Densification of Ca-doped alumina nanopowders prepared by a new sol-gel route with seeding

  • Odaka A
  • Yamaguchi T
  • Fujita T
 et al. 
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Abstract

This paper demonstrates that the Ca-doped alumina nanopowders prepared by a new sol-gel route using polyhydoxoaluminum (PHA) and CaCl2solutions under α-alumina seeding represent a viable option for producing fine-grained ceramics. Appropriate conditions for producing Ca-doped alumina nanopowders suitable for low-temperature finer grained densification were 0.10 mol% Ca-doping, 5 mass% α-alumina seeding and a calcination temperature of 900 °C. These conditions led to the formation of new nano-sized alumina powders, which consisted of ∼80 nm α-alumina particles and γ-alumina nanoparticles. Using these Ca-doped nanopowders, fully densified alumina ceramics with a uniform microstructure composed of fine grains with an average grain size of 0.66 μm could be obtained at 1375 °C. Clearly, the Ca-doped nanopowders obtained here through the proposed sol-gel route are very suitable for fabricating dense, fine-grained alumina ceramics because an undoped sample with 5 mass% seeds led to a microstructure with an average grain size of 1.39 μm at 1375 °C. © 2008 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Al2O3
  • Ca-doping
  • Grain size
  • Sintering
  • Sol-gel process

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Authors

  • Atsushi Odaka

  • Tomohiro Yamaguchi

  • Takayuki Fujita

  • Seiichi Taruta

  • Kunio Kitajima

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