sintering the porous aluminum nitride granules, which are produced in the reduction nitridation step, at a temperatu…
- Who is the assignee on this patent?
- Tokuyama Corp
- What technology area does this patent fall under?
- Primary CPC classification C01B21/0726. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Aug 02 2016 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).