Complex shaped boron carbides from negative additive manufacturing
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
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.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1438673
- Report Number(s):
- LLNL-JRNL-748179
- Journal Information:
- Materials & Design, Vol. 148; ISSN 0264-1275
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Study on formability and strain hardening index: influence of particle size of boron carbide (B 4 C) in magnesium matrix composites fabricated by powder metallurgy technique
|
journal | January 2020 |
Similar Records
A comparison study on the densification behavior and mechanical properties of gelcast vs conventionally formed B{sub 4}C sintered conventionally and by microwaves
Near net shape forming processes for chemically prepared zinc oxide varistors.