Al-B-C 조제 β-SiC의 스파크 플라즈마 소결에 미치는 α-SiC seed 첨가 영향: 미세 구조 변화Influence of α-SiC Seed Addition on Spark Plasma Sintering of β-SiC with Al-B-C: Microstructural Development
- Other Titles
- Influence of α-SiC Seed Addition on Spark Plasma Sintering of β-SiC with Al-B-C: Microstructural Development
- Authors
- 조경식; 이현권; 이상우
- Issue Date
- 2010
- Publisher
- 한국분말야금학회
- Keywords
- SiC; Al-B-C additive; Liquid phase sintering; Spark plasma sintering; Microstructure
- Citation
- 한국분말야금학회지, v.17, no.1, pp.13 - 22
- Journal Title
- 한국분말야금학회지
- Volume
- 17
- Number
- 1
- Start Page
- 13
- End Page
- 22
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/2827
- ISSN
- 1225-7591
- Abstract
- The unique features of spark plasma sintering process are the possibilities of a very fast heating rate and a short holding time to obtain fully dense materials. β-SiC powder with 0, 2, 6, 10 wt% of α-SiC particles (seeds) and 4 wt% of Al-B-C (sintering aids) were spark plasma sintered at 1700-1850oC for 10min. The heating rate, applied pressure and sintering atmosphere were kept at 100oC/min, 40 MPa and a flowing Ar gas (500 CC/min). Microstructural development of SiC as function of seed content and temperature during spark plasma sintering was investigated quantitatively and statistically using image analysis.
Quantitative image analyses on the sintered SiC ceramics were conducted on the grain size, aspect ratio and grain size distribution of SiC. The microstructure of SiC sintered up to 1700oC consisted of equiaxed grains.
In contrast, the growth of large elongated SiC grains in small matrix grains was shown in sintered bodies at 1750oC and the plate-like grains interlocking microstructure had been developed by increasing sintering temperature.
The introduction of α-SiC seeds into β-SiC accelerated the grain growth of elongated grains during sintering, resulting in the plate-like grains interlocking microstructure. In the α-SiC seeds added in β-SiC,the rate of grain growth decreased with α-SiC seed content, however, bulk density and aspect ratio of grains in sintered body increased.
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Collections - Department of Materials Science and Engineering > 1. Journal Articles
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