High-Temperature Mechanical Properties and Microstructures for Hot-Pressed Silicon Nitrides with Amorphous and Crystalline Intergranular Phases |
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| Authors: | Sarah H. Knickerbocker Avigdor Zangvil Sherman D. Brown |
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| Affiliation: | Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 |
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| Abstract: | Four-point flexure tests were performed at 1100° to 1350°C on two hot-pressed silicon nitrides, one in which the grain-boundary phase was amorphous and one in which it was largely crystalline. Fracture stress and relative K1c were plotted vs temperature. Fracture regions were analyzed by scanning and transmission electron microscopy. Grain-boundary phases affected high-temperature fracture significantly. |
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