| Mechanical Properties of Chemical-Vapor-Deposited Silicon Carbide using a Nanoindentation Technique |
| Jong-Ho Kim, Hyeon-Keun Lee, Ji-Yeon Park1, Weon-Ju Kim1, Do-Kyung Kim |
Department of Materials Science and Engineering, KAIST
1Nuclear Materials Research Division, KAERI |
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| ABSTRACT |
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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. |
| Key words:
Silicon carbide, Nanoindentation, Hardness, Modulus, Fracture toughness |
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