| 研究課題/領域番号 |
20K15036
|
|---|
| 研究機関 | 東北大学 |
|---|
研究代表者 |
周 偉偉 東北大学, 工学研究科, 助教 (10800352)
|
|---|
| 研究期間 (年度) |
2020-04-01 – 2022-03-31
|
| キーワード | Laser powder bed fusion / Mo-based composites / Coatings / Hetero-agglomeration / Oxidation resistance |
|---|
| 研究実績の概要 |
I have uniformly decorated ceramic nanoparticles on the surface of Mo-based alloy powders using acid-treated carbon nanotubes (CNTs) or nanobubbles as bridging agents during a hetero-agglomeration process.The effect of ceramic contents on the properties of composite powders was investigated. The composite powders possessed homogenous dispersion, good flowability, improved laser absorptivity, suitable particle size and distribution. Moreover, laser powder bed fusion (L-PBF) was performed for the fabrication of Mo-based composite bulks. The microstructure evolution of ceramic reinforcements or metal matrix during L-PBF was studied. Through reducing the scanning speed, a thin ceramic layer was introduced on the top surface of L-PBF composite builds.
|
| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
The objective of this proposal is to simultaneously enhance the mechanical performance and oxidation resistance of Mo-based alloys by L-PBF. This year, the approaches of fabricating uniform ceramic/Mo-based composite powders were successfully developed as scheduled. Moreover, an in-situ protective layer was possibly formed on Mo-based composites by controlling the L-PBF processing of nanoceramic-decorated alloy powders, which is smoother than initially planned.
|
| 今後の研究の推進方策 |
Based on the research plan, the formation mechanism of ceramic coatings during L-PBF will be clarified by single-track experiments and theoretical simulation. The influence of building layers or ceramic concentrations on the ceramic layer formation such as thickness or chemical composition will be studied. Moreover, the room-/high-temperature mechanical property and oxidation resistance are systematically evaluated for confirming the application potential of Mo-based composites.
|
| 次年度使用額が生じた理由 |
For consumables expenses, such as argon gas, polishing materials, microstructure observation cost, and L-PBF consumables. The argon gas is used as protective gas during L-PBF process. The polishing materials like sandpapers, or polishing paste are needed for sample preparation. The TEM, SEM and EBSD are required for microstructural observations. The L-PBF consumables (e.g., brushes, bottles) and Ti substrates are needed for fabricating Mo-based composites.
|
