Characterization of agglomeration state in nanocrystalline 3YSZ powders through pressure–displacement curves and nanoindentation of green compacts

• Published in: Powder technology Vol. 228; pp. 272 - 276
• Main Authors: Patil, Sharanabasappa B., Bhargava, Parag
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.09.2012; Elsevier
• Subjects: Agglomeration; Applied sciences; Chemical engineering; Compacts; coprecipitation; Crystallites; Density; ethanol; Ethyl alcohol; Exact sciences and technology; Green compacts; Miscellaneous; Nanocrystals; Nanoindentation; Powders; resistance to penetration; Roasting; Sintering, pelletization, granulation; Solid-solid systems; temperature; Temperatures; transmission electron microscopes; transmission electron microscopy; washing; Yttria-stabilized zirconia; Temperatures; Powders; Agglomeration; Green compacts; Density; Yttria-stabilized zirconia; Transmission electron microscopy; Washing; Compaction; Powder; Calcining
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2012.05.030

Nanocrystalline 3YSZ (3mol% yttria stabilized zirconia) powders were synthesized through co-precipitation followed by washing with ethanol and calcination at different temperatures in the range of 470–900°C. The powders calcined at different temperatures showed apparent differences in the state of agglomeration. Besides the use of conventional techniques, such as Transmission Electron Microscope (TEM), for observation of crystallite size and agglomeration in powders, the differences in state of agglomeration of the powders were examined through pressure–displacement behavior during powder compaction, nanoindentation of green powder compacts. The observations from load–displacement behavior were shown to be correlated to resistance to penetration of green compacts during nanoindentation as well as the green and sintered densities. 3YSZ powders calcined at different temperatures showed apparent differences in the state of agglomeration on examination through pressure–displacement behavior during powder compaction. The observations from pressure–displacement behavior were shown to be correlated to resistance to penetration of green compacts during nanoindentation as well as the green and sintered densities. [Display omitted] ► 3YSZ nanopowders calcined at temperatures ≤700°C had higher degree of agglomeration ► Powders calcined at temperatures (800°C and 900°C) had lower degree of agglomeration ► Powders calcined at 800°C and 900°C showed highest sintered density of 93% of TD ► Powders calcined at 470°C showed lowest sintered density of 87% of TD