한국재료학회지 (Korean Journal of Materials Research)

  • 제31권5호
  • /
  • Pages.301-311
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  • 2021
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
권호 표지
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완전 탄소 프리폼으로부터 Si 용융 침투에 의해 제조한 반응 소결 탄화규소의 치밀화에 미치는 Y2O3 첨가량의 영향

Effect of Y2O3 Additive Amount on Densification of Reaction Bonded Silicon Carbides Prepared by Si Melt Infiltration into All Carbon Preform

  • Cho, Kyeong-Sik (Department of Advanced Materials Science & Engineering, Kumoh National Institute of Technology) ;
  • Jang, Min-Ho (Department of Advanced Materials Science & Engineering, Kumoh National Institute of Technology)
  • 투고 : 2021.02.15
  • 심사 : 2021.05.10
  • 발행 : 2021.05.27
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초록

The conversion of all carbon preforms to dense SiC by liquid infiltration can become a low-cost and reliable method to form SiC-Si composites of complex shape and high density. Reactive sintered silicon carbide (RBSC) is prepared by covering Si powder on top of 0.5-5.0 wt% Y2O3-added carbon preforms at 1,450 and 1,500℃ for 2 hours; samples are analyzed to determine densification. Reactive sintering from the Y2O3-free carbon preform causes Si to be pushed to one side and cracking defects occur. However, when prepared from the Y2O3-added carbon preform, an SiC-Si composite in which Si is homogeneously distributed in the SiC matrix without cracking can be produced. Using the Si + C = SiC reaction, 3C and 6H of SiC, crystalline Si, and Y2O3 phases are detected by XRD analysis without the appearance of graphite. As the content of Y2O3 in the carbon preform increases, the prepared RBSC accelerates the SiC conversion reaction, increasing the density and decreasing the pores, resulting in densification. The dense RBSC obtained by reaction sintering at 1,500 ℃ for 2 hours from a carbon preform with 2.0 wt% Y2O3 added has 0.20 % apparent porosity and 96.9 % relative density.

키워드

과제정보

This research was supported by Kumoh National Institute of Technology (2019-104-017)

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