PENGARUH VARIASI RAPAT ARUS PULSA TERHADAP STRUKTUR DAN SIFAT MEKANIK LAPISAN KOMPOSIT Ni-AlN/Si3N4 HASIL ELEKTRODEPOSISI ULTRASONIK PADA SUBSTRAT BAJA HIGH SPEED STEEL

ARINI, . (2026) PENGARUH VARIASI RAPAT ARUS PULSA TERHADAP STRUKTUR DAN SIFAT MEKANIK LAPISAN KOMPOSIT Ni-AlN/Si3N4 HASIL ELEKTRODEPOSISI ULTRASONIK PADA SUBSTRAT BAJA HIGH SPEED STEEL. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.

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Abstract

Penelitian ini bertujuan untuk menganalisis pengaruh variasi rapat arus pulsa terhadap struktur kristal, morfologi permukaan, komposisi unsur, dan sifat mekanik lapisan komposit Ni–AlN/Si₃N₄ yang dideposisikan pada substrat High-Speed Steel (HSS) menggunakan metode Ultrasonic-Assisted Pulse Electrodeposition (UAED). Variasi rapat arus pulsa yang digunakan yaitu 0,064 mA/mm², 0,072 mA/mm², dan 0,080 mA/mm². Karakterisasi lapisan dilakukan menggunakan X Ray Diffraction (XRD), Scanning Electron Microscopy–Energy Dispersive Spectroscopy (SEM–EDS), serta uji kekerasan Vickers. Hasil penelitian menunjukkan bahwa lapisan komposit tersusun atas fasa Ni, Aluminium, β-Si₃N₄, dan CrFe. Peningkatan rapat arus pulsa meningkatkan ukuran kristalit rata-rata dari 27,76 nm menjadi 32,69 nm tanpa membentuk fasa baru, namun memengaruhi orientasi kristal β-Si₃N₄. Nilai kekerasan Vickers meningkat dari 766,47 HV (7,52 GPa) pada 0,064 mA/mm² menjadi 878,80 HV (8,62 GPa) pada 0,072 mA/mm², kemudian menurun menjadi 753,70 HV (7,39 GPa) pada 0,080 mA/mm². Hasil SEM–EDS menunjukkan bahwa variasi rapat arus memengaruhi morfologi permukaan, distribusi partikel, dan komposisi unsur lapisan komposit. Berdasarkan hasil karakterisasi struktur kristal, morfologi, komposisi unsur, dan sifat mekanik, rapat arus pulsa 0,072 mA/mm² menghasilkan karakteristik lapisan paling optimum dengan kombinasi ketebalan lapisan dan kekerasan tertinggi.***** This study investigates the effect of pulse current density on the crystal structure, surface morphology, elemental composition, and mechanical properties of Ni AlN/Si₃N₄ composite coatings deposited on High-Speed Steel (HSS) substrates using the Ultrasonic-Assisted Pulse Electrodeposition (UAED) method. Pulse current densities of 0.064, 0.072, and 0.080 mA/mm² were applied. The coatings were characterized using X-ray Diffraction (XRD), Scanning Electron Microscopy coupled with Energy Dispersive Spectroscopy (SEM–EDS), and Vickers hardness testing. The results revealed that the coatings consisted of Ni, Al, β-Si₃N₄, and CrFe phases. Increasing the pulse current density increased the average crystallite size from 27.76 nm to 32.69 nm without forming new phases, but it altered the preferred crystal orientation of β-Si₃N₄. The Vickers hardness increased from 766.47 HV (7.52 GPa) at 0.064 mA/mm² to a maximum of 878.80 HV (8.62 GPa) at 0.072 mA/mm², then decreased to 753.70 HV (7.39 GPa) at 0.080 mA/mm². SEM–EDS analysis showed that pulse current density influenced the surface morphology, particle distribution, and elemental composition of the composite coatings. Overall, the coating deposited at 0.072 mA/mm² exhibited the optimum characteristics, providing the best combination of coating thickness and mechanical performance.

Item Type:	Thesis (Sarjana)
Additional Information:	1). Prof. Dr. Esmar Budi, M.T. ; 2). Siti Julia, M.Si.
Subjects:	Sains > Fisika
Divisions:	FMIPA > S1 Fisika
Depositing User:	Arini .
Date Deposited:	20 Aug 2026 07:55
Last Modified:	20 Aug 2026 07:55
URI:	http://repository.unj.ac.id/id/eprint/72260

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