Nano Archive

Microstructures of porous Al2O3-50 wt.% ZrO2 composites using in-situ synthesized Al2O3-ZrO2 composite powders

Han, Jae-Kil and Saito, Fumio and Lee, Byong-Taek (2004) Microstructures of porous Al2O3-50 wt.% ZrO2 composites using in-situ synthesized Al2O3-ZrO2 composite powders. Materials Letters, 58 (16). 2181 - 2185.

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Official URL: http://www.sciencedirect.com/science/article/B6TX9...

Abstract

Al2O3–50 wt.% ZrO2 composite powder was synthesized using the sol–gel process with aluminum iso-propoxide and zirconium butoxide as precursors. The as-received composite powders were in an amorphous phase. By calcinating them at 900 °C, the cubic (c)-ZrO2 phase, which was 5 nm average in diameter, was crystallized. As the calcination temperature increased up to 1100 °C, a small amount of tetragonal (t)-ZrO2 phase was detected, although the main phase was c-ZrO2. However, the Al2O3 particles in the Al2O3–50 wt.% ZrO2 mixed powders existed in an amorphous phase up to 1100 °C. The porous Al2O3–ZrO2 composite having ranged from 400 to 1000 nm in pore size was successfully obtained using the Al2O3–50 wt.% ZrO2 composite powders. The distribution of pores was homogeneous and it was closely related to the calcination temperature. The major phases of the porous composites were an m-ZrO2 and α-Al2O3 although a t-ZrO2 phase also was detected as a minor phase. The pore frames of the Al2O3–50 wt.% ZrO2 composite were less than 400 nm thick and they were nanocrystalline with dense structure.

Item Type:Article
Uncontrolled Keywords:Porous ceramic; Al2O3–ZrO2; Nano powder
Subjects:Material Science > Nanostructured materials
ID Code:6883
Deposited By:SPI
Deposited On:24 Sep 2009 17:05
Last Modified:24 Sep 2009 17:05

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