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γ-Al2O3 막의 미세구조 조절을 위한 γ-AlO(OH) 졸 제조시 숙성의 영향
Effect of Aging among γ-AlO(OH) Sol Preparation Steps Variables to Control Microstructure of γ-Al2O3 Particles
HWAHAK KONGHAK, December 1997, 35(6), 832-837(6), NONE
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Abstract
본 연구는 γ-Al2O3 막의 미세구조 특성을 조절하기 위한 연구 목적의 일환으로 졸 제조 공정 변수의 영향을 고찰하였다. 알루미늄 이소프로폭사이드를 출발물질로 사용하여 가수분해/축중합반응, 숙성, 해교과정을 거쳐서 γ-AlO(OH) 졸을 제조하였고, 600℃의 열처리를 거쳐 고온에서 안정한 γ-Al2O3 입자를 제조하였다. 본 연구결과, 숙성이 γ-AlO(OH) 입자 특성은 물론 γ-Al2O3 입자 특성에 이르기까지 큰 영향을 미침을 알았다. 숙성에 따라 γ-AlO(OH) 및 γ-Al2O3 입자의 결정도의 증가, 비표면적 감소 및 평균 기공경 증가를 나타냈으며, 제조된 γ-AlO(OH) 입자의 입도분포를 조절할 수 있었다. 숙성에 의해 조절된 γ-AlO(OH) 졸 입자의 특성은 소결처리후의 γ-Al2O3 입자 특성에 직결되는 결과를 가져왔으므로 γ-Al2O3 막의 미세구조 특성을 제어하기 위해서는 γ-AlO(OH) 졸 제조공정 가운데 숙성의 영향이 중요하다는 사실을 밝혔다.
In this study, we investigated the effects of sol preparation process variables in order to control microstructure characterization of γ-Al2O3 particles. Using aluminum isopropoxide as a starting material, we prepared γ-AlO(OH) sol solution through the process of hydrolysis/polycondensation, aging, peptization and then manufactured stable γ-Al2O3 particles at high temperature through thermal treatment at 600℃. As a result of this study, we knew that aging among the sol preparation step had an influence upon characterization of γ-Al2O3 particles as well as γ-AlO(OH) particles. According to aging, we could control the crystallinity and microstructure of γ-AlO(OH) and γ-Al2O3 particles. And we could also control the size distribution of average γ-AlO(OH) sol particles. The microstructure of γ-AlO(OH) particles controlled by aging had an influence the microstructure of γ-Al2O3 particles. Hence, we knew that the aging was the most important step to control microstructure of γ-Al2O3 membrane.
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References
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