Sintering of Crystalline Oxides
The general theory of sintering accounts fairly well for various aspects of sintering of metallic particles. The experiments on sintering of spheres of various oxides revealed that although the predominant mechanism of the process seems to be that of volume diffusion, the actual sintering rates are often much faster than those which could be expected from the measured diffusion coefficients. This augmentation of diffusivity may be quite large. For instance, in sintering of A12O3 spheres, the rates observed were consistently 102 to 104 times higher than those calculated from the known oxygen diffusivity which, being slower than that of aluminum, should control the sintering rate. In Fe2O3, the effect was even larger.
KeywordsDiffusion Coefficient Apparent Diffusion Coefficient Anion Vacancy Crystalline Oxide Neck Growth
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- 1.Coble, R. L., and J. E. Burke, in: J. E. Burke (ed.), Progress in Ceramic Science, Vol. 3, Pergamon (New York), 1963, p. 199.Google Scholar
- 3.Kuczynski, G. C., L. Abernathy, and J. Allan, Kinetics of High Temperature Processes, Technical Press and J. Wiley (New York), 1959, p. 163.Google Scholar
- 5.Kuczynski, G. C., and A. Rozner, to be published.Google Scholar
- 6.Kuczynski, G. C., Plansee Proc, 4th Seminar, Reutle/Tyrol, 1961, p. 166.Google Scholar
- 9.Hutchings, J., and J. P. Roberts, Trabajos Tercera Reunion International Ractividad de los Solidos (Madrid), 1957, p. 389.Google Scholar
- 10.Kuczynski, G. G, L. Abernathy, and J. Allan, Plansee Proc, 3rd Seminar, Reutle/Tyrol, 1959, p. 1.Google Scholar
- 11.Kuczynski, G. C., “La Theorie du Frittage,” Centre d’Etudes Nucleares de Saclay, 1961.Google Scholar
- 12.Kuczynski, G. C., and D. Readey, J. Am. Ceram. Soc, to be published.Google Scholar
- 15.Lindner, R., Arkiv. Kemi 4: 381 (1952).Google Scholar
- 19.Wagner, C., Atom Movements, ASM (Cleveland), 1951, p. 153.Google Scholar
- 23.Kuczynski, G. G. and M. O’Keeffe, to be published.Google Scholar