Abstract
Electromagnetic interference (EMI) shielding materials with great absorption effectiveness is highly required in certain application field such as stealth technology but is hard to be realized by conventional metallic shielding materials. In this work, a graphene nanosheets (GNSs) reinforced magnesium (Mg) matrix composite was fabricated by spray deposition and subsequent hot-press sintering. The micro-structure, mechanical properties and EMI shielding effectiveness of the GNSs/Mg composites were characterized systematically. The results showed that synergistic strengthening of mechanical properties and EMI shielding performance of the composites was realized. The strengthening mechanisms on the mechanical and EMI shielding performance of the GNSs/Mg composites were analyzed thoroughly. It was found that the incorporated GNSs reinforced the composites mainly by load transfer and thermal expansion mismatch strengthening. Moreover, the propagation path of electromagnetic waves in the composites is extended by the GNSs, and the GNSs induced laminar structure and thus resulting in an increased electromagnetic absorption effectiveness. The obtained results in this work revealed the synergistic strengthening mechanisms by the laminated structure and provided a novel method to fabricate GNSs/Mg composites with superior mechanical and EMI shielding performance.
NSTL