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A model has been developed to predict the microstructure of the carbon matrix deposited during forced flow-thermal gradient chemical vapor infiltration (FCVI). This method employs previous thermodynamic-microstructure and densification models to determine conditions throughout the preform as a function of time. The model was verified by comparison with samples prepared over a range of deposition...
The feasibility of using organoboranes as precursors for the deposition of boron-carbon thin films in a hot-wall CVD furnace was investigated. The reagents studied include trimethylborane, triethylborane, and tributylborane. Triethylborane was the most suitable reagent in that higher boron to carbon ratios were obtained.
A one-dimensional model was developed for the forced flow-thermal gradient chemical vapor infiltration of carbon/carbon composites. The infiltration time predicted by the model agreed very well with experiments, where propylene and propane were used as the hydrocarbon source. The model was also validated by interrupting the infiltration and comparing predicted with observed densities.
A 2 3 factorial statistically designed experiment was used to study fabrication of carbon/carbon composites using the forced flow-thermal gradient chemical vapor infiltration process. Propane, diluted with hydrogen, was used as the feed. The independent variables were the temperature of the bottom of the preform holder, the concentration of the reagent, and the total flow rate. The response...
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