Modeling Microwave-Enhanced Chemical Vapor Infiltration Process for Preventing Premature Pore Closure

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

doi:10.1115/1.4067067

Modeling Microwave-Enhanced Chemical Vapor Infiltration Process for Preventing Premature Pore Closure

Journal Article · Mon Dec 16 00:00:00 EST 2024 · ASME Journal of Heat and Mass Transfer

DOI:https://doi.org/10.1115/1.4067067· OSTI ID:2483418

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

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

The chemical vapor infiltration (CVI) process involves infiltrating a porous preform with reacting gases that undergo chemical transformation at high temperatures to deposit the ceramic phase within the pores, ultimately leading to a dense composite. The conventional CVI process in composite manufacturing needs to follow an isothermal approach to minimize temperature differences between the external and internal surfaces of the preform, ensuring that reactive gases infiltrate internal pores before external surfaces seal. Here, this study addresses the challenge of premature pore closure in CVI processes through microwave heating. A frequency-domain microwave solver is developed in OpenFOAM to investigate volumetric heating mechanisms within the preform. Through numerical studies, we demonstrate the capability of microwave heating of creating an inside-out temperature inversion. This inversion accelerates reactions proximal to the preform center, effectively mitigating the risk of premature external pore closure and ensuring uniform densification. The results reveal a significant enhancement in temperature inversion when high-permittivity reflectors are incorporated to generate resonant waves. This microwave heating strategy is then coupled with high-fidelity direct numerical simulation (DNS) of reacting flow, enabling the analysis of resulting densification processes. The DNS includes detailed chemistry and realistic diffusion coefficients. The numerical results can be used to estimate the impact of microwave-induced temperature inversion on densification in productions.

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This content will become publicly available on Tue Dec 16 00:00:00 EST 2025

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

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2483418

Journal Information:: ASME Journal of Heat and Mass Transfer, Vol. 147, Issue 4; ISSN 2832-8450

Publisher:: ASMECopyright Statement

Country of Publication:: United States

Language:: English

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