Pressureless Sintering of Si 3 N 4 Ceramic Using AlN and Rare‐Earth Oxides
Authors:
- 1 May 1997
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 80 (5) , 1256-1262
Abstract
Using intermediate, liquid‐forming compositions in the (Y,La) 2 O 3 ‐AlN system as additives, fully dense Si 3 N 4 ceramics with high strength at high temperature have been obtained by pressureless sintering. The ceramics contain rod‐shaped β‐Si 3 N 4 with M′ or K′ solid solutions as grain‐boundary phases. The strength of these ceramics is 1150 MPa at 1200°C, and the room‐temperature toughness is maintained at }7 MPa·m 1/2 . Phase relations that are pertinent to the new additive compositions are delineated to rationalize their beneficial effects on sinterability and mechanical properties.Keywords
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