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Journal of Materials Science

, Volume 30, Issue 5, pp 1196–1202 | Cite as

Some properties of mullite powders prepared by chemical vapour deposition

Part II Sinterability
  • Kiyoshi Itatani
  • Takayasu Kubozono
  • F. Scott Howell
  • Akira Kishioka
  • Makio Kinoshita
Papers

Abstract

The sinterability of mullite (3Al2O3·2SiO2) powder prepared by chemical vapour deposition was examined to improve the conditions for fabricating dense mullite ceramics. The starting powder contained not only mullite, but also a small amount of γ-Al2O3 (Al-Si spinel) and amorphous material. Although the compressed powder was fired at a temperature between 1550 and 1700 °C for 1, 3 and 5 h, the relative densities of the sintered compacts were limited to ∼ 90%: (i) due to the creation of pores/microcracks during the solid state reaction (1100–1350 °C), and (ii) due to restriction on the rearrangement of grains because the amount of liquid phase (1550–1700 °C) was insufficient. Calcination of the starting powder was effective for preparation of easily sinterable powder with homogeneous composition. When the compact formed by compressing the calcined powder at 1400 °C for 1 h was fired at 1650 °C for 3 h, the relative density was raised up to 97.2%; moreover, mullite was the only phase detected from the sintered compact. The sintered compact was composed of polyhedral grains with sizes of 1–2 μm and elongated grains with long axes of ∼ 6 μm.

Keywords

Polymer Liquid Phase Solid State Calcination Relative Density 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • Kiyoshi Itatani
    • 1
  • Takayasu Kubozono
    • 1
  • F. Scott Howell
    • 1
  • Akira Kishioka
    • 1
  • Makio Kinoshita
    • 1
  1. 1.Department of Chemistry, Faculty of Science and EngineeringSophia UniversityTokyoJapan

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