目的 开发一种防腐性和吸波性能均良好的新型复合材料。方法 制备了一种新型的双层吸波复合材料，其中匹配层使用30%(质量分数)稀土铁氧体粉的Ce-铁氧体/TPU复合材料，吸收层则使用70%(质量分数)稀土铁氧体粉的Ce-铁氧体/TPU复合材料。在制备过程中，首先将稀土铁氧体粉和TPU树脂按照一定的比例混合，并通过机械搅拌使其均匀分散。然后，将混合物填充在模具中，并进行高温热压处理，以实现复合材料的固化和成型。结果 通过数值计算，发现双层吸收体的微波吸收性能比其组分有很大的提高。与此同时，在总厚度保持不变的条件下，充分利用30%~70%的层厚度比例进行调节以改善有效吸收带宽的情况，并基于RL(反射损耗)优化了厚度3.5 mm/1.5 mm的30%~70%双分子层。当频率为15.76 GHz时，最大RL峰为?26.4 dB，有效吸收带宽达12.32 GHz(5.68~18 GHz)。通过适当的阻抗匹配和多种损耗形式，可以显著提高30%~70%双层吸收体的微波吸收性能。结论 将30%(质量分数)稀土铁氧体粉的Ce-铁氧体/TPU复合材料和70%(质量分数)稀土铁氧体粉的Ce-铁氧体/TPU复合材料组合形成双层后，其电磁性能明显上升，达到了良好的阻抗匹配。其中30%(质量分数)稀土铁氧体粉的Ce-铁氧体/TPU复合材料的耐腐蚀性能略高于70%(质量分数)稀土铁氧体粉的Ce-铁氧体/TPU复合材料的，将二者组合后，其防腐性能也有所提升，由此制得的双层材料的耐腐蚀性和吸波性能均得到了提升。

Microwave absorbers are susceptible to strong corrosion in the marine environment, leading to significant limitations in their application. Therefore, the development of composites with stronger corrosion resistance and wave-absorbing properties is imminent. The work aims to prepare new double-layer wave-absorbing composites by Ce-ferrite/TPU composites with a 30% mass fraction of rare-earth ferrite powder as the matching layer and Ce-ferrite/TPU composites with a 70% mass fraction of rare-earth ferrite powder as the wave-absorbing layer. Among them, the preparation process of the single-layer composites is to keep the total mass of the rare-earth-doped ferrite powder and polyurethane unchanged at 12 g. The rare earth-doped ferrite powder with mass fractions of 30% and 70% was weighed, respectively, and a three-necked flask was erected. Firstly, the DMF solution was poured in and the stirring paddles were opened to raise the temperature to 80 ℃, and then the DMF solution was poured in the polyurethane (TPU), so that the DMF solution and the polyurethane (TPU), which had been previously heated to 80 ℃, were mixed in the stirring paddles. The DMF solution was fully dissolved under the stirring of the paddles for about two hours, after which the weighed rare earth-doped ferrite powder was poured in to fully react with TPU, and then the above reaction system was placed in a vacuum drying oven for the removal of bubbles and then put into the oven to dry the DMF solution, and a single-layer Ce-ferrite/TPU composite material could be obtained after the above operation.