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J. Korean Ceram. Soc. > Volume 36(1); 1999 > Article
Journal of the Korean Ceramic Society 1999;36(1): 43.
Si$_3$N$_4$ Whisker의 첨가량과 배열방향이 Si$_3$N$_4$ 복합 소결체의 기계적 특성에 미치는 영향
김창원, 박동수1, 박찬
부경대학교 재료공학과
1한국기계연구원 요업재료그룹
Effect of the Whisker Amount and Orientation on Mechanical Properties of the Si$_3$N$_4$ based Composites
Gas pressure sintered silicon nitride based composites with 0~5wt% $beta$-Si3N4 whiskers were prepared. The whiskers were unidirectionally oriented by a modified tape casting technqiue and green bodies with various microstructure were formed by changing stacking sequences of sheets cut from the tape. Orientations of the large elongated grains of the sample after gas pressure sintering were the same as the those of the whiskers of green body, and the sintering shrinkage and mechanical properties of sintered sample were consistent with the microstructural characteristics. In case of unidirectional samples, the sintering shrinkage normal to whisker alignment direction was larger than that parallel to the direction. The shrinkage difference inceaed as the whiskercontent increaed. As whisker content increaed, the crack length normal to and parallel to tape casting direction became shorter and larger, respectively. Although the grain size increased by th whisker addition, the flexural strength of unidirectional samples was not lower than that of smaple without the whisker. In case of crossplied and 45$^{circ}$rotated samples, the anisotropy of mechanical preoperties disappeared.
Key words: Tape casting, Whisker amount and orientation, Mechanical properties
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