Abstract
It is demonstrated that dense alpha alumina can be fabricated by pressing ethanol-dispersed, α-Al2O3 seeded boehmite. Green bodies were formed by uniaxially pressing either water or ethanol dispersed gel powder and then isostatically pressing the compacts at 280 MPa. Green microstructure and alumina densification are correlated with gel agglomerate size and dispersing medium. The ethanol-dispersed specimens showed better sinterability than the water-dispersed specimens, and sintered to more than 99% theoretical density at 1300°C. It is shown that softer gel agglomerates were obtained by alcohol dispersion and resulted in better green microstructure and higher sintered density.
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References
D.I. Matkin, W. Munro, and T.M. Valentine, J. Mater. Sci.6, 974 (1971).
P.A. Badkar, J.E. Bailey, and H.A. Baker, inSintering and Related Phenomena, edited by G.C. Kuczynski, Mater. Sci. Res. (Plenum, New York, 1973), vol. 6, p. 311.
P.F. Becher, J.H. Sommers, B.A. Bender, and B.A. MacFarlane, inProcessing of Crystalline Ceramics, edited by H. Palmour IV, R.F. Davis, and T. Hare, Mater. Sci. Res. (Plenum, New York, 1978), vol. 11, p. 79.
B.E. Yoldas, J. Am. Ceram. Soc.65, 387 (1982).
M. Kumagai and G.L. Messing, J. Am. Ceram. Soc.68, 500 (1985).
Y. Suwa and R. Roy, Mater. Sci. & Eng.83, 151 (1986).
E. Prouzet, D. Fargeot, and J.F. Baumard, J. Mater. Sci. Letter9, 779 (1990).
J.L. McArdle and G.L. Messing, Adv. Ceram. Mater.3, 387 (1988).
J.L. McArdle and G.L. Messing, J. Am. Ceram. Soc.67, c-230 (1984).
M. Kumagai and G.L. Messing, J. Am. Ceram. Soc.68, 500 (1985).
G.L. Messing and M. Kumagai, Am. Ceram. Soc. Bull.73, 88 (1994).
G.W. Scherer, inBetter Ceramics Through Chemistry II, edited by C.J. Brinker, D.E. Clark, and D.R. Ulrich (Materials Research Society, Pittsburgh, PA, 1986), p. 225.
A.F.M. Leenaars, L. Keizer, and A.J. Burggraaf, J. Mater. Sci.19, 1077 (1984).
A.C. Pierre and D.R. Uhlmann, inBetter Ceramics Through Chemistry II, edited by C.J. Brinker, D.E. Clark, and D.R. Ulrich (Materials Research Society, Pittsburgh, PA, 1986), p. 481.
J.J. Lannutti and D.E. Clark, Ceramics International.11, 91 (1985).
D.S. Horn and G.L. Messing, J. Am. Ceram. Soc.72, 1719 (1989).
T.V. Mani, P.K. Pillai, A.D. Damodaran, and K.G.K. Warrier, Materials Letters19, 237 (1994).
A. Roosen and H. Hausner, Adv. Ceram. Mater.3, 131 (1988).
H.K. Varma, T.V. Mani, A.D. Damodaran, K.G. Warrier, and U. Balachandran, J. Am. Ceram. Soc.77, 1597 (1994).
M.F.L. Johnson and J. Mooi, Journal of Catalysis10, 342 (1968).
M.J. Readey, R.R. Lee, J.W. Halloran, and A.H. Heuer, J. Am. Ceram. Soc.73, 1499 (1990).
A. Roosen and H.K. Bowen, J. Am. Ceram. Soc.71, 970 (1988).
J.W. Halloran, inUltrastructure Processing of Ceramics, Glass, and Composites, edited by L.L. Hench and D.R. Ulrich (Wiley, New York, 1984), p. 404.
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Kwon, S., Messing, G.L. Dry pressing boehmite gels for the fabrication of monolithic α-Al2O3 . J Sol-Gel Sci Technol 9, 53–64 (1997). https://doi.org/10.1007/BF02439336
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DOI: https://doi.org/10.1007/BF02439336