| 액상소결한 탄화규소의 집합조직 발달에 관한 연구 |
| 성한규, 조경식, 박노진, 최헌진1, 이준근1 |
금오공과대학교 재료공학과
1한국과학기술연구원 복합기능 세라믹스연구센터 |
| A Study on Texture Development in Liquid-Phase Sintered Silicon Carbide |
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| ABSTRACT |
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Development of texture in SiC materials by hot-pressing and subsequent annealing was studied. Crystallographic texture type was characterized by measuring X-ray pole figures on the perpendicular plane to the hot-pressing direction. Observed all pole figures were nearly axially symmetric (fiber texture). In case of ${beta}$-SiC materials, the pole density of basal plane (0004) increased as annealing time increased, in contrast, other planes (hkil) of ${beta}$-SiC materials and all planes of ${alpha}$-SiC materials nearly remained unchanged. In the case of ${beta}$-SiC materials, therefore, a weak texture of (0001) plane at the normal direction took place in the 8h annealed samples, resulting from grian growth. The fracture toughness values of ${alpha}$-SiC materials measured in both planes parallel and perpendicular to the hot-pressing direction were very similar. However, the fracture toughness of ${beta}$-SiC materials measured parallel to the hot-pressing direction were higher than that measured perpendicular to the hot-pressing derection, relatively, because of the texture and the microstructure anisotropy. |
| Key words:
Silicon carbide, Preferred orientation, Anisotropy, Fiber texture |
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