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Method of manufacturing pre-sintered Si-mixture granule for porous sintered reaction-bonded silicon nitride, porous pre-sintered granule manufactured by the method, and method of manufacturing porous sintered reaction-bonded silicon nitride
US8992808B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8992808-B2 |
| Application number | US-201113220887-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 30, 2011 |
| Priority date | Jan 27, 2011 |
| Publication date | Mar 31, 2015 |
| Grant date | Mar 31, 2015 |
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Abstract
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The present invention relates to a method of manufacturing a porous pre-sintered granule for a sintered reaction-bonded silicon nitride, to which a pressure forming technology can be applied to obtain a porous sintered reaction-bonded silicon nitride having high porosity and having a structure in which macropores and micropores coexist with each other, and to a porous pre-sintered granule manufactured by the method. The method includes the steps of: granulating a raw material comprising silicon and sintering additives including yttrium, aluminum and at least one alkali earth metal compound; and pre-sintering the granulated raw material at a temperature of 1300˜1375° C. under an inert atmosphere. According to the present invention, a porous pre-sintered granule for porous sintered reaction-bonded silicon nitride, which can increase the air permeability and trapping efficiency by controlling the size of a pore channel such that macropores and micropores coexist, can be manufactured.
First claim
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What is claimed is: 1. A method of manufacturing a porous sintered reaction-bonded silicon nitride, comprising the steps of: granulating a raw material comprising silicon and sintering additive including yttrium, aluminum, and at least one alkali earth metal compound; pre-sintering the granulated raw material at a temperature of 1300˜1375° C. under an inert atmosphere to prepare porous granules; forming a compact with the porous granules; nitriding the compact under a nitrid…
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Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
- C04B35/62695Primary
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
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- What does patent US8992808B2 cover?
- The present invention relates to a method of manufacturing a porous pre-sintered granule for a sintered reaction-bonded silicon nitride, to which a pressure forming technology can be applied to obtain a porous sintered reaction-bonded silicon nitride having high porosity and having a structure in which macropores and micropores coexist with each other, and to a porous pre-sintered granule manuf…
- Who is the assignee on this patent?
- Park Young Jo, Jang Wook Kyung, Song In Hyuck, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification C04B35/62695. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Mar 31 2015 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).