Changes in Metal Powder Surface Chemistry during Powder Bed Fusion Processing:an Overview
Rather high cost of powder for powder bed metal additive manufacturing requires efficient recyclability of the metal powder in order to assure economic feasibility of the process.High surface of the powder,that is about 10 000 times larger than the surface if the bulk material of the same mass,results in significant powder reactivity.Taking into account large processing times during powder bed fusion processing at rather poor atmosphere conditions in the environment surrounding powder surface,powder can undergo rather essential degradation connected to the changes in powder surface chemistry.Such changes are dependent on alloy composition,AM technology in general as well as hardware design specifically.Paper summarizes recent experimental observations and theoretical simulation of the changes in powder surface chemistry during AM processing for a number of different powders.Possibilities of qualitative and quantitative analysis of powder surface chemistry by surface-sensitive chemical analyses using XPS,AES,HR SEM coupled with EDX are shown.Results indicate significant enrichment in the thermodynamically stable surface oxides in case of high-alloyed powders in case of powder bed fusion processes.Generic model of the oxide distribution,depending on the alloy composition,and powder surface degradation during AM manufacturing,is presented.
Powder characterization surface oxide particulate oxide features oxide reduction
Hryha Eduard Gruber Hans Henriksson Mikael Nyborg Lars
Department of Industrial and Materials Science,Chalmers University of Technology,SE-412 96 Gothenburg,Sweden
国际会议
北京
英文
1708-1715
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）