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J. Korean Ceram. Soc. > Volume 35(4); 1998 > Article
Journal of the Korean Ceramic Society 1998;35(4): 406.
RBAO 세라믹스 공정에서 어트리터 효율에 미치는 볼 크기의 영향
김일수, 강민수1, 박정현1
동의대학교 재료공학과
1연세대학교 세라믹공학과
The Effects of Ball Size on Attritor Efficiency in the Processing of RBAO Ceramics
The reaction bonded alumina ceramics was prepared through the addition of each SiC and ZrO2 powder to the mixture of Al metal powder and Al2O3 The mono sized (3mm) and biodal sized (3mm+5mm) balls were used in attrition milling of Al and starting powders. The milling efficiency of both cases was compared by the analysis of particle size and X-ray diffraction. After the forming and sintering of each powder batchs the weight gains dimensional changes and densities were determined. The specimens were investigated by X-ray diffraction analysis and scanning electron microscope. Bimodal sized balls had better milling effect than single ball size in the milling of Al powder. However in the milling which ceramic powders mono sized the green body during the reaction sintering at 1$600^{circ}C$ for 5 hour was about 10% The densities attained the values of 92-98% theoretical. The SiC added specimen that was milled with 3mm ball media had 96% theoretical density and dense microstructure.
Key words: RBAO, Attrition mill, Near net shape, ZrO$_2$ ball size
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