Preparation And Properties of Electroless Cu/Ni Composite Materials Based On Wood

The changes of properties of wood-based Cu-Ni composites were studied via electroless Cu and Ni on wood surface to obtain Cu-Ni multilayer composites with excellent properties. The surface and interface morphology of the composite coatings were investigated via laser confocal microscopy and scanning electron microscope (SEM). The crystal structure was characterized by XRD. The hydrophobic properties of the composite coatings were tested via contact angle meter. The surface conductivity of composites was tested via four-probe. The results showed that the electrical conductivity of wood-based Cu-Ni composites was 2370.76 S/cm. The surface roughness was 9.99 μm and the thickness of uniform coating reached 157 μm via one time electroless Ni deposition and two times electroless Cu deposition. XRD analysis showed that the wood surface was uniformly covered with metal coating. The metal Cu and Ni were closely nested together to form a dense composite layer, and the composite material was light in weight. When the electroless Ni was 55 min, the contact angle could reach 123°, indicating that had best hydrophobicity. The average electromagnetic shielding effectiveness (EMSE) of Cu and Ni wood-based composites can reach 93.8 dB at L band ranging from 0.3×103 to 3.0×103 MHz) with a low thickness (157 μm), verified the multilayer composite materials can block over 99.99% of incident EM waves.