Chemical vapor infiltration of additively manufactured preforms: Pore-resolved simulations and experimental validation

Ramanuj, Vimal; Sankaran, Ramanan; Jolly, Brian C.; Schumacher, Austin; Mitchell, David

doi:10.1111/jace.18226

Chemical vapor infiltration of additively manufactured preforms: Pore-resolved simulations and experimental validation

Journal Article · Wed Dec 08 23:00:00 EST 2021 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.18226· OSTI ID:1837874

^[1]; ^[1]; Jolly, Brian C. ^[1]; Schumacher, Austin ^[1]; ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The densification of additively manufactured porous preforms by chemical vapor infiltration (CVI) is studied using pore-resolved simulations and experiments. Experimentally, 3D printed silicon carbide (SiC) preforms are subject to CVI synthesis using methyltrichlorosilane (MTS) precursor to obtain high purity SiC/SiC composites. Optical images of the cross sections of the processed preforms are analyzed to obtain the spatial porosity distribution. The numerical method is based on a level set formulation to capture the spatial distribution and time evolution of the pore scale microstructural characteristics. The coupled transport and kinetic effects are represented using a dimensionless Thiele modulus. Simulations are initialized using representative synthetic preform geometries comprising of packed particles based on the size distribution of the powder used for 3D printing. The simulation results are validated against the experimental observations in terms of total density and the distribution of residual porosity. The densification characteristics, porosity classification, concentration profiles, and structure functions are analyzed as functions of processing temperature and Thiele modulus.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1837874

Alternate ID(s):: OSTI ID: 1835177

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: N/A Vol. N/A; ISSN 0002-7820

Publisher:: American Ceramic SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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