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J. Korean Ceram. Soc. > Volume 44(7); 2007 > Article
Journal of the Korean Ceramic Society 2007;44(7): 381.
doi: https://doi.org/10.4191/kcers.2007.44.7.381
침윤된 Si 및 성형체내 Carbon Source의 양이 반응소결 탄화규소 다공체의 기공률 및 파괴강도에 미치는 영향
윤성호, Phung Nhut Tan1, 김영도, 박상환2
한양대학교 신소재공학과
1성균관대학교 신소재공학과
2한국과학기술연구원 재료기술연구본부
Effects of Amounts of Carbon Source and Infiltrated Si on the Porosity and Fracture Strength of Porous Reaction Bonded SiC
Sung-Ho Yun, Phung Nhut Tan1, Young-Do Kim, Sang-Whan Park2
Department Materials Science and Engineering, Hanyang Univ.
1Department Materials Science and Engineering, Sungkyunkwan Univ.
2Korea Institute of Science and Technology
A porous reaction bonded silicon carbide (RBSC) was fabricated by a molten Si infiltration method. The porosity and flexural strength of porous RBSC fabricated in this study were dependent upon the amount of carbon source used in the SiC/carbon preform as well as the amount of Si infiltrated into the SiC/carbon preform. The porosity and flexural strength of porous RBSC were in the range of $20 vo1.{sim}49 vo1.%$ and $38{sim}61 MPa$, respectively. With increase of carbon contents and molten Si for infiltration, volume fraction of the pores was gradually decreased, and flexural strength was increased. The porous RBSCs fabricated with the same amount of molten Si show less residual Si around neck with increase of carbon source, as well as a new SiC was formed around neck which resulted in the decreased porosity and improvement of the flexural strength. In addition, decrease of the porosity and increase of the flexural strength were also obtained by increase of the amount of molten Si with the same amount of carbon source. However, it was found that the flexural strength of porous RBSC depends on the porosity rather than the amount of the newly formed SiC in neck phase between SiC particles used as a starting material.
Key words: Porous RBSC, Infiltration, Si melt, Silicon carbide
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