Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Formation of La-$\beta$-Aluminate in $\alpha$-Alumina Matrix and Its Influence on Mechanical Properties

La-$\beta$-Aluminate의 형성이 $\alpha$-Alumina의 기계적 성질에 미치는 영향

  • 강석원 (한국기계연구소 요업재료실) ;
  • 고재웅 (한국기계연구소 요업재료실) ;
  • 김해두 (한국기계연구소 요업재료실)
  • Published : 1992.01.01
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Abstract

Alumina ceramics was reinforced by in-situ formation of La-${\beta}$-aluminate in ${\alpha}$-alumina matrix. The powder mixture of which composition is (100-12x)Al2O3+x(La2O3+11Al2O3) was prepared for the formation of La-${\beta}$-aluminate in ${\alpha}$-alumina matrix. The amount of La-${\beta}$-aluminate in the matrix was controlled by varing x which is number of moles. The dense composite was produced by sintering at 1600$^{\circ}C$ in air or hot-pressing at 1550$^{\circ}C$ under 30 MPa. Bending strength and fracture toughness were increased, resulting from the grain growth inhibition and the crack deflection and crack bridging mechanism when La-${\beta}$-aluminate was produced in ${\alpha}$-alumina matrix.

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References

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