Ag包覆弹性体微球的制备及其电性能

采用置换反应法和化学沉积法制备了微米级镀Ag丙烯酸酯橡胶（ACM）微球，研究了镀Ag导电弹性体微球的电性能。结果表明：置换反应法通过对微球基体先化学镀铜再置换镀Ag，能够得到镀层均匀致密、包覆完善的镀Ag弹性体微球；所制备镀Ag微球的体积电阻率随外加压力及温度的升高，均呈现规律性降低，并且不受热循环的影响，表明所制备的镀Ag导电弹性体微球具有一定的弹性、热膨胀性以及良好的热稳定性。     

高耐蚀锌铁合金电沉积研究

利用电沉积的方法获取含Fe0.4％～0.8％的锌铁耐蚀合金镀层。结果表明:工艺因素对镀层含Fe量影响很大。而镀层中的含Fe量又直接影响镀层的耐蚀性。含Fe0.4％～0.8％的锌铁合金镀层其耐蚀性大大优于普通镀锌层。少量的铁元素可以大大延迟镀层出白锈、出红锈的时间。     

Enhanced electromagnetic-interference shielding effectiveness and mechanical strength of Co-Ni coated aramid-carbon blended fabric

An efficient method was proposed to prepare high-performance conductive Aramid-Carbon Blend Fabrics (ACBF) with cobalt–nickel (Co-Ni) alloy coatings, which is conducive to industrial production. The grid-like substrate composed of aramid and carbon fibers was innovatively used in flexible Electromagnetic Interference (EMI) shielding materials. The natural network structure is advantageous to the uniform deposition of metal particles to the establishment of conductive pathways subsequently in order to improve conductivity. The induction of a synergistic effect from Electromagnetic (EM) wave-reflection and EM wave-absorption through the whole carbon-Co-Ni-ternary system notably enhanced the EMI Shielding Effectiveness (SE) value to an average of 42.57 dB in the range of 30–6000 MHz. On the other hand, together with the inherent toughness of the alloy coatings, the tensile strength of the aramid fibers used for bulletproof made a significant contribution to the desired mechanical properties. The light weight of the resultant composite made it applicable to aerospace vehicles simultaneously. X-ray Photoelectron Spectroscopy (XPS) was conducted to investigate the variations of elements and groups on the sample surface in pre-treating process. The elemental components and surface morphologies of fabric samples during different stages of the process were investigated by Scanning Electron Microscope (SEM) and Energy Dispersive spectrometer (EDX) measurements. X-Ray Diffraction (XRD) results indicated that the obtained Co-Ni alloy coating had a combined Hexagonal Closed-Packed (HCP) and Faced-Centered Cubic (FCC) crystalline phase. The relatively high corrosion resistance demonstrated in different acid and alkaline conditions was instrumental in more complex environments as well.