Abstract
The microstructure-properties relationship of nitride-bonded SiC refractories has been studied in the presence of Si and urea additives. The samples were prepared by mixing, shaping, and firing at 1450 to 1600°C in a controlled atmosphere. Physical properties were evaluated by measuring density, porosity, and cold crushing strength (CCS). XRD, SEM, and TEM were employed to study the phase and microstructural evolution. The increase of Si enhanced the bond formation, which contributed to density and strength improvement. The firing temperature had the same effect up to 1550°C. At 1600°C, however, the density and CCS decreased, which were attributed to nitride phase decomposition. The urea addition improved the mechanical properties and increased the depth of nitridation.
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References
K. A. Schwetz (ESK-GmbH), “Silicon carbide and its high technology Ceramics,” Radex Rundschau, No. 1, 26–38 (1989).
R. W. Brown, D. F. Steele, H. Oberbanscheidt, B. H. Bates, and M. O. Parker, “Bond developments in silicon carbide blast furnace refractories during the 1980’s,” Aachen Proc., 41–46 (1988).
A. A. Nourbakhsh, F. Golestani-Fard, and H. R. Rezaie, “Influence of additives on microstructural changes in nitride bonded SiC refractories,” J. Eur. Ceram. Soc., 26, 1737–1741 (2006).
Lin Yulian and Liu Shengqiu, Manufacture, Properties and Application of Silicon carbide Refractories, InternationalWorkshop on Technology and Development of Refractories, China (1994).
I. S. Kim, E. H. Kim, B. G. Suh, and Y. S. Choi, Influence of additives on Nitridation of metallic Silicon in Si 3 N 4-bonded SiC, UNITECR, Japan, (1987).
M. P. Albano, A. N. Scian, and E. Pereira, “Mechanical Sterngth of Si3N4-Bonded SiC Refractories,” Interceram., 43(3), 162–167 (1994).
H. J. Hannink, “The development of microstructure in silicon nitride bonded silicon carbide,” J. Eur. Cer Am. Soc., 15(5), 415–424 (1995).
I. R. Ruiz, A. H. Bressiani, and J. C. Bressiani, “Use of rare earth concentrates as a sialon sintering additives,” Mater. Sci. Forum, 141–148 (1999).
K. H. Jack, “Review of sialons and related nitrogen ceramics,” J. Mater. Sci, No. 11, 1135–1158 (1976).
A. A. Nourbakhsh, H. R. Rezaei, S. M. Hejazi, A. R. Hanifi, and F. Golestani-Fard, “Nitride bonding modification via utilizing of oxide and urea additives in SiC based refractories,” in: 45th International Colloquim on Refractories (2002), pp. 30–34.
G. Woetting, B. Kanika, and G. Ziegler, “Microstructural development, microstructural characterization and relation to mechanical properties of dense silicon nitride,” in: International Conference on Non-Oxide Technical and Engineering Ceramics (1985).
E. M. Levin, C. R. Robbins, and H. F. McMurdie, “Phase diagrams for ceramists,” Am. Ceram. Soc. (1969).
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Translated from Novye Ogneupory, No. 10, pp. 68–72, October 2007.
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Nourbakhsh, A.A., Golestani-fard, F. & Rezaie, H.R. The effect of Si content, firing temperature, and urea additive on the properties of nitride-bonded SiC refractories. Refract Ind Ceram 48, 383–386 (2007). https://doi.org/10.1007/s11148-007-0100-y
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DOI: https://doi.org/10.1007/s11148-007-0100-y