ZnO/FeSiAl导热吸波硅橡胶的制备及其性能OA

In order to achieve good heat dissipation and electromagnetic wave absorption per-formance of the material,ZnO and flake FeSiAl were used as functional fillers,and room tem-perature vulcanized silicone rubber was filled to prepare a thermal conductive absorbing compos-ite material.The microstructure,mechanical properties,thermal conductivity and microwave ab-sorption performance of ZnO/FeSiAl thermally conductive and microwave absorbing silicone rubber were analyzed by X-ray diffraction(XRD),scanning electron microscopy(SEM),univer-sal tensile test,thermal conductivity test and electromagnetic parameter test.The results show that the mixed ZnO and FeSiAl are relatively pure and free of other impurities.When the ratio is 5∶3,the distribution of FeSiAl and ZnO in silicone rubber is the most uniform.In terms of me-chanical properties,the tensile strength decreases while the Shore hardness increases with the in-crease of the ratio.The thermal conductivity reaches the best performance when the ratio increa-ses to 5∶3,with a thermal conductivity of 0.85 W/(m·K).At the same time,under the con-dition of a ratio of 5∶3,the material also shows better microwave absorption performance.When the sample thickness is 2.0 mm,the minimum reflection loss RLmin at 10.87 GHz is-22.45 dB,and the effective absorption bandwidth is 4.1 GHz.In addition,after combining with the periodic frequency selective surface(FSS),the microwave absorption performance is greatly enhanced,and the minimum reflection loss value of-59.92 dB is achieved at 10.73 GHz.This work is helpful to solve the problems of heat conduction and electromagnetic pollu-tion in electronic devices.