Abstract
A method of analyzing initial sintering data which is insensitive to uncertainties in the time zero and initial compact length is reviewed. This method permits a considerably more reliable determination of the mechanisms of material transport in the sintering process than the usual log shrinkage-log time plots. One may with confidence distinguish among volume diffusion, grain boundary diffusion, or both acting concurrently. Contributions of surface diffusion and evaporation-condensation to total mass transport are discernible. This technique was applied to isothermal shrinkage data of compacts of alumina prepared from several different powders. It was found that compacts which deviated from the ideal compact (uniformly sized spheres heated instantaneously to the sintering temperature) followed the shrinkage models after some small amount of abnormally rapid shrinkage, resulting in an effective initial length and time zero which were different from the experimental values. While these differences were small, they had a large effect on the log shrinkage-log time plot. Alumina apparently sinters by a grain boundary diffusion mechanism, with surface diffusion important at lower temperatures.
The research on which this chapter is based was supported by the Advanced Research Project Agency of the Department of Defence, through the Northwestern University Materials Research Center.
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Johnson, D.L. (1969). Powder Compact Studies of Initial Sintering. In: Gray, T.J., Fréchette, V.D. (eds) Kinetics of Reactions in Ionic Systems. Materials Science Research. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-6461-8_18
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DOI: https://doi.org/10.1007/978-1-4899-6461-8_18
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