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Title: 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:
 [1];  [2];  [3]
  1. Univ. of California, Santa Barbara, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. 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) (SC-22)
Contributing Org.:
Office of Naval Research, National Science Foundation
OSTI Identifier:
1484248
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article: 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. doi: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. doi:10.1016/j.compositesa.2018.11.021.
@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}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 22, 2019
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