화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Materials Research, Vol.13, No.4, 251-258, April, 2003
DOI10.3740/MRSK.2003.13.4.251  Export Citation
수용성 매체에서 뮬라이트의 합성거동 및 입자형상에 미치는 염 및 전구체 pH의 영향
Effects of Salt and Precursor pH on Synthesizing Behavior and Grain Morphology of Mullite in Aqueous System
정연길†, 이재언, 신영일, 김재원, 조창용1
  • 창원대학교 재료공학과
  • 1한국기계연구원 내열재료그룹
Yeon-Gil Jung†, Jae-Ean Lee, Young-Ill Shin, Jae-Won Kim, and Chang-Yong Jo1
  • Department of Ceramic Science and Engineering, Changwon National University, #9 Sarim-dong, Changwon, Kyungnam 641-773, Korea
  • 1High Temperature Materials Group, Korea Institute of Machinery and Materials, #66 Sangnam-dong, Changwon, 641-010, Korea
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The effects of the salt and the precursor pH on the synthesizing behavior and the morphology of mullite have been studied. Two kinds of mullite precursor sols were prepared by the dissolution of two kinds of salt (aluminum nitrate enneahydrate, Al( NO 3 ) 3 ㆍ 9H 2 O; type I and aluminum sulfate 14∼18 water, (SO Al 4 ) 3 ? 14∼18H 2 O; type II) into the mixture of colloidal silica sol, respectively. Precursor pH of the sols was controlled to the acidic (pH= 1.5∼2) and basic (pH= 8.5∼9) conditions. The co-products with nitrate and sulfate were completely eliminated at 500 ? C and 850 ? C , respectively, which was confirmed by TG/DTA results. The synthesizing temperature of mullite phase was found to be above 1200 ? C for pH= 1.5∼2 and above 1300 ? C for pH= 8.5∼9 in type I. However, in type II, the synthesizing temperature of mullite was decreased to 850 ? C for pH= 1.5∼2 and 1100 ? C for pH= 8.5∼9. The grain size of the mullite synthesized at pH= 8.5∼9 was larger than that at pH= 1.5∼2 in overall heat-treated temperatures, showing smaller grain size in type II. Aspect ratio of the mullite grains was more increased at pH= 1.5∼2 than pH= 8.5∼9 in type I, showing similar aspect ratio at both pH conditions in type II. It was found that the synthesizing temperature and grain size were predominantly governed by the initial precursor pH and decomposition of the salt, with minor effect on the grain morphology.
Keywords:Mullite;precursor ph;salt;synthesizing temperature;grain morphology;grain size
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