High-packing silicon nitride powder and method for making

Details High-packing silicon nitride powder and method for making High-packing silicon nitride powder and method for making

1993-06-15

1994-09-20

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 94, 501 96, 501154, 423344, 423349, 423409, C04B 3558

Patent

active

053489195

ABSTRACT:
High-packing silicon nitride powder is prepared by reacting metallic silicon powder having a mean particle size of 1 to 10 .mu.m and a purity of at least 99% directly with nitrogen for forming silicon nitride powder, milling the silicon nitride powder in a dry attritor until the tap density exceeds 0.9 g/cm.sup.3 and the content of particles having an aspect ratio of up to 3 exceeds 95% by weight, and further milling the silicon nitride powder in a wet attritor for finely dividing coarse particles having a particle size of at least 2 .mu.m. The silicon nitride powder has a tap density of at least 0.9 g/cm.sup.3 and a mean particle size of 0.4 to 0.6 .mu.m and contains at least 95% by weight of particles having an aspect ratio of up to 3 and up to 5% by weight of coarse particles having a particle size of at least 2 .mu.m. The powder is moldable into a high density compact, from which a sintered part having improved dimensional precision and strength is obtained.

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Derwent Publications Ltd. AN 93-121039 and JP A 5 058 606, (1993).
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Derwent Publications Ltd. AN 91-326188 and DD-A 290 860 (1991).

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