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Silicon nanopowder synthesis by inductively coupled plasma as anode for high-energy Li-ion batteries
Published in Klaus D. Sattler, Silicon Nanomaterials Sourcebook, 2017
Dominic Leblanc, Richard Dolbec, Abdelbast Guerfi, Jiayin Guo, Pierre Hovington, Maher Boulos, Karim Zaghib
The RF induction plasma is generated through an inductive coupling mechanism. When an alternating current of RF and high voltage are imposed on a spiral coil, the conductor placed in the center of the coil will be heated up under the alternative electromagnetic field. If a continuous gas flow is introduced into the coil, the gas is ionized and heated to form a plasma, allowing the conversion of electrical energy into thermal energy. The plasma is called an inductively-coupled plasma (ICP). Figure 20.3 shows the induction plasma generated by RF discharge.
Novel powder processing technologies for production of rare-earth permanent magnets
Published in Science and Technology of Advanced Materials, 2021
Kenta Takagi, Yusuke Hirayama, Shusuke Okada, Wataru Yamaguchi, Kimihiro Ozaki
Currently, Hirayama et al. are developing a new synthesis technique to produce rare-earth magnet nanoparticles using a thermal plasma method. In the thermal plasma method, raw coarse powder is evaporated in an induction plasma flame having a temperature of 10 000 K, as shown in Figure 9 [51,52], after which the metal vapor that emerges from the plasma flame due to the downdraft undergoes a nucleus generation/aggregation process and finally forms nanoparticles. Here, the nanodroplets emitted from the plasma flame solidify under ultra-fast quenching at 105 K/s. Since this cooling rate is close to that of melt-spinning (104 to 106 K/s) [53], metastable phase nanoparticles can also be expected. When producing easily oxidizable rare-earth alloy nanoparticles, it is essential to avoid exposure to even a small amount of oxygen.