Abstract
β-SiC powders were synthesised by carbothermic reduction of carbon-black doped silica gel. The morphological characteristics of the resulting powders depend on the morphology of precursor carbon black as well as the reaction conditions. A model for particle coarsening during carbothermic reduction is presented, suggesting that surface diffusion may be responsible for the formation of polycrystalline aggregates, while at higher reaction temperatures volume diffusion is operative. Processing consisting of decarburization, HF treatment and sedimentation but no milling is required to convert crude reaction products into sinterable powders. After doping with boron and carbon they can be sintered to 98–99% of theoretical density which, in general, is better than or comparable to results obtained with commercial β-SiC powders which were also included in the present study.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
K. Kijima and M. Konishi, J. Ceram. Soc. Jpn 93 (1985) 511.
W. R. Cannon, S. C. Danforth, J. H. Flint, J. S. Haggerty and R. A. Marra, J. Amer. Ceram. Soc. 65 (1982) 324.
G. C. Wei, Commun. J. Amer. Ceram. Soc. 66 (1983) C-111.
P. T. B. Shaffer and K. A. Blakely, in “Advances in Ceramics”, Vol. 21 (American Ceramic Society, Westerville, 1987) p. 257.
G. C. Wei, C. R. Kennedy and L. A. Harris, Amer. Ceram. Soc. Bull. 63 (1984) 1054.
K. A. Schwetz and A. Lipp, Radex-Rundschau 2 (1978) 489.
N. Murakawa, M. Nakajima, K. Maruyama, K. Isogaya and K. Yoshida, “High Tech. Ceramics” (Elsevier, Amsterdam, 1987) p. 501.
P. Kennedy and B. North, in Proceedings of the British Ceramic Society, No. 33, edited by D. Taylor (British Ceramic Society, Stoke-on-Trent, 1983) p. 3.
H. Tanaka and Y. Kurachi, Ceram. Int. 14 (1988) 109.
K. A. Schwetz and J. Hassler, J. Less-Common Met. 117 (1986) 7.
J. Rottmann and F. Schleifer, “Gase in Metallen” (DGM, Köln, 1982) p. 343.
J. L. Blumenthal, M. J. Santy and E. A. Burns, AIAA J. 4 (1966) 1053.
C. Greskovich and J. H. Rosolowski, J. Amer. Ceram. Soc. 59 (1976) 336.
P. Elder and V. D Krstić, J. Mater. Sci. Lett. 8 (1989) 941.
R. Pampuch and K. Haberko, “Ceramic Powders” (Elsevier, Amsterdam, 1983) p. 623.
G. A. Bootsma, W. F. Knippenberg and G. Verspni, J. Cryst. Growth 8 (1971) 341.
J. Brunestad, C. E. Bamberger, D. E. Heartherly and J. F. Land, Commun. J. Amer. Ceram. Soc. 67 (1984) 184.
P. Matje and K. A. Schwetz, “Ceramic Powder Processing Science” (DKG, Köln, 1989) p. 377.
M. Hashiba, H. Okamoto, Y. Nurishi and K. Hiramatsu, J. Mater. Sci. 23 (1988) 2893.
E. Carlström, M. Persson, E. Bostedt, A. Kristofferson and R. Carlsson, in “Ceramic Transactions”, Vol. 2, Silicon Carbide 87, edited by J. D. Cawley and C. E. Semler (American Ceramic Soc., Westerville, 1989) p. 175.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kevorkijan, V.M., Komac, M. & Kolar, D. Low-temperature synthesis of sinterable SiC powders by carbothermic reduction of colloidal SiO2 . J Mater Sci 27, 2705–2712 (1992). https://doi.org/10.1007/BF00540693
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00540693