Microstructure and Properties of Self-Reinforced Silicon Nitride |
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| Authors: | Aleksander J. Pyzik Donald R. Beaman |
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| Affiliation: | Central Research &Development, Advanced Ceramics Laboratory and Analytical Sciences, The Dow Chemical Company, Midland, Michigan 48674 |
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| Abstract: | Problems associated with manufacturing Si3N4/SiC-whisker composites have been overcome by developing selfreinforced Si3N4 with elongated β-Si3N4 grains formed in situ from oxynitride glass. This Si3N4–Y2O3–MgO–SiO2–CaO-based material has a flexure strength >1000 MPa and fracture toughness >8 MPa·m½. The optimum combination of mechanical properties has been obtained with Y2O3:MgO ratios ranging from 3:1 to 1:2, CaO contents ranging from 0.1 to 0.5 wt%, and Si3N4 contents between 90 and 96 wt%. |
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