PENGARUH PENAMBAHAN SERABUT KELAPA PADA MATERIAL MAGNET FILLER KOMPOSIT BaFe₁₂O₁₉/KARBON AKTIF MELALUI METODE MECHANICAL MILLING UNTUK APLIKASI PENYERAP GELOMBANG RADAR

NAUFAL NAFIS, . (2025) PENGARUH PENAMBAHAN SERABUT KELAPA PADA MATERIAL MAGNET FILLER KOMPOSIT BaFe₁₂O₁₉/KARBON AKTIF MELALUI METODE MECHANICAL MILLING UNTUK APLIKASI PENYERAP GELOMBANG RADAR. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.

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Abstract

BaFe₁₂O₁₉ merupakan bahan yang sering digunakan dalam aplikasi penyerapan gelombang radar. Penambahan Karbon Aktif juga dinilai dapat menciptakan material komposit yang memiliki penyerapan lebih baik. Selain itu, penambahan Serabut Kelapa sebagai matriks dan dikombinasikan dengan filler berpotensi menghasilkan suatu material peyerap gelombang radar yang optimal. Metode yang digunakan adalah mechanical milling dengan variasi komposisi filler BaFe₁₂O₁₉/Karbon Aktif (x = 0; 5; 10; 15) serta variasi material magnet filler komposit Serabut Kelapa + BaFe₁₂O₁₉/Karbon Aktif (x = 100; 90; 80; 70; 60). Karakterisasi dilakukan menggunakan permagraph untuk sifat magnetik dan Vector Network Analyzer (VNA) untuk sifat penyerapan gelombang mikro pada frekuensi X-band. Pengujian sifat magnetik sampel filler menunjukkan penurunan pada Magnetisasi Remanansi (Mr), Magnetisasi Saturasi (Ms), dan medan Koersivitas (Hc). Nilai koersivitas yang besar menunjukkan material termasuk hard magnetic. Hasil VNA menunjukkan sampel filler BaFe₁₂O₁₉ murni (x=0) paling optimal dengan nilai RL minimum -15,52 dB pada frekuensi 11,45 GHz dan efisiensi penyerapan maksimum Am+T mencapai 97,20%, sedangkan untuk sampel filler komposit paling optimal adalah variasi kode D; x=60 dengan nilai RL minimum sebesar -31.8132 dB pada frekuensi 12.6138 GHz dan efisiensi penyerapan maksimum Am+T mencapai 99.93%. ************************************************************ BaFe₁₂O₁₉ is a material that is frequently used in radar wave absorption applications. The addition of Activated Carbon is also considered capable of creating a composite material with improved absorption properties. Furthermore, the incorporation of Coconut Fiber as a matrix combined with fillers has the potential to produce an optimal radar-absorbing material. The method used in this study was mechanical milling with variations in the BaFe₁₂O₁₉/Activated Carbon filler composition (x = 0; 5; 10; 15) as well as variations in the composite filler material consisting of Coconut Fiber + BaFe₁₂O₁₉/Activated Carbon (x = 100; 90; 80; 70; 60). Characterizations were conducted using a permagraph to determine magnetic properties and a Vector Network Analyzer (VNA) to measure microwave absorption properties within the X-band frequency range. Magnetic property testing of the filler samples showed a decrease in Remanent Magnetization (Mr), Saturation Magnetization (Ms), and Coercivity (Hc). The relatively high coercivity values indicate that the material is classified as hard magnetic. The VNA results showed that the pure BaFe₁₂O₁₉ filler sample (x=0) exhibited the most optimal absorption with a minimum RL value of -15.52 dB at a frequency of 11.45 GHz and a maximum absorption efficiency (Am+T) reaching 97.20%. Meanwhile, for the composite filler samples, the most optimal variation was sample code D; x=60, which exhibited a minimum RL value of -31.8132 dB at a frequency of 12.6138 GHz and a maximum absorption efficiency (Am+T) reaching 99.93%.

Item Type:	Thesis (Sarjana)
Additional Information:	1). Prof. Dr. Erfan Handoko, M.Si. 2). Prof. Dr. Mangasi Alion Marpaung, M.Si.
Subjects:	Sains > Fisika
Divisions:	FMIPA > S1 Fisika
Depositing User:	Naufal Nafis .
Date Deposited:	15 Aug 2025 06:08
Last Modified:	15 Aug 2025 06:08
URI:	http://repository.unj.ac.id/id/eprint/61177

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