Measurement of gas transport properties for chemical vapor infiltration
- Georgia Inst. of Tech., Atlanta, GA (United States). School of Materials Science and Engineering
In the chemical vapor infiltration (CVI) process for fabricating ceramic matrix composites (CMCs), transport of gas phase reactant into the fiber preform is a critical step. The transport can be driven by pressure or by concentration. This report describes methods for measuring this for CVI preforms and partially infiltrated composites. Results are presented for Nicalon fiber cloth layup preforms and composites, Nextel fiber braid preforms and composites, and a Nicalon fiber 3-D weave composite. The results are consistent with a percolating network model for gas transport in CVI preforms and composites. This model predicts inherent variability in local pore characteristics and transport properties, and therefore, in local densification during processing; this may lead to production of gastight composites.
- Research Organization:
- Oak Ridge National Lab., TN (United States); Georgia Inst. of Tech., Atlanta, GA (United States). School of Materials Science and Engineering
- Sponsoring Organization:
- USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 441120
- Report Number(s):
- ORNL/Sub--87-00184/06; ON: DE97051435
- Country of Publication:
- United States
- Language:
- English
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