Ceramic phase in sintered silicon nitride containing cerium, alu

Details Ceramic phase in sintered silicon nitride containing cerium, alu Ceramic phase in sintered silicon nitride containing cerium, alu

1990-07-24

1992-01-07

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 97, 423353, C04B 3556, C04B 3558

Patent

active

050791982

ABSTRACT:
A body of sintered silicon nitride contains new non-glassy phases which produce significant X-ray diffraction peaks at 2-theta diffraction angles corresponding to d-spacings of about 2.86 Angstroms and 3.59 Angstroms and process for making same, which process includes (a) comminuting a slurry of a silicon-containing powder, water, about 0.1 to 5 volume percent of Fe.sub.2 O.sub.3, about 0.1 to 5 volume percent Al.sub.2 O.sub.3, and about 0.5 to 10 volume percent CeO.sub.2, wherein all volume percents are based on the volume of the resultant silicon nitride, the composition of the slurry being such that about a 4 to 12 volume percent liquid phase is achieved during sintering; (b) reducing the water content of the reacted slurry to form a dry mass; (c) nitriding the dry mass by exposure to a nitriding gas at an elevated temperature to form silicon nitride; and (d) sintering the silicon nitride at about 1450.degree.-2100.degree. C.

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