Abstract
Fine nanoparticles (NPs) exhibit higher sintering activity than large ones and are usually desired for sintering of nanocrystalline (NC) ceramics with fine grains. This paper demonstrates that large α-Al2O3 polycrystalline (PC) NPs with a mean particle size of 62nm show a similar sintering activity as α-Al2O3 single-crystal (SC) NPs with a mean particle size of 16nm.α-Al2O3 NC ceramics sintered from the 62nm α-Al2O3 PC NPs and 16nm α-Al2O3 SC NPs by two-step sintering exhibit a similar mean grain size of about 75nm and a similar relative density of about 99.5%. It may be because the 62nm α-Al2O3 PC NPs and 16nm α-Al2O3 SC NPs have a similar mean grain size of about 19nm. These results imply that NC ceramics with fine grains may be sintered from large PC NPs with fine grain sizes.
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