Effects of temperature inversion on densification in chemical vapor infiltration

Ramanuj, Vimal; Li, Mengnan; Ge, Wenjun; Sankaran, Ramanan; She, Ying; Dardas, Zissis

doi:10.1111/jace.19802

Title: Effects of temperature inversion on densification in chemical vapor infiltration

Journal Article · 15 May 2024 · Journal of the American Ceramic Society

DOI: https://doi.org/10.1111/jace.19802 · OSTI ID:2429862

^[1]; Li, Mengnan ^[1];

^[1];

^[1]; She, Ying ^[2]; Dardas, Zissis ^[2]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Raytheon Technologies Research Center, East Hartford, CT (United States)

In a classical chemical vapor infiltration (CVI) process, the competing effects of chemical kinetics and reagent gas transport lead to non–uniform depositions such that outer layers of a preform densify faster leaving the core highly porous. Currently, CVI must be performed at a sufficiently low temperature to achieve good densification quality which leads to high processing time and cost. Volumetric heating of the preform, especially through microwaves, can create temperature inversion such that the core is hotter than the outer surface and potentially, overcome the challenges associated with isothermal CVI. Direct numerical simulations (DNS) of densification under various such temperature distributions indicate that microwave heating in CVI processing can lead to better (uniform) densification of porous preforms. Here the role of key parameters describing the temperature distributions on the densification behavior is investigated. Strategic temporal control of the temperature distribution shows that processing times can be reduced by almost half while maintaining a good densification quality similar to that of low–temperature isothermal processing. Inside–out densification due to the inverted temperature profile is a key distinguishing characteristic of microwave assisted CVI.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO); USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2429862

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 9 Vol. 107; ISSN 0002-7820

Publisher:: American Ceramic SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ceramic matrix composites
chemical vapor infiltration
kinetics
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Title: Effects of temperature inversion on densification in chemical vapor infiltration

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