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Bandung, Indonesia

Septawendar R.,Laboratory of Nano Materials | Setiati A.,Center for Ceramics | Sutardi S.,Laboratory of Nano Materials
Ceramics International | Year: 2011

Alumina-zirconia nanocomposite powder was synthesized at a room temperature and calcined at a lower temperature than 1000 °C of about 800 °C by sugar precursor process. In the synthesis process of the nanocomposite powder, sugar was used as a gelling agent. The synthesized powder was calcined at temperatures of 800 °C, 900 °C, 1000 °C, 1100 °C, and 1200 °C for 5 h. The calcined powder was characterized by X-ray diffraction (XRD), a SYMPATEC NIMBUS particle size analysis, and transmission electron microscopy (TEM). Alumina-zirconia nanocomposites were obtained at 800 °C, where the phases formed were γ-Al 2O 3, m-ZrO 2, and t-ZrO 2. The TEM results showed that the average grain sizes of the nanocomposite were less than 25 nm in diameter. At 800 °C, a particle size analyzer measured the largest nanocomposite particles as having a size of about 40 nm, accounting for 3.49% of the total, while the most commonly sized partical was about 10 nm for 39.87%. A further phase transformation of alumina-zirconia nanocomposites was obtained at 1100 °C, where the phases formed were α-Al 2O 3, m-ZrO 2, and t-ZrO 2; the TEM results show that the average grain sizes of the nanocomposite powder were below 50 nm in diameter. © 2011 Elsevier Ltd and Techna Group S.r.l. Source

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