CAJ | 학술논문

以小于250目(58μm)的还原铁粉为原料，直径3 mm的ZrO2球为磨球，采用湿法球磨制得片状还原铁粉；利用扫描电子显微镜、X射线衍射仪和矢量网络分析仪分别表征了球磨前后还原铁粉的形貌、物相结构和其在2~18 GHz 的电磁参数，并运用传输线理论模拟了其反射率(RL)。结果表明：球磨后的还原铁粉呈片状，片厚度为100~200 nm；与球磨前样品相比，球磨后样品的ε′和μ′增大约2倍，ε″增大7~10倍，μ″增大2~4倍；相应2 mm厚的涂层在8.12 GHz有最小RL=–60 dB，RL＜–10 dB的带宽为9.48 GHz (5.12~14.60 GHz)。
이소우250목(58μm)적환원철분위원료，직경3 mm적ZrO2구위마구，채용습법구마제득편상환원철분；이용소묘전자현미경、X사선연사의화시량망락분석의분별표정료구마전후환원철분적형모、물상결구화기재2~18 GHz 적전자삼수，병운용전수선이론모의료기반사솔(RL)。결과표명：구마후적환원철분정편상，편후도위100~200 nm；여구마전양품상비，구마후양품적ε′화μ′증대약2배，ε″증대7~10배，μ″증대2~4배；상응2 mm후적도층재8.12 GHz유최소RL=–60 dB，RL＜–10 dB적대관위9.48 GHz (5.12~14.60 GHz)。
Flaky reduced iron powders were prepared by wet ball milling method using reduced iron powders as raw material (less than 250 mesh, 58μm) and ZrO2 balls as grinding balls (3 mm in diameter). The morphologies, phases and electromagnetic parameters (2–18 GHz) of reduced iron powders before and after ball milling were characterized by scanning electron microscopy, X-ray diffraction and vector network analyzer, and their reflectivity (RL) were calculated using transmission line theory. The results show that the reduced iron powders after ball milling are flaky with thickness of 100–200 nm. Theε′andμ′of reduced iron powders are increased by twice after ball milling, and theε″andμ″are increased by 7–10 and 2–4 times, respectively. The corresponding coating with a thickness of 2 mm obtained a minimum RL of–60 dB at 8.12 GHz and a bandwidth of 9.48 GHz (5.12–14.60 GHz) while RL<–10 dB.