IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0159865
(2007-01-12)
|
등록번호 |
US-7833490
(2011-01-16)
|
우선권정보 |
EP-06447007(2006-01-12) |
국제출원번호 |
PCT/EP2007/000254
(2007-01-12)
|
§371/§102 date |
20080702
(20080702)
|
국제공개번호 |
WO07/080120
(2007-07-19)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Vesuvius Crucible Company
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
8 |
초록
▼
A crucible for the treatment of molten silicon includes a basic body with a bottom surface and lateral walls defining an inner volume. The basic body comprises at least 65% by weight of silicon carbide, and from 12 to 30% by weight of a constituent selected from silicon oxide or nitride. Moreover, t
A crucible for the treatment of molten silicon includes a basic body with a bottom surface and lateral walls defining an inner volume. The basic body comprises at least 65% by weight of silicon carbide, and from 12 to 30% by weight of a constituent selected from silicon oxide or nitride. Moreover, the basic body comprises at least one silicon oxide and/or nitride coating, at least on the surfaces defining the inner volume of the crucible.
대표청구항
▼
I claim: 1. Crucible for the treatment of molten silicon comprising a basic body with a bottom surface and lateral walls defining an inner volume, the basic body comprising at least 65% by weight of silicon carbide; from 12 to 30% by weight of a constituent selected from the group consisting of sil
I claim: 1. Crucible for the treatment of molten silicon comprising a basic body with a bottom surface and lateral walls defining an inner volume, the basic body comprising at least 65% by weight of silicon carbide; from 12 to 30% by weight of a constituent selected from the group consisting of silicon oxide and silicon nitride, the basic body further comprising a surface coating comprising a constituent selected from the group consisting of silicon oxide, silicon nitride and combinations thereof, on the surfaces defining the inner volume of the crucible. 2. Crucible according to claim 1, wherein the basic body further comprises up to 13% by weight of a constituent selected from the group consisting of carbon, magnesium oxide, aluminum oxide, calcium silicate, calcium aluminate, and combinations thereof. 3. Crucible according to claim 1, wherein a silicon oxide layer is present between the surface coating and the wall of the surfaces defining the inner volume of the crucible. 4. Crucible according to claim 1, wherein the basic body wall comprises a side opposite to a side defining the inner volume, and wherein a silicon oxide layer is present at the surface of the basic body walls, on the side opposite to the side defining the inner volume. 5. Crucible according to claim 1, wherein at least 50% by weight of the silicon carbide is comprised of grains having a particle size larger than 200 μm. 6. Crucible according to claim 1, wherein the silicon oxide or nitride is comprised of grains having a particle size lower than 10 μm. 7. Process for the manufacture of a crucible for the treatment of molten silicon comprising a basic body with a bottom surface and lateral walls defining an inner volume, the basic body comprising at least 65% by weight of silicon carbide, from 12 to 30% by weight of a constituent selected from the group consisting of silicon oxide and silicon nitride and further comprising a coating comprising a constituent selected from the group consisting of silicon oxide, silicon nitride and combinations thereof, the process comprising the following steps: a) shaping of the basic body with a bottom surface and lateral walls defining an inner volume; b) drying of the basic body; c) curing of the basic body; and d) forming a coating comprising a constituent selected from the group consisting of silicon oxide, silicon nitride and combinations thereof on the surfaces defining the inner volume of the crucible. 8. Process according to claim 7, wherein steps c) and d) are carried out simultaneously by curing the basic body in an oxidizing or nitriding atmosphere. 9. Process according to claim 7, wherein step d) of formation of the coating comprises applying the coating before the step of curing the basic body. 10. A method for the treatment of silicon, silicon alloys or silicon ores, comprising: a) providing a crucible comprising a basic body with a bottom surface and lateral walls defining an inner volume, the basic body comprising at least 65% by weight of silicon carbide, from 12 to 30% by weight of a constituent selected from the group consisting of silicon oxide, silicon nitride and combinations thereof, and further comprising a coating comprising a constituent selected from the group consisting of silicon oxide, silicon nitride and combinations thereof, on the surfaces defining the inner volume of the crucible, b) introducing a material selected from the group consisting of molten silicon, molten silicon alloy and molten silicon ore into the crucible, c) treating the material by a process selected from the group consisting of: i) crystallizing silicon by directional solidification, ii) crystallizing silicon by drawing a crystal from a molten bath, and iii) treating silicon alloy or silicon ore to eliminate impurities.
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