Abstract
In this study, sodium reduced tantalum (Ta) powders were processed by fluidization, jet milling and plasma spheroidization respectively to improve processing performance for additive manufacturing (AM). The morphologies, flowability, chemical compositions, and microstructural evolution of as-processed Ta powders were systematically studied. The flowability of raw Ta powder can be significantly improved by both jet milling (JMed) and plasma spheroidization (PSed). The impurities contents of powders in each process did not significantly change. The homogeneous oxide film and bimodal particle size distribution of PSed powder led to a higher laser absorption and wide printing parameters range as compared to JMed powder. The as-printed Ta components exhibited a good part precision and low hardness due to low oxygen content of both JMed and PSed powders.
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