Preparation of Ca-α SiAlON hollow spheres by carbothermal reduction-nitridation of CaO-Al2O3-SiO2 glass

Mikinori Hotta, Junichi Hojo, Katsutoshi Komeya, Junichi Tatami, Takeshi Meguro, Hirohisa Masuda, Kenji Morinaga, Yi-Bing Cheng

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Ca-α SiAlON powders were prepared by carbothermal reduction-nitridation of CaO-Al2O3-SiO2 glasses at 1450 °C for 2 h in nitrogen. The content of Ca-α SiAlON phase was 65-81% in the products, and the other phases were AlN and β-SiAlON. The products contained hollow spheres with the size of around 5 μm in diameter. The particle morphology was almost identical to that of Ca-α SiAlON prepared from CaCO3-Al2O3-SiO2 powder mixtures.

Original languageEnglish
Pages (from-to)116-118
Number of pages3
JournalMaterials Letters
Issue number1
Publication statusPublished - 15 Jan 2011


  • Carbothermal reduction-nitridation
  • Glass
  • Microstructure
  • Powder technology
  • SiAlON

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