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采用球磨工艺,仅通过控制液固比λ得到不同形貌和结构的铁粒子.研究了λ对铁粒子的形貌、结构、电导率、微波电磁和吸收特性的影响规律.结果表明,随λ在0～0.25范围内增大,球磨过程中的焊合和微锻作用分别减弱和增强,导致铁粒子的高活性原子面和形状各向异性分别减小和增大.这使铁粒子的电导率在88.50～2.25 S.cm·1范围内非线性降低,而电磁参数呈规律性变化.其中,湿磨(λ=0.08～0.25)得到的片状铁粒子具有比干磨(λ=0)获得的不规则铁粒子更低的电导率、更高的介电常数、磁导率和吸波性能.这主要得益于片状结构产生的介电驰豫损耗、交换能和电导损耗的协同作用.这表明通过改变λ能有效地调控产物的结构形貌、电导率、微波电磁和吸收特性.
The effects of λ on the morphology, structure, electrical conductivity, microwave electromagnetic and absorption properties of iron particles were studied by ball milling process only by controlling the liquid-solid ratio λ.The results show that with λ Increases in the range of 0 to 0.25, and the welding and micro-forging during ball milling decrease and increase, respectively, resulting in the decrease and increase of the highly active atomic plane and shape anisotropy of the iron particles, respectively. The rate of nonlinear decrease in the range of 88.50 ~ 2.25 S.cm · 1, while the electromagnetic parameters showed regular changes.While the wet grinding (λ = 0.08 ~ 0.25) obtained flaky iron particles than dry grinding (λ = 0) The obtained irregular iron particles have lower conductivity, higher dielectric constant, permeability and wave absorption performance, mainly due to the synergistic effect of the dielectric relaxation loss, exchange energy and conductance loss caused by the sheet structure This shows that by changing the λ can effectively control the product structure, conductivity, microwave electromagnetic and absorption characteristics.