Power mixture and green body for producing silicon nitride base

Details Power mixture and green body for producing silicon nitride base Power mixture and green body for producing silicon nitride base

1990-10-12

1991-09-17

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 95, 501 87, 501 92, C04B 3558, C04B 3582

Patent

active

050495305

ABSTRACT:
A powder mixture and a green body for producing a silicon nitride-based article of improved fracture toughness and strength. The powder mixture includes 9a) a bimodal silicon nitride powder blend consisting essentially of about 10-30% by weight of a first silicon mitride powder of an average particle size of about 0.2 .mu.m and a surface area of about 8-12m.sup.2 g, and about 70-90% by weight of a second silicon nitride powder of an average particle size of about 0.4-0.6 .mu.m and a surface area of about 2-4 m.sup.2 /g, (b) about 10-50 percent by volume, based on the volume of the densified article, of refractory whiskers or fibers having an aspect ratio of about 3-150 and having an equivalent diameter selected to produce in the densified articel an equivalent diameter ratio of the whiskers or fibers to grains of silicon nitride of greater than 1.0, and (c) an effective amount of a suitable oxide densification aid. The green body is formed from the powder mixture, an effective amount of a suitable oxide densification aid, and an effective amount of a suitable organic binder.

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patent: 4704242 (1987-11-01), Bandyopadhyay
patent: 4840763 (1989-06-01), Freitag
patent: 4888310 (1989-12-01), Richon
Ube Industries, Ltd., "Silicon Nitride Technical Report, Data Sheet", Effect of Binary Powder Mixing.

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