Abstract
Spherical, submicrometre, amorphous hydrous titania powder synthesized by controlled hydrolysis and polymerization from titanium tetraethoxide solutions was hydrothermally converted to spherical polycrystalline anatase particles by autoclaving or refluxing. Green compacts produced with either autoclaved or refluxed powder via a colloid filtration route had a high density and were crack-free; processing with untreated hydrous titania resulted in cracked green compacts. Compacts of the hydrothermally treated powders could be sintered to 98% theoretical density at temperatures as low as 900° C. A compact of commercial powder produced in the same fashion was not observed to densify at such temperatures. Using various firing techniques, compacts of the hydrothermally treated powder could be sintered to 98% theoretical density or greater while controlling the titania phase assemblage as (1) anatase, (2) rutile, or (3) a mixture of anatase and rutile. By scaling the phase transformation and sintering kinetics, the grain size of the sintered microstructure can be controlled from a submicrometre to a micrometre scale.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
H. K. Bowen, J. Mater. Sci. Engng 44 (1980) 1.
E. A. Barringer and H. K. Bowen, Langmuir 1 (1985) 414.
Idem, J. Amer. Ceram. Soc. 65 (1982) C199.
E. A. Barringer, R. Brook and H. K. Bowen, in “Sintering and Heterogeneous Catalysis”, edited by G. C. Kuczynski, A. E. Miller, and G. A. Sargent (Plenum, New York, 1984) pp. 1–21.
Y. Iida and S. Ozaki, J. Amer. Ceram. Soc. 44 (1961) 120.
L. Erdey, “Gravimetric Analysis” (Pergamon, New York, 1965) pp. 459–73.
M. F. Van and W. W. Rhodes, Mater. Sci. Engng. 61 (1983) 59.
A. Matthews, Amer. Mineral. 61 (1976) 419.
A. W. Czanderna, C. N. R. Rao and J. M. Honing, Trans. Faraday Soc. 54 (1958) 1069.
S. Hisita, I. Mutoh, K. Koumoto and H. Yanagida, Ceram. In. 9 (2) (1983) 61.
R. D. Shannon and J. A. Pask, Amer. Mineral. 49 (1964) 1707.
B. Novich, “Continuous Processing of Ceramic Oxide Powders,” Report no. Q1, Ceramics Processing Research Laboratory, MIT, Cambridge, Massachusetts 02139 (1984).
P. Nahass and H. K. Bowen, Mater. Sci. Engng. (1988) to be published.
L. J. Bellamy, “The Infra-red Spectra of Complex Molecules” (Wiley, New York, 1975).
K. Nakamoto, “Infrared and Raman Spectra of Inorganic and Coordination Compounds” (Wiley, New York, 1978).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Oguri, Y., Riman, R.E. & Bowen, H.K. Processing of anatase prepared from hydrothermally treated alkoxy-derived hydrous titania. J Mater Sci 23, 2897–2904 (1988). https://doi.org/10.1007/BF00547465
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00547465