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Journal of Materials Science

, Volume 29, Issue 15, pp 4119–4124 | Cite as

The formation of NaMg2Al15O25 in an α-Al2O3 matrix and its effect on the mechanical properties of alumina

  • Hai-Doo Kim
  • Im-Sik Lee
  • Suk-Won Kang
  • Jae-Woong Ko
Papers

Abstract

An in-situ sintering reaction was designed to produce lath-like \‴-alumina in an α-alumina matrix in order to make alumina ceramics stronger and tougher. The reaction sequence to produce \‴-alumina (NaMg2Al15O25) requires the formation of \-alumina (NaAl11O17) and spinel (MgAl2O4) at around 1100 dgC followed by a solid-state reaction of these two phases to give \‴-alumina at elevated temperatures; this reaction is complete at around 1600 °C. The in-situ sintering reaction produces near-theoretically dense alumina ceramics in which lath-like \‴-aluminas are homogeneously distributed. The bending strength and fracture toughness increase to 620 MPa and 5 MPam1/2, respectively; these increases are thought to be due to the suppression of grain growth as well as the crack deflection and bridging associated with lath-like \‴-alumina.

Keywords

Polymer Alumina Mechanical Property Elevated Temperature Fracture Toughness 
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 1994

Authors and Affiliations

  • Hai-Doo Kim
    • 1
  • Im-Sik Lee
    • 1
  • Suk-Won Kang
    • 1
  • Jae-Woong Ko
    • 1
  1. 1.Ceramic Materials LaboratoryKorea Institute of Machinery and MetalsKyungnamKorea

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