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Functionalization of metallic powder for performance enhancement

Unnikrishnan, Rahul; Gardy, Jabbar; Spencer, Ben F; Kurinjimala, Robin; Dey, Avishek; Nekouie, Vahid; Irukuvarghula, Sandeep; ... Preuss, Michael; + view all (2022) Functionalization of metallic powder for performance enhancement. Materials & Design , 221 , Article 110900. 10.1016/j.matdes.2022.110900. Green open access

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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.

Type: Article
Title: Functionalization of metallic powder for performance enhancement
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.matdes.2022.110900
Publisher version: https://doi.org/10.1016/j.matdes.2022.110900
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Science & Technology, Technology, Materials Science, Multidisciplinary, Materials Science, Flowability of powder, Functionalization of powder, Oxidation protection, SA508 grade 3 steel, Surface modification, STEEL, FILMS, FLOWABILITY, TOUGHNESS, OXIDATION, TARGET
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10176187
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