Search

Fe3Al powders with different order degrees were fabricated by a high-energy ball milling process and ordering transformation process. The order degree of the Fe3Al powders with plate structures can be tuned by the calcination temperature. It is found that the order degree of the obtained Fe3Al powders affects the magnetic properties. When the sample is calcined at 500 °C, the obtained Fe3Al contains the most DO3 superlattice structure with an order degree of 40.2%, thus exhibiting the best magnetic properties. Moreover, the best impedance matching ratio and attenuation constant are also achieved, leading to the best electromagnetic wave absorption performance. When the thickness is 1.35 mm, the effective absorption bandwidth with RL ≤ − 10 dB is as wide as 7.2 GHz. [ABSTRACT FROM AUTHOR]

B4C@CNT nanowires were synthesized on the carbon fiber fabric (CFs) surface to form CFs-B4C-CNT hybrid materials via thermal growth method for improving the microwave absorption performance. The microwave absorption property of the CFs-B4C-CNT hybrid materials were studied in the frequency range of 8.2–12.4 GHz. The results exhibited that B4C@CNT nanowires were decorated on CFs surface successfully. The minimum reflection loss (RLmin) value of 2 wt% CFs-B4C-CNT hybrid material was − 19.7 dB at 8.2 GHz with a layer thickness of 2.9 mm. And the maximum effective absorption bandwidth (RL < − 10 dB) was obtained over the frequency range of 8.4–12.1 GHz with a layer thickness of 2.5 mm. Furthermore, the microwave absorption mechanism of the CFs-B4C-CNT hybrid materials were discussed. This work demonstrated that CFs-B4C-CNT hybrid materials possessed high potential as microwave absorbers with good microwave absorption performance, which provided a new idea for the development of nano-hybrid materials to improve electromagnetic microwave absorption performance. [ABSTRACT FROM AUTHOR]

This paper modified the preparation of SmBO by the conventional solid state method, by using LiCO as flux, to reduce the preparation temperature and improve particle quality. Characterization methods mainly used the X-ray diffraction analysis, scanning electron microscopy, light reflectivity and thermogravimetry-differential scanning calorimetry analysis. The results showed that: the usage of LiCO flux effectively reduced the calcination temperature of the solid state reaction to 600 °C, and it improved the particle properties of SmBO, making particle size more uniform and weakening agglomeration. The materials could absorb 1.06 and 1.54 μm near infrared light simultaneously so it could be used as a composite absorbent. Furthermore, the mechanism of LiCO flux was discussed. [ABSTRACT FROM AUTHOR]