HIDAYAH, A IMAM (2026) ANALISIS PENGARUH PROSES METALURGI SERBUK DALAM PREPARASI PADUAN MN-NI-SI DI LABORATORIUM MATERIAL MAJU UNIVERSITAS MERCU BUANA. S1 thesis, Universitas Mercu Buana Jakarta.
|
Text (HAL COVER)
01 Cover.pdf Download (354kB) | Preview |
|
![[img]](https://repository.mercubuana.ac.id/style/images/fileicons/text.png) |
Text (BAB I)
02 Bab 1.pdf Restricted to Registered users only Download (248kB) |
|
|
Text (BAB II)
03 Bab 2.pdf Restricted to Registered users only Download (1MB) |
|
|
Text (BAB III)
04 Bab 3.pdf Restricted to Registered users only Download (234kB) |
|
|
Text (DAFTAR PUSTAKA)
05 Daftar Pustaka.pdf Restricted to Registered users only Download (181kB) |
|
|
Text (LAMPIRAN)
06 Lampiran.pdf Restricted to Registered users only Download (215kB) |
Abstract
This engineering study aims to analyze the influence of powder metallurgy processes on the preparation of MnNiSi alloys, utilizing a combination of arc melting, annealing, ball milling, and Spark Plasma Sintering (SPS), to produce high-density bulk material with improved mechanical properties while retaining its magnetocaloric characteristics. The variables investigated include powder preparation parameters (annealing conditions, ball milling durations of 30, 60, and 90 minutes, and SPS processing), while the observed response variables include crystal structure, microstructure, particle size, phase homogeneity, and the characteristics of the synthesized material. The research samples consisted of MnNiSi alloys with a stoichiometric composition of Mn:Ni:Si = 1:1:1 and a total mass of 20 grams, fabricated at the Advanced Materials Laboratory of Universitas Mercu Buana. A purposive sampling technique based on laboratory experiments was employed, involving the selection of samples according to a predetermined compositional design. Data analysis was conducted using a descriptive comparative method based on material characterization via X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Backscattered Electron (BSE) imaging, Energy Dispersive Spectroscopy (EDS), and laser microscopy. The results indicate that annealing at 1000°C for 5 days enhanced the formation of a purer single-phase MnNiSi by eliminating Mn-rich secondary phases. Ball milling successfully reduced powder particle sizes from approximately 7 µm to 4 µm and 2 µm for milling durations of 30, 60, and 90 minutes, respectively. XRD analysis revealed that the orthorhombic structure of MnNiSi was preserved following the ball milling process, indicating that the crystal structure of the primary material remained unaltered. Based on these results, it can be concluded that the combination of arc melting, annealing, ball milling, and SPS processes is an effective method for producing a homogeneous, single-phase MnNiSi alloy with finer particle size, which has the potential to be developed as a magnetocaloric material candidate for magnetic refrigeration applications. Keywords: MnNiSi Alloy, MCE, SPS, Magnetic refrigeration Praktik keinsinyuran ini bertujuan menganalisis pengaruh proses metalurgi serbuk dalam preparasi paduan MnNiSi melalui kombinasi tahapan arc melting, annealing, ball milling, dan Spark Plasma Sintering (SPS) untuk menghasilkan material curah (bulk material) yang memiliki densitas tinggi, sifat mekanik yang lebih baik, serta tetap mempertahankan karakteristik magnetokaloriknya. Variabel yang diteliti meliputi parameter proses preparasi serbuk (kondisi annealing, durasi ball milling 30, 60, dan 90 menit, serta proses SPS), sedangkan variabel respons yang diamati adalah struktur kristal, mikrostruktur, ukuran partikel, homogenitas fasa, dan karakteristik material hasil sintesis. Sampel penelitian berupa paduan MnNiSi dengan komposisi stoikiometri Mn:Ni:Si = 1:1:1 dan massa total 20 gram yang difabrikasi di Laboratorium Material Maju Universitas Mercu Buana. Teknik pengambilan sampel yang digunakan adalah purposive sampling berbasis eksperimen laboratorium, yaitu pemilihan sampel sesuai desain komposisi yang telah ditentukan. Analisis data dilakukan menggunakan metode analisis deskriptif komparatif berbasis karakterisasi material melalui X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Backscattered Electron (BSE), Energy Dispersive Spectroscopy (EDS), dan pengamatan mikroskopi laser. Hasil penelitian menunjukkan bahwa proses anil pada suhu 1000°C selama 5 hari mampu meningkatkan pembentukan fase tunggal MnNiSi yang lebih murni dengan menghilangkan fase sekunder kaya Mn. Proses ball milling berhasil memperkecil ukuran partikel serbuk dari sekitar 7 µm menjadi 4 µm dan 2 µm untuk waktu penggilingan 30, 60, dan 90 menit. Analisis XRD menunjukkan bahwa struktur ortorombik MnNiSi tetap terjaga setelah proses ball milling, sehingga tidak mengubah struktur kristal utama material. Berdasarkan hasil tersebut dapat disimpulkan bahwa kombinasi proses arc melting, annealing, ball milling, dan SPS merupakan metode yang efektif untuk menghasilkan paduan MnNiSi homogen dengan fase tunggal, ukuran partikel yang lebih halus, serta berpotensi dikembangkan sebagai kandidat material magnetokalorik untuk aplikasi pendinginan magnetik. Kata Kunci : Paduan MnNiSi, MCE, SPS, Pendingin Magnetik
Actions (login required)
 |
View Item |
