X-ray computed tomography of microstructure evolution during matrix impregnation and curing in unidirectional fiber beds
Abstract
Microstructural evolution during axial impregnation and subsequent curing of a preceramic polymer in unidirectional ceramic fiber beds is studied using X-ray computed tomography. The principal goal is to identify connections between void locations, void sizes, local fiber bed porosity, fiber movement, and impregnation conditions. The degree of saturation after impregnation is found to increase with instantaneous capillary number. But, because of the need to create pathways for gas escape during curing, fiber beds with high saturation after impregnation show the largest reductions in saturation during curing. Notwithstanding, saturation after curing increases with instantaneous capillary number. Voids tend to form in the largest channels between fibers, where the local fiber bed porosity is high, during both impregnation and curing. Here, void formation is typically accompanied by fiber movement that increases both the local fiber bed porosity near voids and the overall non-uniformity in the fiber bed, as measured by local porosity entropy.
- Authors:
-
- Univ. of California, Santa Barbara, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of California, Santa Barbara, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Contributing Org.:
- Office of Naval Research, National Science Foundation
- OSTI Identifier:
- 1484248
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Composites. Part A, Applied Science and Manufacturing
- Additional Journal Information:
- Journal Volume: 117; Journal Issue: C; Journal ID: ISSN 1359-835X
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; (D - Testing) CT analysis; (D - Testing) microstructural analysis; (A - Material) fibers; (E - Manufacturing/processing) matrix processing
Citation Formats
Larson, Natalie M., Cuellar, Charlene, and Zok, Frank W. X-ray computed tomography of microstructure evolution during matrix impregnation and curing in unidirectional fiber beds. United States: N. p., 2018.
Web. doi:10.1016/j.compositesa.2018.11.021.
Larson, Natalie M., Cuellar, Charlene, & Zok, Frank W. X-ray computed tomography of microstructure evolution during matrix impregnation and curing in unidirectional fiber beds. United States. https://doi.org/10.1016/j.compositesa.2018.11.021
Larson, Natalie M., Cuellar, Charlene, and Zok, Frank W. Thu .
"X-ray computed tomography of microstructure evolution during matrix impregnation and curing in unidirectional fiber beds". United States. https://doi.org/10.1016/j.compositesa.2018.11.021. https://www.osti.gov/servlets/purl/1484248.
@article{osti_1484248,
title = {X-ray computed tomography of microstructure evolution during matrix impregnation and curing in unidirectional fiber beds},
author = {Larson, Natalie M. and Cuellar, Charlene and Zok, Frank W.},
abstractNote = {Microstructural evolution during axial impregnation and subsequent curing of a preceramic polymer in unidirectional ceramic fiber beds is studied using X-ray computed tomography. The principal goal is to identify connections between void locations, void sizes, local fiber bed porosity, fiber movement, and impregnation conditions. The degree of saturation after impregnation is found to increase with instantaneous capillary number. But, because of the need to create pathways for gas escape during curing, fiber beds with high saturation after impregnation show the largest reductions in saturation during curing. Notwithstanding, saturation after curing increases with instantaneous capillary number. Voids tend to form in the largest channels between fibers, where the local fiber bed porosity is high, during both impregnation and curing. Here, void formation is typically accompanied by fiber movement that increases both the local fiber bed porosity near voids and the overall non-uniformity in the fiber bed, as measured by local porosity entropy.},
doi = {10.1016/j.compositesa.2018.11.021},
journal = {Composites. Part A, Applied Science and Manufacturing},
number = C,
volume = 117,
place = {United States},
year = {Thu Nov 22 00:00:00 EST 2018},
month = {Thu Nov 22 00:00:00 EST 2018}
}
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