高导热吸波材料的作用机理研究

Study on the Action Mechanism of High Thermal Conductive Wave Absorbing Materials

为解决材料高导热性能与吸波效能之间的矛盾,将不同组分配比的硅橡胶、预处理后的吸波剂(羰基铁粉)和导热填料(Al_(2)O_(3))进行混炼和模压硫化成型,制备出导热吸波材料,并研究了样品的介电常数与磁导率频谱的规律,以及其高导热和电磁波吸收机理。结果表明,制备出的导热吸波材料在8~16 GHz频段范围内具有较好的吸波性能,最高导热系数达到1.75 W/(m·K),较普通吸波材料导热系数提高2倍以上。为解决电子器件散热和电磁干扰问题提出了一种便于操作、行之有效的方法。

To solve the contradiction between the high thermal conductivity and absorption efficiency of materials,the heat-conduction wave-absorption materials were prepared through mixing and moulding curing procedure of silicone rubber,wave-absorption agent and heat-conduction fillers with different component ratio,and studied the laws of the dielectric constant and magnetic permeability spectrum of the sample,as well as the high thermal conductivity and electromagnetic wave absorption mechanism.According to the results,Heatconducting wave-absorbing material performed good wave-absorbing performance in the range of 8~16 GHz,the thermal conductivity of sample with a highest value of 1.75 W/(m·K)raised more than 100%compared with ordinary absorbing material.This work provided a useful and convenient approach to solve heat dissipation and electromagnetic interference problems of electronic devices.