Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Mechanical Properties of Chemical-Vapor-Deposited Silicon Carbide using a Nanoindentation Technique

  • Kim, Jong-Ho (Department of Materials Science and Engineering, KAIST) ;
  • Lee, Hyeon-Keun (Department of Materials Science and Engineering, KAIST) ;
  • Park, Ji-Yeon (Nuclear Materials Research Division, KAERI) ;
  • Kim, Weon-Ju (Nuclear Materials Research Division, KAERI) ;
  • Kim, Do-Kyung (Department of Materials Science and Engineering, KAIST)
  • Published : 2008.09.30
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Abstract

The mechanical properties of silicon carbide deposited by chemical vapor deposition process onto a graphite substrate are studied using nanoindentation techniques. The silicon carbide coating was fabricated in a chemical vapor deposition process with different microstructures and thicknesses. A nanoindentation technique is preferred because it provides a reliable means to measure the mechanical properties with continuous load-displacement recording. Thus, a detailed nanoindentation study of silicon carbide coatings on graphite structures was conducted using a specialized specimen preparation technique. The mechanical properties of the modulus, hardness and toughness were characterized. Silicon carbide deposited at $1300^{\circ}C$ has the following values: E=316 GPa, H=29 GPa, and $K_c$=9.8 MPa $m^{1/2}$; additionally, silicon carbide deposited at $1350^{\circ}C$ shows E=283 GPa, H=23 GPa, and $K_c$=6.1 MPa $m^{1/2}$. The mechanical properties of two grades of SiC coating with different microstructures and thicknesses are discussed.

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References

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