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Title: Complex shaped boron carbides from negative additive manufacturing

Abstract

In this paper, complex shaped boron carbide with carbon (B4C/C) at near-full densities were achieved for the first time using negative additive manufacturing techniques via gelcasting. Negative additive manufacturing involves 3D printing of sacrificial molds used for casting negative copies. B4C powder distributions and rheology of suspensions were optimized to successfully cast complex shapes. In addition to demonstrating scalability of these complex geometries, hierarchically meso-porous structures were also shown to be possible from this technique. Resorcinol-Formaldehyde (RF) polymer was selected as the gelling agent and can also pyrolyze into a carbon aerogel network to act as the sintering aid for B4C. Finally, due to the highly effective distribution of in situ carbon for the B4C matrix, near-full sintered density of 97–98% of theoretical maximum density was achieved.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1438673
Report Number(s):
LLNL-JRNL-748179
Journal ID: ISSN 0264-1275
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Materials & Design
Additional Journal Information:
Journal Volume: 148; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; boron carbide; gelcasting; negative additive manufacturing; resorcinol formaldehyde; sintering

Citation Formats

Lu, Ryan, Chandrasekaran, Swetha, Du Frane, Wyatt L., Landingham, Richard L., Worsley, Marcus A., and Kuntz, Joshua D. Complex shaped boron carbides from negative additive manufacturing. United States: N. p., 2018. Web. doi:10.1016/j.matdes.2018.03.026.
Lu, Ryan, Chandrasekaran, Swetha, Du Frane, Wyatt L., Landingham, Richard L., Worsley, Marcus A., & Kuntz, Joshua D. Complex shaped boron carbides from negative additive manufacturing. United States. https://doi.org/10.1016/j.matdes.2018.03.026
Lu, Ryan, Chandrasekaran, Swetha, Du Frane, Wyatt L., Landingham, Richard L., Worsley, Marcus A., and Kuntz, Joshua D. Tue . "Complex shaped boron carbides from negative additive manufacturing". United States. https://doi.org/10.1016/j.matdes.2018.03.026. https://www.osti.gov/servlets/purl/1438673.
@article{osti_1438673,
title = {Complex shaped boron carbides from negative additive manufacturing},
author = {Lu, Ryan and Chandrasekaran, Swetha and Du Frane, Wyatt L. and Landingham, Richard L. and Worsley, Marcus A. and Kuntz, Joshua D.},
abstractNote = {In this paper, complex shaped boron carbide with carbon (B4C/C) at near-full densities were achieved for the first time using negative additive manufacturing techniques via gelcasting. Negative additive manufacturing involves 3D printing of sacrificial molds used for casting negative copies. B4C powder distributions and rheology of suspensions were optimized to successfully cast complex shapes. In addition to demonstrating scalability of these complex geometries, hierarchically meso-porous structures were also shown to be possible from this technique. Resorcinol-Formaldehyde (RF) polymer was selected as the gelling agent and can also pyrolyze into a carbon aerogel network to act as the sintering aid for B4C. Finally, due to the highly effective distribution of in situ carbon for the B4C matrix, near-full sintered density of 97–98% of theoretical maximum density was achieved.},
doi = {10.1016/j.matdes.2018.03.026},
journal = {Materials & Design},
number = ,
volume = 148,
place = {United States},
year = {2018},
month = {3}
}

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