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Journal of the Korean Ceramic Society 1996;33(10): 1147. |
| 알콕사이드로부터 $Al_2O_3-TiO_3$계 복합분체의 합성(2) 2. Sol-Gel 법으로 제조한 Al2TiO5 와 $Al_2TiO_5$/mullite(alumina) 복합체의 열적-기계적 특성 |
| 이홍림, 정종렬, 이형민 |
| 연세대학교 세라믹공학과 |
| Preparation of $Al_2O_3-TiO_2$ Composite Powder from Alkoxides (2) 2. Thermo-mechanical Properties of $Al_2TiO_5$ /mullite (alumina) Composites Prepared by the Sol-Gel Method |
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| ABSTRACT |
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Al2TiO5 powder prepared by the sol-gel processing from the metal alkoxides ; aluminium sec-butoxide (Al(OC4H9)3 and tetraethyl orthotitanate (Ti(OC2H5)4) was very fine and had a narrower particle size distribution than that prepared from the commercial alumina and titania powders. The addition of mullite and Al2O3 powder to Al2TiO5 inhibited the grain growth and this resulted in decrease of microcracks and increase of fracture strength. Al2TiO5/ mullite composite showed the higher fracture strength than Al2TiO5/alumina composite. The thermal expansion of Al2TiO5 increased with the addition of mullite and alumina and also increased with tempe-rature up to 100$0^{circ}C$ however it decreased in the temperature range between 100$0^{circ}C$ and 125$0^{circ}C$ during during heating The decomposition test showed that the addition of mullite suppressed the decomposition of Al2TiO5 on the contrary the addiion of Al2O3 accelerated the decomposition of Al2TiO5 |
| Key words:
Aluminum titanate, Metal alkoxide, Microcrack, Fracture strength, Thermal expansion, Decomposition |
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