Surface Characterization of Depleted Uranium–Molybdenum to Determine Surface Coating Compatibility

Terry A. Ring; Byung Sang Choi; J. Paulo Perez; Brian Van Devener; Randy C. Polson; Douglas Crawford; Dennis Keiser; Daniel Wachs

doi:10.1080/00295450.2018.1542252

Surface Characterization of Depleted Uranium–Molybdenum to Determine Surface Coating Compatibility

Terry A. Ring, Byung Sang Choi, J. Paulo Perez, Brian Van Devener, Randy C. Polson, Douglas Crawford, Dennis Keiser, Daniel Wachs

Target Design, Analysis, and Qualificati

Research output: Contribution to journal › Article › peer-review

Abstract

Scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy have been used to characterize the surface of depleted uranium molybdenum (DU-Mo) alloys as a chemical surrogate to determine potential challenges with the surfaces of manufactured and stored U-Mo foils and powders. Even when stored and shipped in an inert atmosphere, U-Mo has a tenacious surface contamination of oxygen and carbon. The 8 at. % molybdenum (DU-8Mo) powder and 10 at. % molybdenum (DU-10Mo) foil samples have surface contamination of oxygen and carbon in different ratios that is hundreds to thousands of nanometers thick. The DU-8Mo powder sample has been stored in an inert atmosphere and as a result has a lower carbon-to-oxygen ratio at the surface than the DU-10Mo foil sample that was stored in air. This surface contamination has not been removed by up to 20 min of argon ion sputtering nor with 5% hydrogen in argon heat treatment for up to 96 h at 950°C.

Original language	English
Pages (from-to)	801-818
Number of pages	18
Journal	Nuclear Technology
Volume	205
Issue number	6
DOIs	https://doi.org/10.1080/00295450.2018.1542252
State	Published - Jun 3 2019

Funding

This work was graciously funded by INL under contract award number 150387 of the Global Threat Reduction Initiative, United States High Performance Research Reactor Fuel Development: Microstructure and Surface Characterization, project number 25228.

Keywords

Depleted uranium–molybdenum alloy
surface analysis

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10.1080/00295450.2018.1542252

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title = "Surface Characterization of Depleted Uranium–Molybdenum to Determine Surface Coating Compatibility",

abstract = "Scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy have been used to characterize the surface of depleted uranium molybdenum (DU-Mo) alloys as a chemical surrogate to determine potential challenges with the surfaces of manufactured and stored U-Mo foils and powders. Even when stored and shipped in an inert atmosphere, U-Mo has a tenacious surface contamination of oxygen and carbon. The 8 at. % molybdenum (DU-8Mo) powder and 10 at. % molybdenum (DU-10Mo) foil samples have surface contamination of oxygen and carbon in different ratios that is hundreds to thousands of nanometers thick. The DU-8Mo powder sample has been stored in an inert atmosphere and as a result has a lower carbon-to-oxygen ratio at the surface than the DU-10Mo foil sample that was stored in air. This surface contamination has not been removed by up to 20 min of argon ion sputtering nor with 5% hydrogen in argon heat treatment for up to 96 h at 950°C.",

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author = "Ring, {Terry A.} and Choi, {Byung Sang} and Perez, {J. Paulo} and {Van Devener}, Brian and Polson, {Randy C.} and Douglas Crawford and Dennis Keiser and Daniel Wachs",

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year = "2019",

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doi = "10.1080/00295450.2018.1542252",

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AU - Ring, Terry A.

AU - Choi, Byung Sang

AU - Perez, J. Paulo

AU - Van Devener, Brian

AU - Polson, Randy C.

AU - Crawford, Douglas

AU - Keiser, Dennis

AU - Wachs, Daniel

PY - 2019/6/3

Y1 - 2019/6/3

N2 - Scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy have been used to characterize the surface of depleted uranium molybdenum (DU-Mo) alloys as a chemical surrogate to determine potential challenges with the surfaces of manufactured and stored U-Mo foils and powders. Even when stored and shipped in an inert atmosphere, U-Mo has a tenacious surface contamination of oxygen and carbon. The 8 at. % molybdenum (DU-8Mo) powder and 10 at. % molybdenum (DU-10Mo) foil samples have surface contamination of oxygen and carbon in different ratios that is hundreds to thousands of nanometers thick. The DU-8Mo powder sample has been stored in an inert atmosphere and as a result has a lower carbon-to-oxygen ratio at the surface than the DU-10Mo foil sample that was stored in air. This surface contamination has not been removed by up to 20 min of argon ion sputtering nor with 5% hydrogen in argon heat treatment for up to 96 h at 950°C.

AB - Scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy have been used to characterize the surface of depleted uranium molybdenum (DU-Mo) alloys as a chemical surrogate to determine potential challenges with the surfaces of manufactured and stored U-Mo foils and powders. Even when stored and shipped in an inert atmosphere, U-Mo has a tenacious surface contamination of oxygen and carbon. The 8 at. % molybdenum (DU-8Mo) powder and 10 at. % molybdenum (DU-10Mo) foil samples have surface contamination of oxygen and carbon in different ratios that is hundreds to thousands of nanometers thick. The DU-8Mo powder sample has been stored in an inert atmosphere and as a result has a lower carbon-to-oxygen ratio at the surface than the DU-10Mo foil sample that was stored in air. This surface contamination has not been removed by up to 20 min of argon ion sputtering nor with 5% hydrogen in argon heat treatment for up to 96 h at 950°C.

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Surface Characterization of Depleted Uranium–Molybdenum to Determine Surface Coating Compatibility

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