Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Kinetic Study Of $La_2$O_3-A1_2O_3-SiO_2$ glass infiltration into Spinel Preforms

스피넬 전성형체의 $La_2$O_3-A1_2O_3-SiO_2$계 유리 침투 kinetic

  • 이득용 (대림대학 재료정보공학과) ;
  • 장주웅 ((주)우리동명 치과재료연구소) ;
  • 김병수 ((주)우리동명 치과재료연구소) ;
  • 김대준 (KIST 복합기능세라믹센터) ;
  • 송요승 (한국항공대학교 항공재료공학과)
  • Published : 2002.02.01
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Abstract

Abstract Spinel powder having a particle size of 0.9$\mu$m was calcined for 30 min at $1300^{\circ}C$, followed by ball milling for 4h, to obtain the spinel particle size of 3.29$\mu$m. The die-pressed spinel was presintered at $1100^{\circ}C$ for 2h and then lanthanum aluminosilicate glass was infiltrated at $1080^{\circ}C$ for 0~2 h to investigate the penetration kinetics in glass-spinel composite. The infiltration distance is parabolic in time due to capillarity. The strength and the fracture toughness of glassspinel composites were 317 MPa and 3.56 MPa $m^{1/2}$ respectively and dual microstructure of column (needle) and polygonal shapes as a result of recrystallization was observed due to the high calcination temperature.

상용 스피넬 분말(0.94$\mu$m)을 $1300^{\circ}C$ 2시간 열처리한 후 30분 동안 습식혼합하여 3.29$\mu$m의 최종분말을 제조하여 die-press법을 이용하여 $1100^{\circ}C$에서 2시간 1차 소결하여 다공성 전성형체를 제조하고 $1080^{\circ}C$에서 0~2시간가지 $La_2O_3-A1_2O_3-SiO_2$계 유리를 용응 침투시켜 유리 침투 깊이와 시간간의 kinetic을 조사하였다 유리 침투시간이 증가할수록 침투깊이는 모세관압에 의하여 parabolic하게 증가하였다. 유리-스피넬 복합체의 강도와 인성값은 각각 317MPa, 3.56MPa . $m^{1/2}$이 었으며 $1300^{\circ}C$의 높은 하소온도로 인한 재결정에 의하여 스피넬은 침상과 다각형 조직이 동시에 존재하는 이중 미세조직 이 관찰되었다.

Keywords

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