| Al-B-C 첨가 탄화규소의 스파크 플라즈마 소결에 의한 미세구조 발달 |
| 조경식, 이광순, 이현권, 이상진1, 최헌진2 |
금오공과대학교 신소재시스템공학부
1목포대학교 신소재공학과
2연세대학교 신소재공학부 |
| Microstructure Development of Spark Plasma Sintered Silicon Carbide with Al-B-C |
| Kyeong-Sik Cho, Kwang-Soon Lee, Hyun-Kwuon Lee, Sang-Jin Lee1, Heon-Jin Choi2 |
School of Advanced Materials and System Engineering, Kumoh National Institute of Technology
1Department of Advanced Materials Science and Engineering, Mokpo National University
2School of Advanced Materials Engineering, Yonsei University |
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| ABSTRACT |
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Densification of SiC powder with additives of total amount of2, 4, 8 $wt%$ Al-B-C was carried out by Spark Plasma Sintering (SPS). The unique features of the process are the possibilities of a very fast heating rate and a short holding time to obtain fully dense materials. The heating rate and applied pressure were kept at $100^{circ}C/min$ and 40 MPa, while the sintering temperature and holding time varied from 1700 - $1800^{circ}C$ for 10 - 40 min, respectively. The SPS-sintered specimens with different amount of Al-B-C at $1800^{circ}C$ reached near-theoretical density. The $3C{rightarrow}6H,;15R{rightarrow}4H$ phase transformation of SiC was enhanced by increasing the additive amount. The microstructure of SiC sintered up to $1750^{circ}C$ consisted of fine equiaxed grains. In contrast, the growth of large elongated grains in small matrix grains was shown in sintered bodies at $1800^{circ}C$, and the plate-like grains interlocking microstructure had been developed by increasing the holding time at $1800^{circ}C$. The grain growth rate decreases with increasing amount of Al-B-C in SiC starting powder, however, the both of volume fraction and aspect ratio of large grains in sintered body increased. |
| Key words:
SiC, Spark plasma sintering, Rapid densification, Interlocking microstructure |
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