2 research outputs found
Synthesis of Submicron-Sized Spherical Silica-Coated Iron Nickel Particles with Adjustable Shell Thickness via Swirler Connector-Assisted Spray Pyrolysis
Silica-coated iron nickel (FeNi@SiO2) particles
have
attracted significant attention because of their potential applications
in electronic devices. In this work, submicron-sized spherical FeNi@SiO2 particles with precisely controllable shell thickness were
successfully synthesized for the first time using a swirler connector-assisted
spray pyrolysis system, comprising a preheater, specific connector,
and main heater. The results indicated that the thickness of the SiO2 shell can be tuned from 3 to 23 nm by adjusting the parameter
conditions (i.e., preheater temperature, SiO2 supplied
amount). Furthermore, our fabrication method consistently yielded
a high coating ratio of more than 94%, indicating an excellent quality
of the synthesized particles. Especially, to gain an in-depth understanding
of the particle formation process of the FeNi@SiO2 particles,
a plausible mechanism was also investigated. These findings highlight
the importance of controlling the preheater and SiO2 supplied
amount to obtain FeNi@SiO2 particles with desirable morphology
and high coating quality
One-Step Aerosol Synthesis of SiO<sub>2</sub>‑Coated FeNi Particles by Using Swirler Connector-Assisted Spray Pyrolysis
Silica-coated soft magnetic particles are essential for
some powder
magnetic cores consisting of primary (coarse particles) and secondary
(fine particles) soft magnetic particles in the advancement of electric
devices. Herein, we report the first investigation on the direct synthesis
of submicron-sized silica-coated FeNi (FeNi@SiO2) particles
as the secondary particle using a connector-assisted spray pyrolysis
route. Provided by computational fluid dynamics calculation in applying
different connector types, i.e., T-shaped and swirler, we found that
the mixing performance between FeNi and HMDSO vapor in the swirler
connector played an important role in resulting heterogeneous nucleation,
which is crucial for obtaining the higher coating ratio (CR) and fewer
undesired nanoparticles than that of the T-shaped connector. The as-prepared
submicron-sized FeNi@SiO2 particles (353 nm) with the highest
CR (95.9%) demonstrated a remarkable DC bias characteristic (Isat) and eddy current loss values on a powder
magnetic core, promising the practical application in manufacturing
soft magnetic components