| 반응소결법에 의한 AlN/SiC 휘스커 복합체의 제조 |
| 박정현, 김용남, 유재영, 강민수 |
| 연세대학교 세라믹공학과 |
| Preparation of AlN/SiC Whisker Composite by Reaction Sintering Process |
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| ABSTRACT |
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Al powder, AlN powder, SiC whisker and sintering aids were wet-mixed, and then the specimens prepared with mixed powder were reacted by nitridation at 600∼1400$^{circ}C$ for 5 hrs. It was cleat that the higher nitridation and the more SiC whisker content were, the better bending strength was. The specimen of Al50/AlN50 reacted at 1400$^{circ}C$ for 5hrs had the nitridation percent of 97%, the shrinkage under 2%, and the relative density of 78%. And the maximum bending strength of reaction-bonded specimen was 250 MPa. The specimens completely nitrided were post-sintered at 1700, 1800 and 1900$^{circ}C$ for 2hrs. The post-sintered body had the shrinkage under 6% and the relative density of 86%. Because of the formation of solid solution between AlN and SiC whisker over 1800$^{circ}C$, the promotion of mechanical properties according to SiC whisker addition was not observed. The post-sintered body had the maximum bending strength of 195 MPa. |
| Key words:
Al, AlN, SiC whisker, Nitridation, Reaction sintering, Post-sintering |
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