Characteristics and Processing of Hydrogen-Treated Copper Powders for EB-PBF Additive Manufacturing
Abstract
The fabrication of high purity copper using additive manufacturing has proven difficult because of oxidation of the powder feedstock. Here, we present work on the hydrogen heat treatment of copper powders for electron beam powder bed fusion (EB-PBF), in order to enable the fabrication of high purity copper components for applications such as accelerator components and vacuum electronic devices. Copper powder with varying initial oxygen contents were hydrogen heat-treated and characterized for their chemistry, morphology, and microstructure. Higher initial oxygen content powders were found to not only reduce surface oxides, but also reduce oxides along the grain boundaries and form trapped H2O vapor inside the particles. The trapped H2O vapor was verified by thermogravimetric analysis (TGA) and residual gas analysis (RGA) while melting. The mechanism of the H2O vapor escaping the particles was determined by in-situ SEM heated stage experiments, where the particles were observed to crack along the grain boundaries. To determine the effect of the EB-PBF processing on the H2O vapor, the thermal simulation and the validation of single melt track width wafers were conducted along with melting single layer discs for chemistry analysis. A high speed video of the EB-PBF melting was performed in order to determinemore »
- Authors:
-
- North Carolina State Univ., Raleigh, NC (United States)
- RadiaBeam, Santa Monica, CA (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1582220
- Grant/Contract Number:
- AC02-76SF00515; N0025316P0261; N66001-16-4044
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Sciences
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 19; Journal ID: ISSN 2076-3417
- Publisher:
- MDPI
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; electron beam melting; copper; hydrogen treatment; high purity copper
Citation Formats
Ledford, Christopher, Rock, Christopher, Carriere, Paul, Frigola, Pedro, Gamzina, Diana, and Horn, Timothy. Characteristics and Processing of Hydrogen-Treated Copper Powders for EB-PBF Additive Manufacturing. United States: N. p., 2019.
Web. doi:10.3390/app9193993.
Ledford, Christopher, Rock, Christopher, Carriere, Paul, Frigola, Pedro, Gamzina, Diana, & Horn, Timothy. Characteristics and Processing of Hydrogen-Treated Copper Powders for EB-PBF Additive Manufacturing. United States. https://doi.org/10.3390/app9193993
Ledford, Christopher, Rock, Christopher, Carriere, Paul, Frigola, Pedro, Gamzina, Diana, and Horn, Timothy. Tue .
"Characteristics and Processing of Hydrogen-Treated Copper Powders for EB-PBF Additive Manufacturing". United States. https://doi.org/10.3390/app9193993. https://www.osti.gov/servlets/purl/1582220.
@article{osti_1582220,
title = {Characteristics and Processing of Hydrogen-Treated Copper Powders for EB-PBF Additive Manufacturing},
author = {Ledford, Christopher and Rock, Christopher and Carriere, Paul and Frigola, Pedro and Gamzina, Diana and Horn, Timothy},
abstractNote = {The fabrication of high purity copper using additive manufacturing has proven difficult because of oxidation of the powder feedstock. Here, we present work on the hydrogen heat treatment of copper powders for electron beam powder bed fusion (EB-PBF), in order to enable the fabrication of high purity copper components for applications such as accelerator components and vacuum electronic devices. Copper powder with varying initial oxygen contents were hydrogen heat-treated and characterized for their chemistry, morphology, and microstructure. Higher initial oxygen content powders were found to not only reduce surface oxides, but also reduce oxides along the grain boundaries and form trapped H2O vapor inside the particles. The trapped H2O vapor was verified by thermogravimetric analysis (TGA) and residual gas analysis (RGA) while melting. The mechanism of the H2O vapor escaping the particles was determined by in-situ SEM heated stage experiments, where the particles were observed to crack along the grain boundaries. To determine the effect of the EB-PBF processing on the H2O vapor, the thermal simulation and the validation of single melt track width wafers were conducted along with melting single layer discs for chemistry analysis. A high speed video of the EB-PBF melting was performed in order to determine the effect of the trapped H2O vapor on the melt pool. Finally, solid samples were fabricated from hydrogen-treated copper powder, where the final oxygen content measured ~50 wt. ppm, with a minimal residue hydrogen content, indicating the complete removal of trapped H2O vapor from the solid parts.},
doi = {10.3390/app9193993},
journal = {Applied Sciences},
number = 19,
volume = 9,
place = {United States},
year = {Tue Sep 24 00:00:00 EDT 2019},
month = {Tue Sep 24 00:00:00 EDT 2019}
}
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