Dynamics of chemical vapor infiltration in carbon fiber bundles

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · Journal of Advanced Materials

OSTI ID:420929

Currier, R P; Devlin, D J; Morzinski, J ^[1]

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1. Los Alamos National Lab., NM (United States)

A practical one-dimensional model is developed for chemical vapor infiltration in cylindrical fiber bundles. Modeling assumptions are supported by new experimental data which support neglect of reactant influx through the bundle ends. The model assumes deposition rates are proportional to accessible solid surface area and reactant concentration. The evolution of the accessible fraction of the solid phase is obtained using scaled particle theory expressions for partially overlapping cylinders. Power law relationships suggested by percolation theory are used to relate the fraction of accessible porosity to the total porosity. Physical arguments are employed to estimate the power law parameters. Previously published data on the infiltration of carbon fiber bundles (using methane as a matrix precursor) are used to estimate the kinetic parameters. Favorable agreement is then seen between experimentally measured weight gain data and pseudo-steady-state calculations. The model also accounts for the sensitivity to initial bundle porosity and accurately predicts final bundle porosities over a range of temperatures. 37 refs., 10 figs.

• OSTI ID: 420929
• Journal Information: Journal of Advanced Materials, Journal Name: Journal of Advanced Materials Journal Issue: 4 Vol. 27; ISSN JADMEK; ISSN 1070-9789
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
99 GENERAL AND MISCELLANEOUS
CARBON FIBERS
COMPOSITE MATERIALS
DIFFUSION
MATHEMATICAL MODELS
PERMEABILITY
PHYSICAL PROPERTIES
POROSITY
REINFORCED MATERIALS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
VAPORS