Silicon nitride sintered materials

Details Silicon nitride sintered materials Silicon nitride sintered materials

1990-07-19

1991-07-09

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 97, C04B 3558

Patent

active

050305999

ABSTRACT:
A sintered silicon nitride product is made having a high flexural strength by sintering a mixture of silicon nitride and a sintering aid containing alumina and at least a three component rare earth oxide mixture which does not contain yttria. Based on the weight of the final sintered nitride product, the three component rare earth oxide mixture comprises about 3 to 6% La.sub.2 O.sub.3, 2 to 5% Nd.sub.2 O.sub.3, and 1 to 4 CeO.sub.2. An additional fourth component, Pr.sub.6 O.sub.11, can be added in an amount of 0.5 to 1.1%.

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S. Hampshire and K. H. Jack in "Progress in N.sub.2 Ceramics" edited by F. L. Riley, Series E, No. 65 at pp. 225-230.
C. L. Quackenbush and J. T. Smith, GTE Laboratories, Waltham, Mass., "GTE Sintered Silicon Nitride" (ASME 84-GT-228).

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