Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Reexamination Certificate
2007-02-13
2007-02-13
King, Roy (Department: 1742)
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
C419S066000
Reexamination Certificate
active
10413774
ABSTRACT:
A bulk silicon material for making silicon ingots, consisting of silicon pellets, and a method for making the pellets from an agglomerate-free source of high purity silicon powder by feeding a controlled amount of silicon powder that is free of intentional additives and binders into a pellet die, and dry compacting the powder at ambient temperature with pressure to produce a pellet that has a density of about 50–75% of the theoretical density of elemental silicon, a weight within a range of about 1.0 gram to about 3.0 grams and preferably of about 2.3 grams, a diameter in the range of 10 mm to 20 mm and preferably of about 14 mm, and a height in the range of 5 mm to 15 mm and preferably of about 10 mm.
REFERENCES:
patent: 4040848 (1977-08-01), Greskovich et al.
patent: 4040849 (1977-08-01), Greskovich et al.
patent: 4892694 (1990-01-01), Ritzer et al.
patent: 5073358 (1991-12-01), Shimizu et al.
patent: 5094832 (1992-03-01), Forwald et al.
patent: 5126203 (1992-06-01), Ritzer et al.
patent: 5208001 (1993-05-01), Truitt et al.
patent: 5244639 (1993-09-01), Aratani et al.
patent: 6403158 (2002-06-01), Corman
patent: 6454994 (2002-09-01), Wang
patent: 6887448 (2005-05-01), Block et al.
patent: 09002811 (1997-01-01), None
patent: 09002811 (1997-01-01), None
patent: 10203818 (1998-08-01), None
patent: 11199382 (1999-07-01), None
patent: WO 00/37719 (2000-06-01), None
O'Mara, William C., Handbook of Semiconductor Silicon Technology, 1990, pp. 81-82, Noyes Publication.
Santana, C.J., The effects of processing conditions on the density and microstructure of hot-pressed silicon powder, Journal of Materials Science, 1996, pp. 4985-4990, vol. 31.
Takatori, K., High Pressure Hot-Pressing of Silicon Powders, Journal Jap. Soc. Powder Metall., 1981, pp. 15-19, vol. 28.
Moeller, H.J., Sintering of Ultrafine Silicon Powder, Journal of the American Ceramic Society, 1985, pp. 320-325, vol. 68, No. 6.
Greskovich, C., The effect of small amounts of B and Sn on the sintering of silicon, Journal of Materials Science, 2981, pp. 613-619, vol. 16.
Moeller, H.J., Sintering of Silicon, Abstract from Conference Paper, 1982, Network GmbH, Wunstorf, West Germany.
Chandra Mohan
Gupta Kedar P
Hariharan Alleppey V
GT Solar Incorporated
King Roy
Maine & Asmus
McNelis Kathleen
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