PENGARUH VARIASI RAPAT ARUS PULSA TERHADAP PEMBENTUKAN DAN SIFAT MEKANIK LAPISAN KOMPOSIT Ni-Al2O3/Si3N4 DENGAN METODE ELEKTRODEPOSISI

NAJMI SYAHRO FADHLAN, . (2025) PENGARUH VARIASI RAPAT ARUS PULSA TERHADAP PEMBENTUKAN DAN SIFAT MEKANIK LAPISAN KOMPOSIT Ni-Al2O3/Si3N4 DENGAN METODE ELEKTRODEPOSISI. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.

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Abstract

Dengan menggunakan metode elektrodeposisi dan variasi rapat arus pulsa, pembentukan lapisan komposit Ni-Al2O3/Si3N4 pada substrat tungsten karbida (WC) menunjukkan hasil hubungan antara variasi rapat arus pulsa terhadap pembentukan dan sifat mekanik lapisan komposit Ni-Al2O3/Si3N4. Elektrodeposisi dilakukan selama 30 menit dengan temperatur 40 ºC dan kecepatan pengadukan 600 rpm. Variasi rapat arus yang digunakan, yaitu 0,3 mA/mm2 , 0,4 mA/mm2 , dan 0,5 mA/mm2 . Pengujian SEM-EDS menunjukkan semakin tinggi variasi rapat arus pulsa menghasilkan morfologi permukaan lapisan komposit Ni-Al2O3/Si3N4 yang semakin halus walaupun terdapat aglomerasi. Pengujian XRD menunjukkan semakin tinggi variasi rapat arus pulsa menghasilkan ukuran kristal pada fasa penyusun lapisan komposit Ni-Al2O3/Si3N4 yang semakin besar. Pengujian kekerasan Vickers menunjukkan semakin tinggi variasi rapat arus pulsa menghasilkan kekerasan lapisan komposit Ni-Al2O3/Si3N4 yang semakin meningkat pada variasi rapat arus optimal 0,4 mA/mm2 sebesar 1277,865 kgf/mm2 . Kata kunci: Komposit Ni-Al2O3/Si3N4, Elektrodeposisi, Rapat Arus Pulsa, Morfologi, Komposisi, Struktur Kristal, Kekerasan Vickers. ***** Using the electrodeposition method and variations in pulse current density, the formation of Ni-Al₂O₃/Si₃N₄ composite coatings on tungsten carbide (WC) substrates demonstrates the relationship between pulse current density variations and the formation and mechanical properties of the Ni-Al₂O₃/Si₃N₄ composite layer. Electrodeposition was carried out for 30 minutes at a temperature of 40 °C and a stirring speed of 600 rpm. The current density variations used were 0.3 mA/mm², 0.4 mA/mm², and 0.5 mA/mm². SEM-EDS testing showed that increasing the pulse current density resulted in a smoother surface morphology of the Ni-Al₂O₃/Si₃N₄ composite layer, although some agglomeration was observed. XRD analysis indicated that higher pulse current densities led to larger crystallite sizes in the phases composing the Ni-Al₂O₃/Si₃N₄ composite layer. Vickers hardness testing revealed that increasing the pulse current density improved the hardness of the NiAl₂O₃/Si₃N₄ composite layer, with the optimal current density of 0.4 mA/mm² achieving a hardness of 1277,865 kgf/mm2 . Keywords: Ni-Al₂O₃/Si₃N₄ Composite, Electrodeposition, Pulse Current Density, Morphology, Composition, Crystal Structure, Vickers Hardness. Using the electrodeposition method and variations in pulse current density, the formation of Ni-Al₂O₃/Si₃N₄ composite coatings on tungsten carbide (WC) substrates demonstrates the relationship between pulse current density variations and the formation and mechanical properties of the Ni-Al₂O₃/Si₃N₄ composite layer. Electrodeposition was carried out for 30 minutes at a temperature of 40 °C and a stirring speed of 600 rpm. The current density variations used were 0.3 mA/mm², 0.4 mA/mm², and 0.5 mA/mm². SEM-EDS testing showed that increasing the pulse current density resulted in a smoother surface morphology of the Ni-Al₂O₃/Si₃N₄ composite layer, although some agglomeration was observed. XRD analysis indicated that higher pulse current densities led to larger crystallite sizes in the phases composing the Ni-Al₂O₃/Si₃N₄ composite layer. Vickers hardness testing revealed that increasing the pulse current density improved the hardness of the NiAl₂O₃/Si₃N₄ composite layer, with the optimal current density of 0.4 mA/mm² achieving a hardness of 1277,865 kgf/mm2 .

Item Type:	Thesis (Sarjana)
Additional Information:	1). Prof. Dr. Esmar Budi, M. T. 2). Dr. Teguh Budi Prayitno, M. Si.
Subjects:	Sains > Fisika
Divisions:	FMIPA > S1 Fisika
Depositing User:	Najmi Syahro Fadhlan .
Date Deposited:	14 Aug 2025 04:09
Last Modified:	14 Aug 2025 04:09
URI:	http://repository.unj.ac.id/id/eprint/60662

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