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http://dx.doi.org/10.4150/KPMI.2021.28.1.51

RBSC Prepared by Si Melt Infiltration into the Y2O3 Added Carbon Preform  

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)
Publication Information
Journal of Powder Materials / v.28, no.1, 2021 , pp. 51-58 More about this Journal
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%.
Keywords
RBSC (reaction-bonded silicon carbide); Carbon preform; Liquid infiltration; Relative density;
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