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Journal of the Korean Ceramic Society 1998;35(4): 311. |
| 반응결합 강화 알루미나세라믹스의 제조에 관한 연구 |
| 김일수, 강민수1, 박정현1 |
동의대학교 재료공학과
1연세대학교 세라믹공학과 |
| A Study on the Fabrication of Reinforced Reaction Bonded Alumina Ceramics |
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| ABSTRACT |
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The reaction bonded alumina ceramics with reinforced particles which have low shrinkage were pro-duced by blending of SiC or TiC or ZrO2 powders to the mixture of Al metal and Al2O3 powder. The powd-ers were attrition milled isostantically pressed and preheated tio 110$0^{circ}C$ with a heating rate of $1.5^{circ}C$/min The specimens were then sintered at the temperature range 1500 to 1$600^{circ}C$ for 5 hours with a heating rate of 5$^{circ}C$/min. The specimens showed 5-9% weight gain and 2-9% dimensional expansion through the complete oxidation of Al after preheating up to 11--$^{circ}C$ the overall dimensional change of the specimens after the reaction sintering at 1500-1$600^{circ}C$ was 6-12% The maximum densities were 92% theoretical. The fine grain-ed(average grain size :0.4 ${mu}{textrm}{m}$) microstructure were observed in the specimen with ZrO2 and SiC. But the microstructure of specimen with TiC was relatively coarse.(average grain size : 2.1 ${mu}{textrm}{m}$) The mullite phase was formed by the reaction of Al2O3 and SiO2 in a specimen with SiC. In the TiC contained specimen TiC was oxidized into TiO2 and finally reacted with Al2O3 to form Al2TiO5 during sintering. |
| Key words:
Near net shape, RBAO, Al$_2$O$_3$ -SiC, Al$_2$O$_3$ -TiC, Al$_2$O$_3$ -ZrO$_2$ |
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