TY - JOUR
T1 - Functionalization of metallic powder for performance enhancement
AU - Unnikrishnan, Rahul
AU - Gardy, Jabbar
AU - Spencer, Ben F.
AU - Kurinjimala, Robin
AU - Dey, Avishek
AU - Nekouie, Vahid
AU - Irukuvarghula, Sandeep
AU - Hassanpour, Ali
AU - Eisenmenger-Sittner, Christoph
AU - Francis, John A.
AU - Preuss, Michael
N1 - Funding Information:
This work was funded by MAPP: EPSRC Future Manufacturing Hub in Manufacture using Advanced Powder Processes EP/P006566/1. This work was also supported by the Henry Royce Institute for Advanced Materials, funded through EPSRC grants EP/R00661X/1 , EP/S019367/1 , EP/P025021/1 and EP/P025498/1 . Rahul Unnikrishnan would also like to acknowledge EPSRC Grant EP/T016728/1.
Publisher Copyright:
© 2022 The Authors
PY - 2022/9
Y1 - 2022/9
N2 - 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.
AB - 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.
KW - Flowability of powder
KW - Functionalization of powder
KW - Oxidation protection
KW - SA508 grade 3 steel
KW - Surface modification
UR - http://www.scopus.com/inward/record.url?scp=85134330368&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2022.110900
DO - 10.1016/j.matdes.2022.110900
M3 - Article
AN - SCOPUS:85134330368
SN - 0264-1275
VL - 221
JO - Materials & Design
JF - Materials & Design
M1 - 110900
ER -