Abstract
The dispersion characteristics of commercial Si3N4 powder in aqueous media (deionized water) was studied as a function of pH in the range 2–11. The slip was characterized for its dispersion quality by various experimental techniques like particle size analysis, sedimentation phenomena, viscosity and flow behaviour and zeta potential analysis. The optimum dispersion was found to be in the pH region 9–11 wherein the slurry displayed minimum sedimentation height, minimum viscosity, near Newtonian flow behaviour and maximum zeta potential. The slip is highly agglomerated in the pH range 2–8 as manifested by higher sedimentation height, higher viscosity, lower zeta potential and thixotropic non-Newtonian flow behaviour. The 72 wt% (44 vol.%) Si3N4 slips made at pH = 10 resulted in green bodies having 53–59% of theoretical density after casting into plaster molds.
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References
Alford N McN, Birchall J D and Kendall K 1986Mater. Sci. & Technol. 2 329
Bergstrom L and Pugh R J 1989J. Am. Ceram. Soc. 72 103
Bergstrom L and Bostedt E 1990Colloids & Surfaces 49 183
Brook R J 1985Mater. Sci & Eng. 71 305
Dutta S 1988Adv. Ceram. Mater. 3 257
Freedman M R and Millard M L 1986Ceram. Eng. & Sci. Proc. 7 884
Fries R and Rand B 1996Materials science and technology, A comprehensive treatment, inProcessing of ceramics, Part I (eds) R W Cahn, P Hassen and E J Kramer, (Vol. ed.) R J Brook (Germany: VCH publishers Inc.) Vol. 17A, Ch. 6
Galassi C, Rastelli E, Roncari E, Ardizzone S and Cattania M G 1995J. Mater. Res. 10 339
Galassi C, Bertoni F, Ardizzone S and Bianchi C L 2000J. Mater. Res. 15 155
Hirata Y 1997Ceram. Int. 23 93
Hirata Y, Nakagama S and Ishihara Y 1990J. Mater. Res. 5 640
Hoffmann M J, Nagel A, Greil P and Petzow G 1989J. Am. Ceram. Soc. 72 765
Kendall K 1992Ceramic technology international (ed.) I Birkby (London: Sterling Pub.) p. 47
Lange F F 1983J. Am. Ceram. Soc. 66 396
Lange F F 1989J. Am. Ceram. Soc. 72 3
Li Y L, Liang Y, Zheng F, Xiao K, Hu Z Q and Shun T 1995J. Mater. Sci. Letts 14 713
Moreno R, Salomoni A and Castanho S M 1998J. Eur. Ceram. Soc. 18 405
Nagel A and Petzow G 1989J. Eur. Ceram. Soc. 5 371
Persson M, Forsgren A, Carlstrom E, Kall L, Kronberg B, Pompe R and Carlsson R 1987High tech ceramics (ed.) P Vincenzini (Amsterdam: Elsevier Science) p. 623
Peter Greil 1989Mater. Sci. & Eng. A109 27
Ramachandra Rao R and Kannan T S 2000J. Am. Ceram. Soc. (accepted)
Ramachandra Rao R, Roopa H N and Kannan T S 1999aCeram. Int. 25 223
Ramachandra Rao R, Roopa H N and Kannan T S 1999bJ. Eur. Ceram. Soc. 19 2145
Ramachandra Rao R, Roopa H N and Kannan T S 1999cJ. Eur. Ceram. Soc. 19 2763
Roosen A and Bowen H K 1988J. Am. Ceram. Soc. 17 970
Sato Y, Ueki M and Shintani K 1995J. Mater. Sci. 30 1373
Sheppard L M 1989Am. Ceram. Soc. Bull. 68 1815
Somiya S 1984Advanced technical ceramics (Tokyo: Academic Press) Ch. 2
Stadelmann H and Petzow G 1989J. Eur. Ceram. Soc. 5 155
Torre J P and Bigay Y 1986Ceram. Eng. Sci. Proc. 7 893
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Rao, R.R., Roopa, H.N. & Kannan, T.S. pH controlled dispersion and slip casting of Si3N4 in aqueous media. Bull Mater Sci 24, 57–61 (2001). https://doi.org/10.1007/BF02704841
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DOI: https://doi.org/10.1007/BF02704841