Effect of Nickel–Phosphorus and Nickel–Molybdenum Coatings on Electrical Ablation of Small Electromagnetic Rails
Abstract
:1. Introduction
2. Experimental Equipment and Planning
2.1. Preparation of Small Electromagnetic Catapult Experiment Equipment
2.2. Deposition Process of Nickel–Phosphorus and Nickel–Molybdenum Coatings
2.3. Characterization of Rails
3. Results and Discussion
3.1. Rail Material/Coating Properties
3.2. Influencing Factors of Muzzle Velocity of Armature
3.3. Wear Analysis of the Rail’s Surface
3.4. Analysis of Surface Morphology, Elements and Structure of the Electrical Ablation Zone
4. Conclusions
- The hardness of these five tested materials is 215, 512, 650, 720 and 1045 HV for iron, nickel–phosphorus, annealed nickel–phosphorus, nickel–molybdenum, and annealed nickel–molybdenum, respectively. Heat treatment increases the hardness of the Ni–P and Ni–Mo coatings significantly, which can be ascribed to the precipitation of intermetallic compounds such as Ni3P precipitation for Ni–P and Ni4Mo precipitation for Ni–Mo coating.
- The contact resistance of the five rail-type materials is slightly higher than 0.2 Ω except for the annealed nickel–phosphorus-coated rail (0.186 Ω). However, its impact on the armature catapult velocity is not as obvious as the surface roughness of the rail. The sliding velocity of the armature decreases slightly with the increase in the surface roughness of the rail.
- During the catapult process, discontinuous and rapid electrical ablation on the rail surface was observed. The ratio of ablated area to the total area of these rails is: iron rail (19.5%) > Ni–P-coated rail (12.9%) > annealed Ni–P-coated rail (11.6%) > Ni–Mo-coated rail (4.9%) > annealed Ni–Mo-coated rail (1.1%). Our results show that the hardness of the rail material is an important factor for the resistance of electrical ablation.
- EDS analysis shows that there is more iron in the ablation area of nickel–phosphorus and annealed nickel–phosphorus-coated rails, indicating the iron from the armature material melted and transferred to nickel–phosphorus coating easily. On the contrary, the average value of iron in the ablation zone of annealed nickel–molybdenum coating is relatively small.
- XRD analysis of the ablation zone identifies the presence of Ni3P precipitation for nickel–phosphorus and annealed nickel–phosphorus-coated rails and Ni4Mo phase is observed for nickel–molybdenum and annealed nickel–molybdenum-coated rails. Therefore, it can be deduced that the rail surface of Ni–P and Ni–Mo systems can reach a high temperature that can induce the second phase precipitation. Most of the passing current is used for heating up the rail material and less energy can be used to melt the armature, resulting in a decrease in electrical ablation. Thus, the thermal conductivity should also be an important factor for the rail material to withstand the electrical ablation.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Plating Solution Composition | |
---|---|
Nickel Sulfate Hexahydrate (NiSO46H2O) | 30 g/L |
Sodium Lactate (C3H5NaO3) | 40 mL/L |
Amino Acid Glycine (C2H5NO2) | 10 g/L |
Sodium Hypophosphite (NaPO2H2) | 30 g/L |
Potassium Iodate (KIO3) | 2 mL/L |
Lead Nitrate (PbNO3) | 0.15 mL/L |
Plating Solution Composition | |
---|---|
Nickel Sulfate Hexahydrate (NiSO46H2O) | 52.57 g/L |
Sodium Molybdate dihydrate (MoNa2O4·2H2O) | 9.678 g/L |
Sodium Citrate (Na3C6H507) | 58.82 g/L |
Material | Iron | Ni–P Coating | Ni–P Coating Heat-Treated at 400 °C/1 h | Ni–Mo Coating | Ni–Mo Coating Heat-Treated at 500 °C/1 h | |
---|---|---|---|---|---|---|
Property | ||||||
Hardness (HV) | 215 | 512 | 650 | 720 | 1045 | |
Electrical Resistance (Ω) | 0.224 | 0.21 | 0.186 | 0.226 | 0.230 | |
Surface Roughness (µm) | Ra 1.52 Sa 4.41 | Ra 3.41 Sa 5.01 | Ra 3.88 Sa 5.28 | Ra 4.05 Sa 5.09 | Ra 4.44 Sa 5.39 |
Surface Roughness | Before Catapult | After Catapult | |||
---|---|---|---|---|---|
Rail Type | Ra (µm) | Sa (µm) | Ra (µm) | Sa (µm) | |
Iron rail | 1.52 | 4.41 | 4.49 | 6.59 | |
Ni–P coating rail | 3.41 | 5.00 | 3.97 | 7.31 | |
Ni–P HT. coating rail | 3.88 | 5.28 | 9.55 | 11.6 | |
Ni–Mo coating rail | 4.05 | 5.09 | 6.15 | 7.63 | |
Ni–Mo HT. coating rail | 4.44 | 5.39 | 4.41 | 5.26 |
Result | EDX Analysis (wt.%) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Rail Kind | No. | Fe | C | Co | Cr | Ni | Mn | P | Mo | |
Iron Rail | Spectrum 1 | 95.2 | 2.7 | 1.7 | 0.3 | – | – | – | – | |
Spectrum 2 | 79.6 | 8.1 | 0.4 | 4.4 | 6.6 | 1.0 | – | – | ||
Spectrum 3 | 85.3 | 2.8 | – | 3.8 | 7.0 | 1.1 | – | – | ||
Nickel-Phosphorus Coated Rail | Spectrum 2 | 95.5 | – | – | – | – | – | 4.5 | – | |
Spectrum 3 | 35.9 | – | – | 14.3 | 40.7 | – | 9.0 | – | ||
Annealed Nickel–Phosphorus Coated Rail | Spectrum 2 | 64.2 | 22.3 | – | – | 13.1 | – | 0.4 | – | |
Spectrum 4 | 0.2 | 98.8 | – | 0.1 | 0.9 | – | – | – | ||
Nickel–Molybdenum Coated Rail | Spectrum 2 | – | 10.0 | – | 5.7 | 81.4 | – | – | 2.8 | |
Spectrum 5 | 98.6 | – | – | – | 1.4 | – | – | – | ||
Annealed Nickel–Molybdenum Coated Rail | Spectrum 1 | 45.1 | – | – | 2.9 | 37.0 | – | – | 15.0 | |
Spectrum 2 | 23.7 | 6.4 | – | – | 46.9 | – | – | 23.0 |
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Hsu, L.-S.; Huang, P.-C.; Chou, C.-C.; Hou, K.-H.; Ger, M.-D.; Wang, G.-L. Effect of Nickel–Phosphorus and Nickel–Molybdenum Coatings on Electrical Ablation of Small Electromagnetic Rails. Coatings 2020, 10, 1082. https://doi.org/10.3390/coatings10111082
Hsu L-S, Huang P-C, Chou C-C, Hou K-H, Ger M-D, Wang G-L. Effect of Nickel–Phosphorus and Nickel–Molybdenum Coatings on Electrical Ablation of Small Electromagnetic Rails. Coatings. 2020; 10(11):1082. https://doi.org/10.3390/coatings10111082
Chicago/Turabian StyleHsu, Li-Shan, Pao-Chang Huang, Chih-Cheng Chou, Kung-Hsu Hou, Ming-Der Ger, and Gao-Liang Wang. 2020. "Effect of Nickel–Phosphorus and Nickel–Molybdenum Coatings on Electrical Ablation of Small Electromagnetic Rails" Coatings 10, no. 11: 1082. https://doi.org/10.3390/coatings10111082
APA StyleHsu, L.-S., Huang, P.-C., Chou, C.-C., Hou, K.-H., Ger, M.-D., & Wang, G.-L. (2020). Effect of Nickel–Phosphorus and Nickel–Molybdenum Coatings on Electrical Ablation of Small Electromagnetic Rails. Coatings, 10(11), 1082. https://doi.org/10.3390/coatings10111082