Abstract
Si3N4-barium aluminum silicate (BAS) self-reinforced composites have been prepared by pressureless sintering at 1800 °C for 2 h. The β-Si3N4 seeds incorporated in the starting α-Si3N4 powders encouraged the α- to β-Si3N4 phase transformation, and the final bimodal microstructure with large grains, consequently, led to the improvement of the fracture toughness, from 7.74 to 8.34 MPa m1/2. The almost-complete crystallized BAS benefited the high-temperature mechanical properties. The residual stress, crack deflection, grain bridging, and pullout were considered as the major toughening mechanisms in this composite.
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The authors wish to express thanks the financial support of the State Education Ministry of the People’s Republic of China (RFDP Program (20060698008)).
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Wang, B., Yang, J., Guo, R. et al. Microstructure and property enhancement of silicon nitride-barium aluminum silicate composites with β-Si3N4 seed addition. J Mater Sci 44, 1351–1356 (2009). https://doi.org/10.1007/s10853-008-3009-z
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DOI: https://doi.org/10.1007/s10853-008-3009-z