Fabrication of Nanocrystalline Superplastic ZrO2 Ceramics
An average particle size of d ≈ 300 nm can be reduced to a nanocrystalline size of about 10 nm or less after 400 h HEBM process. Amorphous-like phase is also observed among the nanocrystalline particles. Using SPS, the nanocrystalline powder can successfully be consolidated into a dense nanocrystalline ZrO2-spinel composite of d ≈ 90 nm. As compared with the data for submicro-grain composite with d = 350 nm, nano-crystalization increased the strain rate by one order of magnitude or lowered the deforming temperature by about 100 K.
K. Morita et al., "Fabrication of Nanocrystalline Superplastic ZrO2 Ceramics", Materials Science Forum, Vols. 551-552, pp. 491-496, 2007