Reflection Loss Characteristic as Coating Thickness Function on the Microwave Absorbing Paint at a Frequency of 8-12 GHz

Abstract

The effect of paint thickness based on Ba0.6Sr0.4Fe10MnTiO19 nanoparticles as a microwave absorber has been investigated. Nanoparticle powder Ba0.6Sr0.4Fe10MnTiO19 was made using a solid-state reaction method milled with seven hundred rpm for fifty hours then characterized first. Qualitative and quantitative analysis of structure and phase was measured by using X-ray diffraction (XRD). The sample has a hexagonal structure with a space group P63/mmc, and no other phase is detected. Meanwhile, scanning electron microscopy (SEM) was used for surface morphology analysis. Homogeneous sample granules with an almost round shape with a nanometer scale between seventy to one hundred nanometers. Loop hysteresis obtained from the measurement of vibrating sample magnetometer has a maximum magnetic value of Ms = 50 emu/g, magnetic remanent (Mr) of 32.0 emu/g and coercivity (Hc) of 0.34 T. Next step the nanoparticles were mixed with paint with a weight ratio composition of 30: 70. The mixture was then sprayed with several variations of paint thickness on the iron metal plate. After that, the reflection loss characteristic was measured by using vector network analyzer on a painted plate and resulted that the best performance of microwaves absorption resulted in the sample with two sprays. It was concluded that the paint thickness could affect the ability of reflection loss, but the thicker the paint does not mean that the loss of reflection is getting better.