Superfast densification of ceramic composites in the pseudobinary system Al 2 O 3 ‐Y 3 Al 5 O 12 was carried out by using a new technique called spark plasma sintering (SPS). Dense ceramic composites were obtained by heating appropriate powder mixtures to 1573 K in an SPS unit at a rate of 600 K/min. No holding time at 1573 K was applied. Scanning electron microscopy studies showed the compacted materials to contain submicrometer‐sized grains of the same sizes as the precursor powder mixtures; i.e., no significant grain growth had occurred.
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Gao et al. (1999) studied this question.
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