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The Optimization of L-PBF Process for Economical & High Performance Using SiO2 Nanoparticle-Coated Non-Spherical Ti Powder KCI 등재
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/449266
pp.22-36
In laser powder bed fusion (L-PBF), a metal powder–based additive manufacturing process, pure titanium powders rely on expensive gas-atomized spherical powders, which poses a significant limitation of material cost. In contrast, non-spherical titanium powders are more cost-effective but their application in L-PBF is restricted their use due to poor flow property and high oxygen content. In this study, a powder mixing strategy with spherical titanium and hydrophobic SiO2 nanoparticle is proposed to improve the flowability and process stability of non-spherical Ti powders. After evaluating flow properties at various mixing ratios, a spherical-to-non-spherical Ti ratio of 4:6 was selected, with SiO2 nanoparticles added during mixing. The uniform distribution of oxide nanoparticles on the powder surfaces was confirmed by SEM and EDS. A maximum relative density of 99.7% was shown by specimens made with L-PBF under various processing parameters. The specimens obtained a tensile strength of 762.6 ± 3.8 MPa and an elongation of 22.1 ± 0.7% at a volumetric energy density of 71.4 J/mm³. This study demonstrates the application of low-cost non-spherical Ti powders in L-PBF is feasible and presents an effective way to simultaneously increase process stability and economic efficiency in titanium additive manufacturing.
2. Materials and Methods
2.1 Powder preparation
2.1 Flow properties characterization
2.3 L-PBF process parameter optimization
2.4 Phase & Nitrogen/Oxygen content analysis
2.5 Tensile properties
2.6 Microstructure
3. Results and Discussion
3.1 Powder preparation & flowability
3.2 Relative density
3.3 Tensile test
3.4 Microstructure (EBSD analysis)
4. Conclusion
Funding
Conflict of Interest
Data Availability Statement
Author Information and Contribution
Acknowledgments
References
