Ichsan, Tubagus Maulana (2022) PENGARUH KETINGGIAN REPLACEMENT TIP, PULSATION, LARUTAN ETCHING, MEDIA SUSPENSI DAN AMPLITUDO TERHADAP NILAI REFLECTION LOSS BARIUM HEXAFERRITE DOPAN Mg-Al. S1 thesis, Fakultas Teknik Universitas Sultan Ageng Tirtayasa.
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Abstract
In the field of defense and security, electromagnetic waves has an important role as one of the systems that can assist in oversight of the security of a territory of the country. Development and knowledge related to radar system technology (radio detection and range) related to the interaction between electromagnetic radiation waves and the material. Material which has the ability to absorb microwaves, one of them is Barium hexaferite (BHF). The material barium hexaferrite is ferromagnetic material that has a high coercivity value, saturation good magnetization and magnetic transition temperature. On barium hexaferrite can use various kinds of nanoparticle synthesis processes, namely methods mechanical alloying, sol-gel, co-precipitation, microemulsion, and others. Various ways can be done, one of which is by adding dopants. The addition of Mg-Al dopant with a certain ratio, can increase the value of lost reflection. In addition, with the sample re-destruction process up to nano size with varying replacement tip heights and on:off pulses of the ultrasonic destruction tool, can affect the value of the reflection loss obtained. Therefore, it is necessary to observe and do research on how influence of ultrasonic destruction with variations in replacement tip height, pulse on:off ultrasonic destruction machine, amplitude, suspension media used, as well as precursor treatment which is carried out in the etching stage first. The samples were carried out in the synthesis stage of ultrasonic destruction with various heights replacement tips (1, 2, 3 and 4 cm), pulse on:off (59:59, 49:49, 39:39, 29:29, 59:49, 59:39 and 59:29), amplitude (35%, 45% and 55%), medium suspension (aquadest, ethanol and ethylene glycol) and the concentration of etching agent HF (5%, 10% and 15%). Fixed parameter applied in ultrasonic destruction process namely the sonication time of 4 hours and a frequency of 20 kHz. Result synthesis material absorber characterized by XRD, PSA and VNA. Optimal parameters of the digestion process ultrasonic for 4 hours, pulse 59:59, height 2 cm, amplitude 55%, medium aquadest resulting from the 15% HF etching process obtained a particle size of 229.8 nm, with a reflection loss value of -11.45 dB at the absorption level reached 92.83% at the 8-12 GHz frequency.
| Item Type: | Thesis (S1) | |||||||||
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| Additional Information: | Dalam bidang pertahanan dan keamanan, gelombang elektromagnetik memiliki peranan penting sebagai salah satu sistem yang dapat membantu dalam pengawasan keamanan suatu wilayah negara. Perkembangan serta pengetahuan terkait teknologi sistem radar (radio detection and ranging) berkaitan pada interaksi antara radiasi gelombang elektromagnetik dan materialnya. Material yang memiliki kemampuan untuk menyerap gelombang mikro, salah satunya adalah Barium hexaferrite (BHF). Material barium hexaferrite merupakan material ferromagnetic yang memiliki nilai koersivitas yang tinggi, saturasi magnetisasi dan temperatur transisi magnetik yang baik. Pada barium hexaferrite dapat menggunakan berbagai macam proses sintesis nanopartikel, yaitu metode mechanical alloying, sol-gel, co-precipitation, microemulsion, dan lain-lain. Berbagai macam cara dapat dilakukan, salah satunya dengan penambahan dopan. Penambahan dopan Mg-Al dengan rasio tertentu, dapat meningkatkan nilai dari reflection loss. Ditambah lagi, dengan adanya proses destruksi ulang sampel hingga berukuran nano dengan variasi ketinggian replacement tip dan pulse on:off dari alat destruksi ultrasonik, dapat mempengaruhi nilai reflection loss yang diperoleh. Oleh karena itu, perlu diamati dan dilakukannya penelitian bagaimana pengaruh destruksi ultrasonik dengan variasi ketinggian replacement tip, pulse on:off mesin destruksi ultrasonik, amplitudo, media suspense yang digunakan, serta perlakuan prekursor yang dilakuakan tahapan etching terlebih dahulu. Sampel dilakukan tahapn sintesis destruksi ultrasonic dengan variasi ketinggian replacement tip (1, 2, 3 dan 4 cm), pulse on:off (59:59, 49:49, 39:39, 29:29, 59:49, 59:39 dan 59:29), amplitude (35%, 45% dan 55%), media suspense (aquadest, ethanol dan ethylene glycol) dan konsentrasi etching agent HF (5%, 10% dan 15%). Parameter tetap yang diterapkan dalam proses destruksi ultrasonik ini, yaitu waktu sonikasi 4 jam dan frekuensi 20 kHz. Hasil sintesis material absorber dikarakterisasi XRD, PSA dan VNA. Parameter optimal proses destruksi ultrasonik selama 4 jam, pulse 59:59, ketinggian 2 cm, amplitudo 55%, media aquadest hasil proses etching HF 15% memperoleh ukuran partikel sebesar 229,8 nm, dengan nilai reflection loss sebesar -11,45 dB pada tingkat penyerapannya mencapai 92,83% di frekuensi 8-12 GHz. | |||||||||
| Subjects: | Q Science > Q Science (General) U Military Science > U Military Science (General) |
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| Divisions: | 03-Fakultas Teknik 03-Fakultas Teknik > 27201-Jurusan Teknik Metalurgi |
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| Depositing User: | Mr Ichsan Tubagus Maulana | |||||||||
| Date Deposited: | 05 Jun 2023 14:24 | |||||||||
| Last Modified: | 20 Sep 2024 13:25 | |||||||||
| URI: | http://eprints.untirta.ac.id/id/eprint/25118 |
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