Abstract
A high-temperature ceramics based on Si3N4 with an ultimate bending strength of 620 MPa at room temperature and 450 MPa at 1300°C has been developed using hot pressure casting and compression sintering. The ceramics is characterized by a high degree of crystallization of the intergrain phase and the presence of high-temperature 3Y2O3·5Al2O3 garnet in the phase composition. The microstructure of the ceramics is represented mainly by irregular grains with a maximum size of 12 μm and inclusions of elongated hexagonal crystals of Si3N4.
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References
G. Wotting and G. Ziegler, “Characterization of microstructural variables of sintered, hot-pressed and hot isostatically pressed Si3N4 and their correlation with mechanical properties,” in:Proc. 12th Int. Conf. “Science of Ceramics,” Saint Vincent, Italy, 27–30 June 1983, Vol. 12 (1983), pp. 361–370.
V. G. Verevka, I. L. Shkarupa, V. P. Paranosenkov, et al., “Mechanical properties of structural ceramic materials based on silicon nitride,”Ogneupory Tekhnich. Keramika, No. 11, 14–17 (1996).
H. Hausner, “Sintering and microstructure of non-oxide ceramics”, in:Proc. 12th Int. Conf. “Science of Ceramics”, Saint Vincent, Italy, 27–30 June 1983, Vol. 12 (1983), pp. 229–243.
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Translated from Ogneupory i Tekhnicheskaya Keramika, No. 6, pp. 20–24, June, 1997.
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Paranosenkov, V.P., Merkulova, A.V., Shkarupa, I.L. et al. Silicon nitride structural ceramics with an elevated strength at 1300°C. Refract Ind Ceram 38, 231–234 (1997). https://doi.org/10.1007/BF02768257
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DOI: https://doi.org/10.1007/BF02768257