Preparation method of nano-metal-loaded magnetic foam carbon microwave absorbent

The invention belongs to the field of microwave absorbing materials, and particularly relates to a preparation method of a nano-metal loaded magnetic foam carbon microwave absorbent. The method comprises the following steps: (1) preparing gel in which nano metal particles are uniformly dispersed by taking flour as a precursor and adopting a process of combining a sol-gel method and a coprecipitation method; and (2) pyrolyzing the dried gel by adopting a one-step pyrolysis method to prepare the magnetic foam carbon microwave absorbent in which nano metal particles are uniformly loaded. The preparation process is simple, the requirement on equipment is low, the raw materials are economical, and the prepared material is light in weight, developed in pores, uniform in pore size distribution and high in microwave loss. 本发明属于微波吸收材料领域，具体涉及一种负载纳米金属磁性泡沫炭微波吸收剂的制备方法。该方法包括如下步骤：(1)以面粉作为前驱体，采用溶胶凝胶法和共沉淀法相结合工艺，制备内部均匀分散有纳米金属微粒的凝胶；(2)采用一步热解法热解干燥后的凝胶，制备内部均匀负载有纳米金属微粒的磁性泡沫炭微波吸收剂。本发明制备工艺简单，对设备要求低，原材料经济，所制得的材料质量轻，孔隙发达，孔径分布均匀，对微波损耗强