Study of surface modification and infrared-radar stealth performance of La0.7Ba0.3MnO3 powder

In order to further improve the infrared / radar compatible stealth performance of La_0.7Ba_0.3MnO₃ powder. The perovskite type La_0.7Ba_0.3MnO₃ powder were prepared by sol-gel, and its surface was metallized by electroless plating. The phase structure, surface morphology and composition of samples before and after electroless plating were characterized by means of XRD, SEM. IR-2 infrared emissivity tester and vector network analyzer were used to analyze the infrared emission and radar absorbing performance before and after electroless plating. The results show that, the infrared emissivity of the samples in the infrared range of 8~14 μm and 3~5μwas significantly reduced by electroless plating. The infrared emissivity in 8~14 μm decreased from 0.818 to 0.604 after plating, in the 3~5 μm decreased from 0.768 to 0.513, and the reduction rate was about 0.2. The peak of the radar wave absorption of the electroless Ni-P alloy layer is lower than that before plating. The frequency of the maximum absorption peak is shifted from low frequency to 8.2 GHz before plating, The effective absorption bandwidth is from 3 GHz before plating to 4.5 GHz after plating. The surface modification of La_0.7Ba_0.3MnO₃ powder by electroless plating can double the infrared and radar wave stealth performance and provide a new idea for the research of infrared / radar compatible stealth material.