Understanding the growth mechanism of SiO2 on the surface of FeSi clusters: an MD and DFT simulation study

Huang, Huaqin; Wang, Rui; Chen, Ran; Li, Mingyang; Hou, Qingyu; Wu, Zhaoyang; Huang, Zengqi

doi:10.1007/s10971-022-05760-w

Cited by 2 publications

(1 citation statement)

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“…This method is costly and requires optimisation and adjustment of the chemical solution and reaction conditions whenever the magnetic powder composition and particle size are changed [24][25][26][27]. In contrast, SiO 2 deposition through physical or chemical vapour deposition can be optimised to achieve a high quality of SiO 2 coating on the magnetic powder surface [13,[28][29][30][31]. In previous studies, the author's research group demonstrated that adding fluidisation to the traditional vapour deposition process maintains the magnetic powder in a fluidisation suspension; moreover, the vapour-phase SiO 2 medium will nucleate and grow uniformly on the ferromagnetic powder surface.…”

Section: Introductionmentioning

confidence: 99%

Effect of SiO2/Organosilicone Double Insulation Coating Processes on the Properties of Ferrosilicon Magnetic Cores

Lin,

Zhou,

Jin

et al. 2023

Magnetochemistry

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A nano-SiO2 inorganic insulation layer was coated on the surface of FeSi magnetic powder via in situ fluidised vapour deposition. The surface was then coated with organosilicon resin to form an inorganic/organic double-insulating layer. Post-forming and annealing, a ferrosilicon magnetic powder core was prepared. The effects of organosilicon resin content and pressing pressure on the permeability and loss of the ferrosilicon magnetic core were studied. When the ferrosilicon magnetic core was doubly insulated with SiO2/silicone resin, the silicone resin content increased, the insulation coating gradually thickens, and the saturation magnetic-induction intensity of the magnet gradually decreases; the density and effective permeability showed a trend of increasing first and then decreasing. Increasing the forming pressure can reduce the loss of the core, thereby improving the performance of the core and increasing the permeability without damaging the double-cladding layer. In the powder with the optimised silicone resin content (1.5 wt.%), the magnetic properties of the magnetic core were maximised after preparation at 1500 MPa followed by heat treatment at 773 K. The saturation magnetisation was 187.5 emu/g and the resistivity and permeability reached 10.5 Ω·cm and 49.6, respectively, at 100 mT and 50 kHz. The total loss was 905 mW/cm3.

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