DRY CONVERSION OF HIGH PURITY ULTRAFINE SILICON POWDER TO DENSIFIED PELLET FORM FOR SILICON MELTING APPLICATIONS
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United States of America Patent
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app pub date -
Oct 21, 2010
filing date -
Apr 15, 2002
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Abandoned
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Abstract
A method for making bulk silicon material consisting of silicon pellets for making silicon ingots from an agglomerate-free source of high purity, ultra fine silicon powder includes feeding a controlled amount of silicon powder into a pellet die and dry compacting the powder at ambient temperature with pressure to produce a pellet that has a density of about 50-85% of the theoretical density of elemental silicon, a weight within a range of about 1.0 gram to about 3.0 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.
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