PENGARUH RAPAT ARUS PULSA TERHADAP STRUKTUR DAN SIFAT MEKANIK LAPISAN KOMPOSIT Ni/Si₃N₄ PADA BAJA HIGH-SPEED STEEL MELALUI PROSES ELEKTRODEPOSISI ULTRASONIK

EZALICHA FATYA JASMINE, . (2026) PENGARUH RAPAT ARUS PULSA TERHADAP STRUKTUR DAN SIFAT MEKANIK LAPISAN KOMPOSIT Ni/Si₃N₄ PADA BAJA HIGH-SPEED STEEL MELALUI PROSES ELEKTRODEPOSISI ULTRASONIK. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.

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Abstract

EZALICHA FATYA JASMINE. Pengaruh Rapat Arus Pulsa terhadap Struktur dan Sifat Mekanik Lapisan Komposit Ni/Si₃N₄ pada Baja High-Speed Steel melalui Proses Elektrodeposisi Ultrasonik. Skripsi, Program Studi Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Jakarta, Juli 2026. Di bawah bimbingan ESMAR BUDI dan SITI JULIA. Penelitian ini bertujuan menganalisis pengaruh variasi rapat arus pulsa terhadap karakteristik lapisan komposit Ni/Si₃N₄ pada substrat High-Speed Steel (HSS) yang disintesis menggunakan metode Ultrasonic-Assisted Pulse Electrodeposition (UAED). Variasi rapat arus pulsa yang digunakan yaitu 0,024; 0,040; dan 0,056 mA/mm². Karakterisasi lapisan komposit dilakukan menggunakan X-Ray Diffraction (XRD), Scanning Electron Microscopy–Energy Dispersive Spectroscopy (SEM–EDS), dan uji kekerasan Vickers untuk mengevaluasi pengaruh variasi rapat arus terhadap struktur kristal, morfologi permukaan, komposisi unsur, dan sifat mekanik lapisan. Hasil penelitian menunjukkan bahwa seluruh lapisan komposit tersusun atas fase β-Si₃N₄, Ni, dan CrFe tanpa terbentuk fase kristal baru. Variasi rapat arus pulsa tidak mengubah fase kristal yang terbentuk, tetapi memengaruhi ukuran kristalit fase Ni dan β-Si₃N₄, internal stress, morfologi permukaan, distribusi unsur, serta nilai kekerasan Vickers. Peningkatan rapat arus hingga 0,040 mA/mm² menghasilkan ukuran kristalit Ni terkecil, sedangkan peningkatan rapat arus hingga 0,056 mA/mm² menyebabkan distribusi morfologi lapisan menjadi kurang homogen dan diikuti penurunan nilai kekerasan Vickers. Hasil penelitian menunjukkan bahwa kondisi deposisi paling optimum diperoleh pada rapat arus pulsa 0,024 mA/mm², yang menghasilkan lapisan paling homogen dengan nilai kekerasan Vickers tertinggi sebesar 859,63 HV (8,43 GPa). Kata Kunci: komposit Ni/Si₃N₄; elektrodeposisi; arus pulsa; ultrasonik; mikrostruktur; kekerasan Vickers. ***** EZALICHA FATYA JASMINE. The Effect of Pulse Current Density on the Structure and Mechanical Properties of Ni/Si₃N₄ Composite Coatings on High Speed Steel by Ultrasonic-Assisted Electrodeposition. Undergraduate Thesis, Physics Study Program, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, July 2026. Under the supervision of ESMAR BUDI and SITI JULIA. This study aims to analyze the effect of pulse current density on the characteristics of Ni/Si₃N₄ composite coatings deposited on High-Speed Steel (HSS) substrates using the Ultrasonic-Assisted Pulse Electrodeposition (UAED) method. The pulse current densities employed were 0.024, 0.040, and 0.056 mA/mm². The composite coatings were characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy–Energy Dispersive Spectroscopy (SEM–EDS), and Vickers hardness testing to evaluate the influence of pulse current density on the crystal structure, surface morphology, elemental composition, and mechanical properties of the coatings. The results showed that all composite coatings consisted of β-Si₃N₄, Ni, and CrFe phases without the formation of any new crystalline phases. Although variations in pulse current density did not alter the crystalline phases, they affected the crystallite size of the Ni and β-Si₃N₄ phases, internal stress, surface morphology, elemental distribution, and Vickers hardness. Increasing the pulse current density to 0.040 mA/mm² produced the smallest Ni crystallite size, whereas increasing it to 0.056 mA/mm² resulted in a less homogeneous morphological distribution accompanied by a decrease in Vickers hardness. The optimum deposition condition was obtained at a pulse current density of 0.024 mA/mm², producing the most homogeneous coating with the highest Vickers hardness of 859.63 HV (8.43 GPa). Keywords: Ni/Si₃N₄ composite; electrodeposition; pulse current; ultrasonic; microstructure; Vickers hardness.

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:	Ezalicha Fatya Jasmine .
Date Deposited:	07 Aug 2026 03:43
Last Modified:	07 Aug 2026 03:43
URI:	http://repository.unj.ac.id/id/eprint/68724

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