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Title: Gelcasting low-carbon B4C for cermets (Allison intern SULI paper)

Abstract

A boron carbide (B 4C) gelcasting suspension involving melamine formaldehyde (MF) resin was developed to obtain green bodies with low carbon after pyrolysis. MF resin allows highly complicated B 4C parts to be produced with little to no shrinkage when gelcast into molds. A MF binder content of ~7.5 wt % consistently produced green bodies with sufficient strength to withstand demolding and handling. Variations in B 4C particle size, curing temperature, and pH were investigated in order to optimize the suspension for casting. Resin pyrolysis trials showed that 90.0 ± 0.9 wt % of resin mass was lost during pyrolysis, corresponding to < 1 wt % of binder residual in the overall green bodies. The minimal carbon content in the green bodies is favorable for the infiltration of aluminum into open pore spaces. Due to the high hardness of B 4C and the ductility of aluminum, the ceramic-metal (cermet) composite formed is ideal for applications such as light-weight armors.

Authors:
 [1];  [2];  [2];  [2];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Functional Materials Synthesis Group; Univ. of California, Berkeley, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Functional Materials Synthesis Group
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1474333
Report Number(s):
LLNL-TR-756666
944093
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING

Citation Formats

Pearson, Allison, Lu, Ryan, DuFrane, Wyatt, Landingham, Richard, and Kuntz, Joshua. Gelcasting low-carbon B4C for cermets (Allison intern SULI paper). United States: N. p., 2018. Web. doi:10.2172/1474333.
Pearson, Allison, Lu, Ryan, DuFrane, Wyatt, Landingham, Richard, & Kuntz, Joshua. Gelcasting low-carbon B4C for cermets (Allison intern SULI paper). United States. https://doi.org/10.2172/1474333
Pearson, Allison, Lu, Ryan, DuFrane, Wyatt, Landingham, Richard, and Kuntz, Joshua. Thu . "Gelcasting low-carbon B4C for cermets (Allison intern SULI paper)". United States. https://doi.org/10.2172/1474333. https://www.osti.gov/servlets/purl/1474333.
@article{osti_1474333,
title = {Gelcasting low-carbon B4C for cermets (Allison intern SULI paper)},
author = {Pearson, Allison and Lu, Ryan and DuFrane, Wyatt and Landingham, Richard and Kuntz, Joshua},
abstractNote = {A boron carbide (B4C) gelcasting suspension involving melamine formaldehyde (MF) resin was developed to obtain green bodies with low carbon after pyrolysis. MF resin allows highly complicated B4C parts to be produced with little to no shrinkage when gelcast into molds. A MF binder content of ~7.5 wt % consistently produced green bodies with sufficient strength to withstand demolding and handling. Variations in B4C particle size, curing temperature, and pH were investigated in order to optimize the suspension for casting. Resin pyrolysis trials showed that 90.0 ± 0.9 wt % of resin mass was lost during pyrolysis, corresponding to < 1 wt % of binder residual in the overall green bodies. The minimal carbon content in the green bodies is favorable for the infiltration of aluminum into open pore spaces. Due to the high hardness of B4C and the ductility of aluminum, the ceramic-metal (cermet) composite formed is ideal for applications such as light-weight armors.},
doi = {10.2172/1474333},
url = {https://www.osti.gov/biblio/1474333}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {8}
}