Effect of High‐Temperature Exposure in Air on Strength of Hot‐Pressed Silicon Nitride
- 1 March 1983
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 66 (3) , C‐53-C‐55
- https://doi.org/10.1111/j.1151-2916.1983.tb10036.x
Abstract
Short‐term exposure of hot‐pressed Sl3N4 to high temperature (800°C) eradi cates the truncated strength distribution produced by room‐temperature proof‐testing, indicating that strengths after high‐temperature exposure are determined by jaws different from preexisting flaws. Since acid polishing of proof‐tested samples cycled to high temperature restored the truncated after‐proof strength distribution, it is believed that short‐term high‐temperature exposure causes amor phous SiO2 to form on the surface, thus blunting the surface flaws.Keywords
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