Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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RBSC Prepared by Si Melt Infiltration into the Y2O3 Added Carbon Preform

Y2O3 첨가 탄소 프리폼에 Si 용융 침투에 의해 제조한 반응 소결 탄화규소

  • Jang, Min-Ho (Department of Advanced Materials Science & Engineering, Kumoh National Institute of Technology) ;
  • Cho, Kyeong-Sik (Department of Advanced Materials Science & Engineering, Kumoh National Institute of Technology)
  • Received : 2021.02.14
  • Accepted : 2021.02.23
  • Published : 2021.02.28
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Abstract

The conversion of carbon preforms to dense SiC by liquid infiltration is a prospectively low-cost and reliable method of forming SiC-Si composites with complex shapes and high densities. Si powder was coated on top of a 2.0wt.% Y2O3-added carbon preform, and reaction bonded silicon carbide (RBSC) was prepared by infiltrating molten Si at 1,450℃ for 1-8 h. Reactive sintering of the Y2O3-free carbon preform caused Si to be pushed to one side, thereby forming cracking defects. However, when prepared from the Y2O3-added carbon preform, a SiC-Si composite in which Si is homogeneously distributed in the SiC matrix without cracking can be produced. Using the Si + C → SiC reaction at 1,450℃, 3C and 6H SiC phases, crystalline Si, and Y2O3 were generated based on XRD analysis, without the appearance of graphite. The RBSC prepared from the Y2O3-added carbon preform was densified by increasing the density and decreasing the porosity as the holding time increased at 1,450℃. Dense RBSC, which was reaction sintered at 1,450℃ for 4 h from the 2.0wt.% Y2O3-added carbon preform, had an apparent porosity of 0.11% and a relative density of 96.8%.

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