Study on morphological, structural, electrical, and electromagnetic shielding properties of carbon fabric coated with nickel and cobalt by electroplating method

Document Type : Original Article

Authors
1 دانشگاه صنعتی اصفهان، دانشکده مهندسی نساجی
2 Isfahan University of Technology
3 دانشگاه صنعتی اصفهان، پژوهشکده فاوا
Abstract
Carbon fabrics (CFs) were coated using an electroplating method with nickel and cobalt particles that possess electrical and magnetic properties. The nickel-coated carbon fabric (CFs-Ni) and cobalt-coated carbon fabric (CFs-Co) were produced; then, surface structure, elemental analysis, microstructure, color variations, electrical conductivity, magnetic properties, and EMI shielding effectiveness were examined and compared. Surface structure and elemental analysis show that metal particles are deposited on the surfaces of the CFs in both samples. The average particle sizes of nickel and cobalt were calculated to be 86±12 nm and 129±23 nm, respectively. In the CFs-Co sample (Ms = 72.24 emu/g), due to the superior magnetic properties of the cobalt metal mass, the magnetic properties are significantly better than those of the CFs-Ni sample (Ms = 21.87 emu/g). Additionally, other magnetic parameters are higher in the CFs-Co sample due to the larger particle sizes compared to CFs-Ni. The electrical conductivity of the CFs-Ni and CFs-Co samples are 407.12±31.59 S/cm and 310.96±23.19 S/cm, respectively. The average EMI shielding effectiveness for both samples CFs-Ni and CFs-Co were measured to be 67.16±1.64 dB and 56.71±3.41 dB, respectively. The contributions of absorption and reflection of electromagnetic waves for both samples were analyzed. The absorption rates for the CFs-Ni and CFs-Co samples were calculated to be 80.5% and 88.6%, respectively. This study demonstrates that both samples, due to their exceptional electromagnetic wave absorption, can be used as materials for EMI shielding applications, such as in aerospace industries and sensitive electronic components.
Keywords
Subjects

Article Title Persian

مطالعه بر روی خواص مورفولوژیکی، ساختاری، الکتریکی و محافظت الکترومغناطیسی پارچه کربن پوشش داده شده با نیکل و کبالت به روش آبکاری الکتریکی

Authors Persian

حمیدرضا مرادی 1
کمیل نصوری 2
غلامرضا عسکری 3
Abstract Persian

پارچه های کربن (CFs) به روش آبکاری الکتریکی با ذرات نیکل و کبالت که دارای خواص الکتریکی و مغناطیسی هستند، پوشش دهی شدند. پارچه پوشش داده شده با نیکل (CFs-Ni) و پارچه پوشش داده شده با کبالت (CFs-Co) تولید شد؛ سپس آنالیزهای ساختار سطحی، عنصری، ریز ساختار، تغییرات رنگ، هدایت الکتریکی، خواص مغناطیسی و محافظت EMI بررسی و نتایج مقایسه می‌شود. ساختار سطحی و آنالیز عنصری نشان می‌دهد که ذرات فلزی در دو نمونه روی سطوح CFs پوشش داده می‌شوند. میانگین اندازه ذرات نیکل و کبالت به ترتیب برابرnm 86±12 و 129±23 محاسبه شده است. در نمونه CFs-Co (emu/g 72.24 Ms=) با توجه به خواص برتر مغناطیسی توده فلزی کبالت خواص مغناطیسی به طور قابل توجهی برتر از نمونه CFs-Ni (emu/g 21.87 Ms=) هست و همچنین سایر پارامترهای مغناطیسی به علت اندازه ذرات بزرگ‌تر نمونه CFs-Co بیشتر از نمونه CFs-Ni می‌باشد. هدایت الکتریکی نمونه CFs-Ni و CFs-Co به ترتیب برابر 407.12±31.59 S/cmو 310.96±23.19 می باشد. میانگین میزان محافظت EMI هر دو نمونه CFs-Ni و CFs-Co به ترتیب برابرdB 67.16±1.64 و 56.71±3.41 اندازه گیری می شود. سهم جذب و انعکاس الکترومغناطیس دو نمونه مورد بررسی قرار میگیرد. سهم جذب برای نمونه CFs-Ni و CFs-Co به ترتیب برابر 80.5%و 88.6% محاسبه شده است. این پژوهش نشان داد هر دو نمونه با توجه به جذب فوق‌العاده امواج الکترومغناطیس می‌توان به‌عنوان وسیله‌ای برای کاربردهای محافظت EMI به‌عنوان مثال در صنایع هوا - فضا و قطعات الکترونیکی حساس استفاده کرد.

Keywords Persian

پارچه کربن
آبکاری الکتریکی
نیکل
کبالت
محافظت EMI
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