Alviani, A.Marsha (2015) Analisa Pengaruh Ph Dan Temperatur Sintering Terhadap Struktur Mikro Dan Sifat Magnetik Barium Heksaferrit Didoping Ni-Zn Dengan Metode Sol-Gel Auto Combustion. Undergraduate thesis, Institut Technology Sepuluh Nopember.
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Abstract
Barium Heksaferrit (BaFe12O19) termasuk dalam material magnetik yang diteliti untuk penggunaan Radar Absorbing Material (RAM). Agar dapat digunakan sebagai aplikasi RAM, diperlukan adanya substitusi ion Fe pada Barium Heksaferrit. Adanya substitusi tersebut dapat mempengaruhi sifat kemagnetan berupa magnetisasi saturasi dan koersivitas. Pada penelitian ini dilakukan penambahan unsur paduan Ni – Zn. Barium Heksaferrit disintesa menggunakan metode Sol Gel Autocombustion dengan dopan Ni – Zn fraksi mol 0,6 serta variasi pH 7, 9, dan 11. Kemudian diberikan perlakuan dengan temperatur sintering pada 850, 950, dan 1050 oC selama 3 jam. Temperatur sintering akan berpengaruh pada pertumbuhan ukuran kristal Barium Heksaferrit. Analisa mengenai sifat kemagnetan dan struktur mikro dari Barium Heksaferrit dilakukan dengan pengujian SEM, XRD, dan VSM. Pengaruh penambahan unsur Ni-Zn pada Barium Heksaferrite yaitu semakin tinggi pH yang ditambahkan ukuran kristal akan semakin besar. Sehingga didapatkan ukuran kristal terkecil dengan nilai 70,29 nm pada pH 9 dengan temperatur sintering 1050oC dan terbesar yaitu 588,049 nm pada pH 11 dengan
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temperature sintering 850. Peningkatan pH akan mempengaruhi sifat kemagnetan dari Barium Heksaferrite. Nilai koersivitas paling rendah terjadi pada pH 9 Temperatur Sinter 1050oC dengan nilai koersivitas 0,05 Tesla. Pengaruh penambahan unsur Ni-Zn pada Barium Heksaferrite terhadap temperature sintering yaitu meningkatnya temperatur akan memperkecil ukuran kristal BaFe12O19. Temperatur Sinter semakin tinggi maka akan menyebabkan semakin naiknya nilai koersivitas dan saturasi magnet dari barium heksaferrit yang telah didoping Ni dan Zn. Nilai magnetik saturasi tertinggi terdapat pada pH 11 dengan temperature sintering 1050oC yaitu 95 emu/g dan nilai koersifitas 0,13T.
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Barium Hexaferrite (BaFe12O19) is magnetic materials for use at Radar Absorbing Material (RAM). Barium Hexaferrite is hard magnetic with high coercivity and magnetization. However, the specification for RAM need high magnetization but with low coercivity. Therefore, it is necessary to change the magnetic properties by substituting Fe ions with Ni, Zn, Co, Mn, Cu, and others to meet the requirement properties for RAM. In this study, we conduct the addition of alloying elements Ni - Zn on Barium Hexaferrite so that it can be applied as a RAM. Barium Hexaferrite synthesized using Sol Gel autocombustion method with dopant Ni – Zn; nole fraction of 0.6 and variation of pH 7, 9, and 11. Sintering treatment at a temperature of 850, 950 and 1050°C for 3 hours. An analysis of the magnetic properties and microstructure of barium Hexaferrite one performed by SEM, XRD, and VSM. Addition Ni-Zn in Barium Heksaferrite is to increase the crystal size of sample. The smallest value of crystal size is 70.29 nm at pH 9 with the sintering temperature 1050oC. And the largest is 588.049 nm at pH 11 to 850oC. Increasing of pH and sintering temperature will affect to magnetic properties of
barium Heksaferrite. The lowest coercivity value occurs at pH 9 Temperature Sintered 1050oC, 0.05 Tesla. The influence of addition Ni-Zn to element Barium Heksaferrite against sintering temperature is rising temperatures and will reduce the size of BaFe12O19 crystals. Sintered higher temperatures will increase the value of coercivity and magnetic saturation of barium heksaferrite that has been doped Ni and Zn. Magnetic saturation value is highest at pH 11 with sintering temperature 1050oC is 95 emu / g and the value coercivity is 0,13T.
| Item Type: | Thesis (Undergraduate) |
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| Additional Information: | RSMt 669.725 Alv a |
| Uncontrolled Keywords: | Barium Heksaferrit, pH dan Temperatur Sintering |
| Subjects: | T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL240.5 Composite materials |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 31 May 2019 02:37 |
| Last Modified: | 31 May 2019 02:37 |
| URI: | http://repository.its.ac.id/id/eprint/63083 |
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