Modeling the Transverse Thermal Conductivity of 2-D SiC{sub f} /SiC Composites Made with Woven Fabric
- Pacific Northwest National Laboratory (United States)
The hierarchical two-layer (H2L) model describes the effective transverse thermal conductivity (k{sub eff}) of a two-dimensional (2-D) SiC{sub f} /SiC composite plate made from stacked and infiltrated woven fabric layers in terms of constituent properties and microstructural and architectural variables. The H2L model includes the effects of fiber-matrix interfacial conductance, high-fiber packing fractions within individual tows, and the nonuniform nature of 2-D fabric/matrix layers that usually include a significant amount of interlayer porosity. Previously, H2L model k{sub eff} predictions were compared to measured values for two versions of 2-D Hi-Nicalon{sup TM}/pyrocarbon (PyC)/isothermal chemical vapor infiltration (ICVI)-SiC composite, one with a 'thin' (0.11-{mu}m) and the other with a 'thick' (1.04-{mu}m) PyC fiber coating, and for a 2-D Tyranno{sup TM} SA/thin PyC/forced flow chemical vapor infiltration SiC composite. In this study, H2L model k{sub eff} predictions were compared to measured values for a 2-D SiC{sub f} /SiC composite made using the ICVI process with Hi-Nicalon type S fabric and a thin PyC fiber coating. The values of k{sub eff} determined for the latter composite were significantly greater than the k{sub eff} values determined for the composites made with either the Hi-Nicalon or the Tyranno SA fabrics. Differences in k{sub eff} values were expected for the different fiber types, but major differences also were due to observed microstructural and architectural variations between the composite systems, and as predicted by the H2L model.
- OSTI ID:
- 20849712
- Journal Information:
- Fusion Science and Technology, Journal Name: Fusion Science and Technology Journal Issue: 4 Vol. 45; ISSN 1536-1055
- Country of Publication:
- United States
- Language:
- English
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Modeling the Transverse Thermal Conductivity of 2-D SiCf/SiC Composites Made with Woven Fabric
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