Development of Electroless Ni-P/NRAM Nanocomposite Powder with Enhanced Microwave Absorption Properties

摘要

Nano radar absorbing material (NRAM) i.e. BaMe{sub}2Fe{sub}16O{sub}27 (Me{sup}(2+)=Fe{sup}(2+)) powder (10nm) is coated with amorphous Ni-P nano layer (5-10nm) by using electroless (EL) technology to develop EL Ni-P/NRAM nanocomposite powder. The experimental processes parameters and EL Ni-P bath composition were optimized to obtain the deposition. As-deposited nanocomposite powder was microwave annealed (MWA) with increasing radiation power from 160 to 760watts for 5 minutes. The surface morphology, elemental contents, phase transformation and magnetic properties of NRAM powders were examined under field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM) respectively. Maximum reflection loss (RL) 33.75dB at 15.80GHz for nanocomposite powder MWA at 760watt was obtained the absorption range under -15dB is from 13.76 to 16.77GHz with 2mm thickness layer in Ku Band. Excellent microwave absorption properties due to accurate electromagnetic (EM) match in the nanocomposite microstructure, a strong natural resonance and multipolarization. Such (Ni+Ni{sub}3P)/NRAM nanocomposite powders may be attractive candidates for EM absorption.