Glass-alumina Composites Prepared by Melt-infiltration: Ⅰ. Effect of Alumina Particle Size

용융침투법으로 제조한 유리-알루미나 복합체: Ⅰ. 알루미나 입도 효과

  • Lee, Deuk-Yong (Department of Materials Engineering, Daelim College of Technology) ;
  • Jang, Ju-Woong (Dental Material Research Center, We DongMyung Co., Ltd.) ;
  • Kim, Dae-Joon (Multifunctional Ceramics Research Center, Korea Institute of Science and Technology) ;
  • Park, Il-Seok (Multifunctional Ceramics Research Center, Korea Institute of Science and Technology, Department of Ceramic Engineering, Yonsei University) ;
  • Lee, Jun-Kwang (Multifunctional Ceramics Research Center, Korea Institute of Science and Technology) ;
  • Lee, Myung-Hyun (Next Generation Enterprise Group, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Bae-Yeon (Department of Materials Engineering, Univerisity of Incheon)
  • 이득용 (대림대학 재료정보공학과) ;
  • 장주웅 ((주)우리동명 치과재료연구소) ;
  • 김대준 (KIST 복합기능세라믹센터) ;
  • 박일석 (KIST 복합기능세라믹센터,연세대학교 세라믹공학과) ;
  • 이준강 (KIST 복합기능세라믹센터) ;
  • 이명현 (KICET 차세대사업단) ;
  • 김배연 (인천대학교 재료공학과)
  • Published : 2001.01.01

Abstract

Two commercial alumina powders having different particle size of $0.5{\mu}m$ and 3${\mu}$m were presintered at 1120$^{\circ}$C for 2h and then lanthanum aluminosilicate glass was infiltrated at 1100$^{\circ}$C for up to 4h to obtain the densified glass-alumina composites. The effect of alumina particle size on packing factor, microstructure, wetting, porosity and pore size, and mechanical properties of the composite was investigated. The optimum mechanical properties and compaction behavior were observed for the 3${\mu}$m alumina particle dispersed composite. The 3${\mu}$m alumina particle size and distribution for he preform were within 0.1 to 48${\mu}$m and bimodal and random orientation. The strength and the fracture toughness of the composite having 3${\mu}$m alumina particles were 519MPa and $4.5MPa{\cdot}m^{1/2}$, respectively.

상용 알루미나 분말(0.5${\mu}$m, 3${\mu}$m)을 die-press법을 이용하여 1120$^{\circ}$C에서 2시간 1차 소결하여 다공성 전성형체를 제조하고 1100$^{\circ}$C에서 4시간 $La_2O_3-Al_2O_3-SiO_2$계 유리를 용융 침투시켜 치밀한 유리-알루미나 복합체를 제조하였다. 알루미나 입도가 유리-알루미나 복합체의 충진율, 미세조직, 젖음성, 기공률 및 크기, 기계적 특성에 미치는 영향을 조사하였다. 입도 범위가 0.1∼48${\mu}$m로 넓고 bimodal size 입도 분포를 가지면서 random orientation을 가진 3${\mu}$m 알루미나가 분산된 복합체가 최적의 기계적 특성 및 충진률이 관찰되었으며 강도와 인성값은 각각 519MPa, $4.5MPa{\cdot}m^{1/2}$이었다.

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