期刊
POWDER METALLURGY
卷 60, 期 3, 页码 198-207出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00325899.2017.1291098
关键词
Atomisation; melt; close-coupled; nozzle design; CuSn; powder; convergent-divergent
资金
- AiF
- BMWi (Gefordert durch: Bundesministerium fur Wirtschaft und Energie aufgrund eines Beschlusses des Deutschen Bundestages
- Frderkennzeichen) [KF2156512LL4]
Additive manufacturing processes such as selective laser melting and electron beam melting require small particle sizes. A widely used technique to produce suitable powders is close-coupled atomisation. To further decrease the achieved particle sizes, the annular geometry of the gas nozzle is changed to a convergent-divergent (CD) profile. This novel configuration is capable of operating stably at low pressures of 0.8 MPa and above. Beyond that, the unwanted effects of lick-back are avoided. Different nozzles with conventional and convergent-divergent annular geometry have been designed based on fluid-flow calculations. The aspiration pressure was measured to determine stable process windows. Powders from a CuSn alloy were produced using cold and hot gas atomisation to show the influence on the process stability, particle size and morphology. High-speed recordings are used to investigate the process conditions of the different nozzle configurations.
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