Effect of Tetragonal $ZrO_2$ Addition on the Mechanical Properties of $\alpha$-Alumina/La-\beta-Aluminate $Composite

정방정 $ZrO_2$의 첨가가 $\alpha$-Alumina/La-\beta-Aluminate $ 복합체의 기계적 성질에 미치는 영향

  • Suk-Won Kang (Ceramic Materials Lab., Korea Institute of Machinery & Metals) ;
  • Hai-Doo Kim (Ceramic Materials Lab., Korea Institute of Machinery & Metals) ;
  • Shin Kim (Ceramic Materials Lab., Korea Institute of Machinery & Metals) ;
  • Soo-Young Lee (Ceramic Materials Lab., Korea Institute of Machinery & Metals) ;
  • Dong-Soo Park (Ceramic Materials Lab., Korea Institute of Machinery & Metals)
  • 강석원 (한국기계연구원 재료기술연구부) ;
  • 김해두 (한국기계연구원 재료기술연구부) ;
  • 김신 (한국기계연구원 재료기술연구부) ;
  • 이수영 (한국기계연구원 재료기술연구부) ;
  • 박동수 (한국기계연구원 재료기술연구부)
  • Published : 1994.05.01


Alumina composite was fabricated by introducing tetragonal ZrO2 in alumina composite of $\alpha$-alumina reinforced with in-situ formed La-$\beta$-aluminate (LaAl11O18). The powder mixture of composition (100-x)[88 Al2O3+(La2O3+11 Al2O3)]+x vol% ZrO2 was prepared with x from 0 to 40. Dense composites fabricated by hot-pressing exhibited bending strength up to 1200 MPa. The gain growth inhibiting effect of ZrO2 grains and La-$\beta$-aluminate platelets, and possibly the stress-induced phase transformation of ZrO2 have resulted in the high bending strength. The fracture toughness of the composite also increased up to 8.5 MPa.m1/2. The enhancement in toughness can be explained by transformation and microcrack toughening of ZrO2 and by crack deflection and bridging of La-$\beta$-aluminate platelets and ZrO2.



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