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논문 상세정보

$Al_2O_3$의 상전이 및 그에 따른 미세구조 제어에 관한 연구

A Study on Phase Transformation and Microstructure Control of $Al_2O_3$

Abstract

A fine $\alpha$-Al2O3 powder was prepared by sol-gel process for membrane application. And it was carried out by adding 1.5wt% $\alpha$-Al2O3 powders(mean size : 87 nm) as seeds to the prepared sols and by controlling the heating schedule (the heating rate and the soaking time) to prevent the microstructural change, which occured during $\theta$-to $\alpha$Al2O3 phase transformation. The seeded $\alpha$-Al2O3 particles acted as the heterogeneous nucleation sites for the $\alpha$-Al2O3 nucleation during the transformation of $\theta$- to $\alpha$-Al2O3 and resulted in increasing the driving force of phase transformation to activate the formation of $\alpha$-Al2O3 phase at 82$0^{\circ}C$. By $\alpha$-Al2O3 seeding and controlling of heating condition the phase transformation of $\theta$- to $\alpha$-Al2O3 was accomplished at low temperature and the grain growth process was depressed. Therefore, the unsupported membrane could be fabricated in $\alpha$-Al2O3 . The average diameter of pores in the fabricated membrane was 7 nm and the porosity was 47%.

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참고문헌 (18)

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이 논문을 인용한 문헌 (1)

  1. 1999. "Effect of CuO on Dielectric and Piezoelectric properties of $Pb(Ni,Nb)O_3-Pb(Zr, Ti)O_3$ Prepared from Two Types of Columbite Precursors" 요업학회지 = Journal of the Korean Ceramic Society, 36(11): 1235~1242 

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