利用赤泥制备FexOy/BaTiO3/C复合材料及其吸波性能研究OA

To achieve the resource utilization of red mud,this work prepares FexOy/BaTiO3/C composite microwave absorbing materials using red mud as the iron source and soluble starch as the carbon source,employing sol-gel and solid-state reaction methods.First,a BaTiO3 precursor sol is obtained through the sol-gel process using titanium butoxide and barium acetate,which is then mixed uniformly with red mud and soluble starch.During the solid-state reaction,Fe2O3 in the red mud undergoes in situ carbothermic reduction to form Fe3O4 and Fe,which are evenly distributed within the composite,and the BaTiO3 exhibits a needle-like morphology.Experimental results show that by adjusting the solid-state reaction temperature and the raw material ratio,the phase composition,microstructure,and microwave absorption performance of the composites can be optimized.When the temperature is 700 ℃,RmBTS-700-1.2 exhibits a minimum reflection loss of-16.0 dB at a coating thickness of 2.0 mm,with an effective absorption bandwidth of 3.0 GHz.Meanwhile,RmBTS-700-1.8 achieves a minimum reflection loss of-32.6 dB at 10.7 GHz under the same coating thickness.The FexOJBaTiO3/C composite microwave absorbing materials prepared in this study exhibit both strong dielectric loss and magnetic loss capabilities,providing a new approach for the comprehensive utilization of red mud and contributing to the realization of the carbon neutrality and carbon peak goals.