FeSiAl/metal core shell hybrid composite with high-performance electromagnetic interference shielding

• Published in: Composites science and technology Vol. 172; pp. 66 - 73
• Main Authors: Sambyal, Pradeep, Noh, Seok Jin, Hong, Jun Pyo, Kim, Woo Nyon, Iqbal, Aamir, Hwang, Seung Sang, Hong, Soon Man, Koo, Chong Min
• Format: Journal Article
• Language: English
• Published: Barking Elsevier Ltd 01-03-2019; Elsevier BV
• Subjects: Absorption; Composite materials; Conduction losses; Copper; Core-shell; Dendritic structure; Dielectric loss; Dielectric properties; Electrical conductivity; Electrical resistivity; Electroless plating; Electromagnetic shielding; Electromagnetism; EMI shielding; Hybrid composites; Magnetic cores; Magnetic fields; Magnetic properties; Magnetic shielding; Metal shells; Nanoparticles; Nickel plating; Paraffin wax; Sendust; Silver plating; Sendust; Electrical conductivity; Core-shell; Electroless plating; EMI shielding
• ISSN: 0266-3538; 1879-1050
• DOI: 10.1016/j.compscitech.2019.01.007

Herein, for the first time, FeSiAl (sendust)/metal hybrid materials were synthesized with a magnetic core and a highly electrically conductive metal shell for shielding electromagnetic interference (EMI) pollution. Soft magnetic sendust flakes were electroless-plated with electrically conductive Ag or Ni metal to form Ag-plated and Ni-plated sendust core-shell hybrids. The magnetic and metal hybrid-incorporated paraffin wax composites exhibited a better absorption-dominant EMI shielding performance of 65.6 dB and 58.5 dB, respectively, than that of the sendust wax composite and the composite with a mixture of sendust and electrically conductive Ag/Cu dendrite. The superior shielding performance was attributed to the synergistic combination of the effective magnetic loss, dielectric loss, and conduction loss. These exceptional properties of the new hybrid composite showed that it could be used in absorption-dominant EMI shielding applications.