β‐Sialon Ceramics Prepared at 1700°C by Hot Isostatic Pressing
- 1 September 1989
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 72 (9) , 1722-1724
- https://doi.org/10.1111/j.1151-2916.1989.tb06311.x
Abstract
Dense, single‐phase β‐sialon ceramics were sintered at 1700°C and 200 MPa using the glass‐encapsulated hot isostatic pressing technique. The materials were very hard, 1500 to 1700 kg / mm2 (98 N load), but were fairly brittle, with an indention fracture toughness of about 3 MPa · m1/2. The addition of 1 wt% Y2O3 before sintering had a positive effect on the toughness, especially at the low x compositions of Si3‐xAlxOxN4‐x, where KIC∼4 MPa · m1/2.Keywords
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