Papers by Author: He Jing Wen

Abstract: Tungsten (W) micro-/nanoparticles were synthesized by thermally treating tungstate-based inorganic-organic hybrid nanobelts with a lamellar structure or the mixture of WO3 nanoplates and C6H12O6 in an Ar flow at 1000-1200 oC for 2-6 h. Phase compositions and morphologies of the W particles obtained were characterized by powder X-ray diffraction and scanning electron microscope.

Abstract: SiO2-SiC composite particles were prepared using a sol-gel process. BaTiO3 powders were synthesize through solid-state reaction. They were mixed as microwave absorbents with Fe3O4 powders to obtain the complex absorption. Epoxide resin (EP) was used as matrix and solidified with the mixtures. The techniques of DSC-TG, XRD were used to characterize the composite particles and the obtained compacts. A vector network analyzer was used to measure the reflectivity of the SiO2-SiC-based composites. The effects of the aborbents’ contents on the reflection of the microwave absorption materials were disscussed. It was found that SiO2-SiC composites could be prepared using sol-gel process and BaTiO3 powders could be synthesize through solid-state reaction. The results indicated that SiO2-SiC composite is contribute to absorb microwave, where SiO2-SiC: BaTiO3: Fe3O4 = 6:2:2 (vol %), the frequency region in which the maximum reflectivity is more than -10 dB is 5.4-7.6 GHz.