PENGARUH RAPAT ARUS PULSA TERHADAP PEMBENTUKAN DAN KARAKTERISASI LAPISAN KOMPOSIT Ni-TiN/Si3N4 DENGAN METODE ELEKTRODEPOSISI

ARSYAN FADILAH, . (2024) PENGARUH RAPAT ARUS PULSA TERHADAP PEMBENTUKAN DAN KARAKTERISASI LAPISAN KOMPOSIT Ni-TiN/Si3N4 DENGAN METODE ELEKTRODEPOSISI. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.

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Abstract

Telah dilakukan pembuatan sistem pulse generator dengan menggunakan rangkaian PWM. Rangkaian ini dapat menghasilkan arus pulsa berupa gelombang persegi panjang yang dapat diamati melalui osiloskop. Dengan menggunakan potensiometer, nilai duty cycle (lebar pulsa) dan ketinggian pulsa dapat disesuaikan. Dengan menggunakan sistem pulse generator ini, telah dilakukan pembentukan, karakterisasi serta analisis pengaruh variasi rapat arus pulsa terhadap lapisan komposit Ni-TiN/Si3N4, variasi yang digunakan yaitu 0,25 mA/mm2, 0,4 mA/mm2, dan 0,55 mA/mm2. Proses elektrodeposisi dengan menggunakan suhu sebesar 40℃ dan waktu pelapisan selama 30 menit. Sampel dianalisis morfologi dan komposisinya menggunakan SEM-EDS. Selanjutnya dianalisis dengan X-Ray Diffraction (XRD) untuk mengetahui struktur kristal dan ukuran kristal, serta dianalisis tingkat kekerasannya menggunakan metode kekerasan Vickers. Hasil karakterisasi menunjukkan bahwa semakin tinggi rapat arus pulsa, semakin halus morfologi permukaan lapisan komposit Ni-TiN/Si3N4 yang terbentuk. Selain itu, peningkatan rapat arus menyebabkan penaikan ukuran kristal dan peningkatan kekerasan. Tingkat kekerasan optimum sebesar 1970,3548 kgf/mm2 didapatkan pada lapisan komposit Ni-TiN/Si3N4 dengan rapat arus pulsa 0,4 mA/mm2. Dengan ini dapat dianalisa bahwa kekerasan meningkat seiring dengan peningkatan rapat arus pulsa, dan kekerasan kembali menurun saat mencapai rapat arus 0,55 mA/mm2. Kata kunci: pulse generator, lapisan komposit Ni-TiN/Si3N4, elektrodeposisi, rapat arus pulsa, morfologi permukaan. ***** A pulse generator system using PWM circuit has been made. This circuit can produce a pulse current in the form of a rectangular wave that can be observed through an oscilloscope. By using a potentiometer, the duty cycle value (pulse width) and pulse height can be adjusted. Using this pulse generator system, the formation, characterization and analysis of the effect of pulse current density variations on the Ni-TiN/Si3N4 composite layer have been carried out, the variations used are 0.25 mA/mm2, 0.4 mA/mm2, and 0.55 mA/mm2. The electrodeposition process used a temperature of 40℃ and a coating time of 30 minutes. The samples were analyzed for morphology and composition using SEM-EDS. Furthermore, it was analyzed by X-Ray Diffraction (XRD) to determine the crystal structure and crystal size, and analyzed for hardness using the Vickers hardness method. The characterization results show that the higher the pulse current density, the smoother the surface morphology of the Ni-TiN/Si3N4 composite layer formed. In addition, increasing the current density leads to an increase in crystal size and an increase in hardness. The optimum hardness level of 1970.3548 kgf/mm2 was obtained on the Ni-TiN/Si3N4 composite coating with a pulse current density of 0.4 mA/mm2. It can be analyzed that the hardness increases as the pulse current density increases, and the hardness decreases again when reaching a current density of 0.55 mA/mm2. Keywords: pulse generator, Ni-TiN/Si3N4 composite coating, electrodeposition, pulse current density, surface morphology.

Item Type: Thesis (Sarjana)
Additional Information: 1). Dr. Esmar Budi, M.T 2). Dr. Teguh Budi Prayitno, M.Si
Subjects: Sains > Fisika
Divisions: FMIPA > S1 Fisika
Depositing User: Users 24467 not found.
Date Deposited: 12 Aug 2024 01:15
Last Modified: 12 Aug 2024 01:15
URI: http://repository.unj.ac.id/id/eprint/49598

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