Record link: 
http://hdl.handle.net/20.500.12708/139903
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Title: 
Functionalization of metallic powder for performance enhancement
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Citation: 
Unnikrishnan, R., Gardy, D. J., Spencer, B., Kurinjimala, R., Dey, A., Nekouie, V., Irukuvarghula, S., Hassanpour, A., Eisenmenger-Sittner, C., Francis, J. A., & Preuss, M. (2022). Functionalization of metallic powder for performance enhancement. Materials & Design, 221, Article 110900. https://doi.org/10.1016/j.matdes.2022.110900
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Publisher DOI: 
10.1016/j.matdes.2022.110900
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Publication Type: 
Article - Original Research Article
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Language: 
English
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Authors: 
Unnikrishnan, Rahul 
Gardy, Dr Jabbar 
Spencer, Ben 
Kurinjimala, Robin 
Dey, Avishek 
Nekouie, Vahid 
Irukuvarghula, Sandeep 
Hassanpour, Ali 
Eisenmenger-Sittner, Christoph 
Francis, John A. 
Preuss, Michael 
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Organisational Unit: 
E138-03 - Forschungsbereich Functional and Magnetic Materials 
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Journal: 
Materials & Design 
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ISSN: 
0264-1275
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Date (published): 
2-Jul-2022
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Publisher: 
ELSEVIER SCI LTD
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Peer reviewed: 
Yes
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Keywords: 
Flowability of powder; Functionalization of powder; Oxidation protection; SA508 grade 3 steel; Surface modification
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Abstract: 
The oxidation state and surface properties of powder particles play a major role in the final properties of powder manufactured components. In the present study, the coating of a non-stainless low alloy (SA508 Grade 3) steel powder was explored to protect it from progressive oxidation while also studying the effects on powder flowability and electrical charging. The protective coating was applied by magnetron sputtering of chromium. The surface chemistries of both as-received and Cr coated powders were studied using X-ray photo electron spectroscopy (XPS). Accelerated oxidation tests were carried out on both uncoated and Cr coated powders to study the effects of coating on oxidation resistance. Hard X-ray photoelectron spectroscopy (HAXPES) analysis was used to measure oxygen pick up near the surface, showing significant reductions for the case of the Cr coated powder. The conductivity of the powder was found to increase with Cr coating. The flowability of the powder was characterised by the tapped density, the angle of repose (AOR) and a powder rheometer, and it was found to improve with a Cr coating, which can be attributed to reduced tribo-electrical charging and reduced cohesivity of the powder particles.
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Project (external): 
MAPP: EPSRC Future Manufacturing Hub
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Research Areas: 
Materials Characterization: 40%
Surfaces and Interfaces: 40%
Composite Materials: 20%
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Science Branch: 
1030 - Physik, Astronomie: 100%
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