A Study on the Preparation and Sinterability of MgO-Doped $Al_2O_3$ Powders by SprayPyrolysis Method

분무열분해법에 의한 MgO 첨가 $Al_2O_3$ 분체합성 및 소결성에 관한 연구

  • 박정현 (연세대학교 요업공학과) ;
  • 조경식 (연세대학교 요업공학과) ;
  • 송규호 (연세대학교 요업공학과)
  • Published : 1990.04.01

Abstract

Al2O3 and 0.25wt% MgO-doped Al2O3 powders were made from the alcohol solution of Al(NO3)3.9H2O and Mg(NO3)2.6H2O by spray pyrolysis method. Each powder was prepared at 900 and 100$0^{\circ}C$. Powders prepared at 90$0^{\circ}C$ were amorphous phase, but prepared at 100$0^{\circ}C$ wre mainly ${\gamma}$-Al2O3 crystalline form. Particle size of the MgO-doped Al2O3 powders was in the range of 0.2-2${\mu}{\textrm}{m}$, but undooped powders shwoed comparatively wider range of particle size. All the powders prepared at 900 and 100$0^{\circ}C$ were transformed to $\alpha$-Al2O3 crystalline form by calcination at 110$0^{\circ}C$ for 1hr. Each powder was sintered at 1600, 1650 and 1$700^{\circ}C$ for 2hrs. MgO-doped Al2O3 body sintering at 1$650^{\circ}C$ showed 99% of relative density but undooped Al2O3 showed 95% of relative density, even sintered at higher temperature of 1$700^{\circ}C$.

Keywords

References

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