Electrical Conductivity of 2D-SiCf/CVI-SiC
| Autor: | Robert J. Shinavski, G.E. Youngblood, Edwin C. Thomsen |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Mechanical Engineering Composite number food and beverages Nanotechnology Chemical vapor deposition Type (model theory) chemistry.chemical_compound Nuclear Energy and Engineering chemistry Electrical resistance and conductance Electrical resistivity and conductivity Chemical vapor infiltration Silicon carbide General Materials Science Pyrolytic carbon Composite material Civil and Structural Engineering |
| Zdroj: | Fusion Science and Technology. 60:364-368 |
| ISSN: | 1943-7641 1536-1055 |
| DOI: | 10.13182/fst11-a12381 |
| Popis: | Electrical conductivity (EC) data for several plate forms of two-dimensional, silicon carbide composite made with chemical vapor infiltration matrix and with Hi Nicalon{trademark} type S fibers (2D-SiCf/CVI-SiC) were acquired. The composite fibers were coated with pyrocarbon (PyC) of various thicknesses (50 to 310 nm) and an outer thin ({approx}60 {mu}m) SiC 'seal coat' was applied by CVD to the infiltrated plates. The EC was highly anisotropic in the transverse and in-plane directions. In-plane EC ranged from {approx}150 to 1600 S/m, increased slowly with increasing temperature, and depended primarily on the total PyC thickness. High in-plane EC-values occur because it is dominated by conduction along the numerous, continuous PyC fiber coating pathways. Transverse EC ranged from {approx}1 to 60 S/m, and increased strongly with increasing temperature up to 800 C. The transverse EC is controlled by conduction through the interconnections of the carboncoating network within and between fiber bundles, especially at moderate temperatures ({approx}300 to 700 C). Below {approx}300 C, the electrical resistance of the pure SiC seal coat becomes increasingly more important as temperatures are further lowered. Importantly, a '3-layer series' model predicts that transverse EC-values for a standard seal-coated 2DSiCf/ CVI-SiC with a monolayer PyC fiber coating of {approx}50-nmmore » thickness will be |
| Databáze: | OpenAIRE |
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