In-Situ Reduction of Mo-Based Composite Particles during Laser Powder Bed Fusion
Raw powders are processed in water during the freeze-dry pulsated orifice ejection method (FD-POEM), leading to the inclusion of oxygen impurities. This study proposes a strategy for removing the oxygen content and enhancing the mechanical performance of laser powder bed fusion (L-PBF) builds from p...
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MDPI AG
2021-06-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/11/6/702 |
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| author | Suxia Guo Weiwei Zhou Zhenxing Zhou Yuchi Fan Wei Luo Naoyuki Nomura |
| author_facet | Suxia Guo Weiwei Zhou Zhenxing Zhou Yuchi Fan Wei Luo Naoyuki Nomura |
| author_sort | Suxia Guo |
| collection | DOAJ |
| description | Raw powders are processed in water during the freeze-dry pulsated orifice ejection method (FD-POEM), leading to the inclusion of oxygen impurities. This study proposes a strategy for removing the oxygen content and enhancing the mechanical performance of laser powder bed fusion (L-PBF) builds from powders using carbon nanotubes (CNTs) and H<sub>2</sub> reduction. Spherical 1.5 wt.% CNT/Mo composite powders with uniform dispersion were fabricated via FD-POEM. The quantity of MoO<sub>2</sub> decreased significantly, and a hexagonally structured Mo<sub>2</sub>C phase was simultaneously formed in the L-PBF build. The Mo<sub>2</sub>C with network structure was distributed along the boundaries of equiaxed Mo grains, leading to an increased Vickers hardness of the matrix. This study demonstrates the feasibility of fabricating oxygen-free and high-strength refractory parts during L-PBF for ultrahigh-temperature applications. |
| first_indexed | 2024-03-10T10:17:02Z |
| format | Article |
| id | doaj.art-e6866e3a03304f06946f2f56c0c5fe8e |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T10:17:02Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-e6866e3a03304f06946f2f56c0c5fe8e2023-11-22T00:44:32ZengMDPI AGCrystals2073-43522021-06-0111670210.3390/cryst11060702In-Situ Reduction of Mo-Based Composite Particles during Laser Powder Bed FusionSuxia Guo0Weiwei Zhou1Zhenxing Zhou2Yuchi Fan3Wei Luo4Naoyuki Nomura5Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, JapanDepartment of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, JapanDepartment of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, JapanState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, Donghua University, Shanghai 201620, ChinaState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, Donghua University, Shanghai 201620, ChinaDepartment of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, JapanRaw powders are processed in water during the freeze-dry pulsated orifice ejection method (FD-POEM), leading to the inclusion of oxygen impurities. This study proposes a strategy for removing the oxygen content and enhancing the mechanical performance of laser powder bed fusion (L-PBF) builds from powders using carbon nanotubes (CNTs) and H<sub>2</sub> reduction. Spherical 1.5 wt.% CNT/Mo composite powders with uniform dispersion were fabricated via FD-POEM. The quantity of MoO<sub>2</sub> decreased significantly, and a hexagonally structured Mo<sub>2</sub>C phase was simultaneously formed in the L-PBF build. The Mo<sub>2</sub>C with network structure was distributed along the boundaries of equiaxed Mo grains, leading to an increased Vickers hardness of the matrix. This study demonstrates the feasibility of fabricating oxygen-free and high-strength refractory parts during L-PBF for ultrahigh-temperature applications.https://www.mdpi.com/2073-4352/11/6/702laser powder bed fusion (L-PBF)freeze-dry pulsated orifice ejection method (FD-POEM)carbon nanotubesmolybdenummicrostructure |
| spellingShingle | Suxia Guo Weiwei Zhou Zhenxing Zhou Yuchi Fan Wei Luo Naoyuki Nomura In-Situ Reduction of Mo-Based Composite Particles during Laser Powder Bed Fusion Crystals laser powder bed fusion (L-PBF) freeze-dry pulsated orifice ejection method (FD-POEM) carbon nanotubes molybdenum microstructure |
| title | In-Situ Reduction of Mo-Based Composite Particles during Laser Powder Bed Fusion |
| title_full | In-Situ Reduction of Mo-Based Composite Particles during Laser Powder Bed Fusion |
| title_fullStr | In-Situ Reduction of Mo-Based Composite Particles during Laser Powder Bed Fusion |
| title_full_unstemmed | In-Situ Reduction of Mo-Based Composite Particles during Laser Powder Bed Fusion |
| title_short | In-Situ Reduction of Mo-Based Composite Particles during Laser Powder Bed Fusion |
| title_sort | in situ reduction of mo based composite particles during laser powder bed fusion |
| topic | laser powder bed fusion (L-PBF) freeze-dry pulsated orifice ejection method (FD-POEM) carbon nanotubes molybdenum microstructure |
| url | https://www.mdpi.com/2073-4352/11/6/702 |
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