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对不同地质产状类型天然铁氧体的电磁参数测量结果发现,岩浆岩型(A型)天然铁氧体的电磁参数明显区别于其他类型铁氧体,是一种可用于微波吸收材料的天然矿物.该矿物经选矿工艺制备后,在8~12GHz频率范围内,ε′=58.60,ε″=10.0,μ′=1.2~1.5,μ″=1.0~1.2,属于具有一定磁导率、低介电常数、高电磁损耗的磁性物质,其粉体适合作为吸波材料的磁性吸收剂.对A型天然铁氧体的矿物组成和化学成分的分析结果表明,与单一磁铁矿或二元型铁矿物组成的天然铁氧体相比,A型天然铁氧体中的杂质元素和另相矿物含量明显高于其他天然铁氧体,其中的杂质成分对电磁参数起着重要的调控作用,这种调控作用有利于降低吸波材料的反射系数,并提高电磁波吸收效率.而且,A型铁氧体中的这种天然掺杂导致的结构缺陷及其对电磁参数的影响效应是人工制备的铁氧体难以实现的.材料应用试验与吸波性能测量结果表明,以A型天然铁氧体作为粉体填料与天然橡胶制成的吸波片材在8~12GHz频率范围内的电磁波吸收频宽和反射系数均优于传统的羰基铁粉与橡胶制成的吸波片材,完全可以替代羰基铁粉应用于微波吸收材料的开发,而且具有原料丰富、制备工艺简单、成本低、吸波性能稳定的比较优势.
The electromagnetic parameters of natural ferrite with different geologic production types were measured. It was found that the electromagnetic parameters of natural ferrite of magmatic rock type (A type) were obviously different from those of other types of ferrite. It is a kind of natural The minerals are prepared by the ore beneficiation process, and have the properties of a certain magnetic permeability, a low permeability, a high permeability and a low permeability in the frequency range of 8-12 GHz, with ε ’= 58.60, ε “= 10.0, μ’ = 1.2-1.5, and μ” Dielectric constant, high magnetic loss of magnetic material, the powder is suitable as a magnetic absorbent absorbing material.A type of natural ferrite mineral composition and chemical composition analysis results show that with a single magnetite or binary Compared with natural ferrite composed of Fe-type iron minerals, the content of impurity elements and other phase minerals in type A natural ferrite is obviously higher than that of other natural ferrites, and the impurity components therein play an important regulatory role on the electromagnetic parameters , Which is conducive to reducing the reflection coefficient of the absorbing material and improving the absorption efficiency of the electromagnetic wave Moreover, the structural defects caused by this natural doping in the A-type ferrite and its effect on the electromagnetic parameters are artificially prepared The ferrite is hard to come by The results of test and microwave absorbing performance show that the absorption band width and the reflection coefficient of the electromagnetic wave in the frequency range of 8 ~ 12GHz are better than the traditional absorbing sheets made of natural ferrite type A powder filler and natural rubber Of carbonyl iron powder and rubber wave absorbing sheet can completely replace the carbonyl iron powder used in the development of microwave absorbing materials, and has the advantages of abundant raw materials, simple preparation process, low cost and stable absorbing properties.