Thermal Plasma Synthesis of Different Alloys and Intermetallics from Ball Milled Al-Mo and Al-Ni Powder Systems
Abstract
:1. Introduction
2. Materials, Machines Used, and Characterization Methods
2.1. Characterization of the Initial Powders
2.2. Mechanical Agglomeration of the Powders and Characteristics of the Plasma Spraying Machine
2.3. Separation of the Obtained Powder Particles
2.4. Characterization of the Obtained Powder Particles
3. Results and Discussion
3.1. Characterization of the Initial Powders
3.2. Mechanical Agglomeration of the Powders
3.3. Plasma Deposition Results
4. Conclusions
- The variation of 3 h of milling time was found to be the optimum time to agglomerate and form non-alloyed Al-Ni and Al-Mo powder systems having a homogeneous distribution of elements in their particles.
- The injection of each of these composite powders into the plasma system resulted in the formation of different phases in the obtained particles. Different phases such as Al, AlNi3, Al3Ni2, and AlNi were detected in the particles of the Al-Ni powder system, and Al, Mo, AlMo3, MoO3, and MoO2 in the Al-Mo powder system
- The powders collected from the reactor wall consisted of large particles being covered within a cloud of very fine particles. The fine particles are thought to be condensed from the vapor phase and the reacted large particles were mostly seen to have Al spots on their surfaces. This shows the diffusion of molten Al into the molten Mo or Ni and was interpreted as a sign of immiscibility of Al into these molten elements
- Particles appearing similar to their initial agglomerated non-treated condition, being absent in the Al-Ni particles, were also seen amongst the large particles of the Al-Mo powder system. This indicates that the level of reaction between Al and Mo was less than that of Al and Ni during the plasma processes.
- It was noted that using a mixture of He and Ar gases, instead of solely using the Ar gas, could prevent the formation of oxides in the Al-Mo plasma treated powder system.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
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Powder | O (wt.%) | C (wt.%) |
---|---|---|
Al | 0.05 | 0.06 |
Mo | 0.003 | 0.002 |
Ni | 0.04 | 0.05 |
Sheath Gas (L/min) | Central Gas (L/min) | Carrier Gas (L/min) | Pressure (Torr) | Power (kW) |
---|---|---|---|---|
80 | 25 | 6 | 300 | 20 |
Sheath Gas (L/min) | Central Gas (L/min) | Carrier Gas (L/min) | Pressure (Torr) | Power (kW) |
---|---|---|---|---|
80 | 25 | 6 | 300 | 10 |
Sheath Gas (L/min) | Central Gas (L/min) | Carrier Gas (L/min) | Pressure (Torr) | Power (kW) |
---|---|---|---|---|
Ar: 15-He: 100 | Ar: 25 | He: 3 | 300 | 10 |
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Khanlari, K.; Achouri, I.E.; Gitzhofer, F. Thermal Plasma Synthesis of Different Alloys and Intermetallics from Ball Milled Al-Mo and Al-Ni Powder Systems. Materials 2022, 15, 8646. https://doi.org/10.3390/ma15238646
Khanlari K, Achouri IE, Gitzhofer F. Thermal Plasma Synthesis of Different Alloys and Intermetallics from Ball Milled Al-Mo and Al-Ni Powder Systems. Materials. 2022; 15(23):8646. https://doi.org/10.3390/ma15238646
Chicago/Turabian StyleKhanlari, Khashayar, Inès Esma Achouri, and Francois Gitzhofer. 2022. "Thermal Plasma Synthesis of Different Alloys and Intermetallics from Ball Milled Al-Mo and Al-Ni Powder Systems" Materials 15, no. 23: 8646. https://doi.org/10.3390/ma15238646