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All Journal SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Rekayasa Mesin PRODUCTUM : Jurnal Desain Produk (Pengetahuan dan Perancangan Produk) JURNAL SAINTIS
Muhammad Ilham Maulana
Institut Teknologi Kalimantan
Arts Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Oxide Inclusions Removal on Microstructure Properties of As-Cast Cobalt-Based Alloys Maulana, Muhammad Ilham
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 18 No. 2 (2024): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.18.2.64-70

Abstract

A cobalt-based metal alloying process was conducted with the addition of the non-metallic element boron (B) using vacuum arc remelting (VAR). The process employed a water-cooled copper mold within an argon atmosphere. This research aimed to investigate the resulting microstructure and surface hardness values of the alloy. The metal melting rate during the VAR process was carefully controlled to achieve the desired microstructure and minimize defects, ensuring the production of high-quality alloys post-solidification. The process effectively facilitated the removal of oxide inclusions through flotation during remelting. The resulting alloy exhibited a dendritic microstructure characterized by large grain sizes. The average hardness value obtained for the alloy was 27.53 HRC.
Sintesis dan Analisis Penambahan Doping Magnesium (Mg) pada Material Superkonduktor FeSe dengan Metode Reaksi Padatan dalam Tabung Tertutup: Synthesis and Analysis of Magnesium-doped in FeSe Superconductor Materials with Solid-state Reaction Method in Sealed Tubes Maulana, Muhammad Ilham
JURNAL SAINTIS Vol. 19 No. 2 (2019)
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1161.579 KB) | DOI: 10.25299/saintis.2019.vol19(2).3185

Abstract

[ID] Ketergantungan manusia terhadap teknologi memasuki Revolusi Industri 4.0 sangat tinggi. Contoh penerapan inovasi di bidang teknologi informasi salah satunya adalah superkomputer dari material superkonduktor. Material superkonduktor identik dengan material non ferromagnetik karena sifatnya diamagnetis sempurna. Namun, sejak ditemukannya material superkonduktor berbasis logam ferromagnetik, penelitian terus dikembangkan, salah satunya material FeSe. Beberapa parameter yang perlu diperhatikan pada pembuatan material FeSe untuk memperoleh sifat superkonduktor terbaiknya diantaranya komposisi stoikiometri, penambahan doping, dan proses pembuatan material FeSe seperti proses pemaduan dan sintering. Dalam penelitian ini, pengaruh variasi doping Mg akan dianalisis terhadap sifat superkonduktor, morfologi, dan fasa yang terbentuk pada material superkonduktor FeSe. Material FeSe dibuat dengan metode reaksi padatan dalam tabung tertutup (Powder in Sealed Tube) secara insitu. Temperatur sintering yang digunakan 845⁰C yang ditahan selama 6 jam, dengan kenaikan temperatur 7⁰C/menit dari temperatur kamar, dan laju pendinginan normalizing. Kandidat material superkonduktor terbaik terdapat pada sampel Mg0.01Fe0.99Se. Didapatkan Temperatur kritis (Tc)onset = 15.42 K dan Tczero = 5.4 K. Morfologi sampel menunjukkan kristalisasi besar. Lalu, persentase fraksi volume fasa superkonduktornya juga merupakan yang terbesar yaitu 81.99%. [EN] Human dependence on technology into the Industrial Revolution 4.0 is very high. Example, the application of innovations in information technology is supercomputer from superconducting materials. Superconducting materials are identical from non-ferromagnetic materials because tend perfectly diamagnetic. However, since ferromagnetic-metal-based superconducting material discovered, research continues to be developed, like FeSe material. Some parameters that need to be considered in making FeSe material to obtain the best superconductor properties include stoichiometric composition, doping addition, and process of making FeSe materials like synthesis and sintering treatment. In this study, the effect of Mg-doped variations will be analyzed towards properties of superconductors, morphology, and phases formed in FeSe superconducting materials. MgxFe1-xSe made by solid-state reaction method in sealed tube (Powder in Sealed Tube) “insituely”. The sintering temperature used 845⁰C which held for 6 hours, with 7⁰C/minute temperature rise from room-temperature and normalizing cooling rate used. The best candidate superconducting material came from Mg0.01Fe0.99Se, obtained critical temperature (Tc)onset = 15.42 K, and Tczero = 5.4 K. Sample morphology shows a large crystallization. Then, the percentage fraction of the superconducting phase was also the largest, which is 81.99%.
CHARACTERIZATION OF FESE SUPERCONDUCTOR MATERIAL WITH MAGNESIUM DOPING VIA POWDER METALLURGY AND QUENCHING METHOD Maulana, Muhammad Ilham
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1903

Abstract

The effect of magnesium (Mg) content on the resistivity, microstructure, and phase characteristics of iron selenide (FeSe) was investigated. The investigation employed the Powder in Sealed Tube (PIST) method to fabricate components with intricate geometries and high dimensional precision. MgₓFe₁₋ₓSe samples (x = 0; 0.01; 0.05; 0.1) were synthesized via hand milling of high-purity Fe, Se, and Mg powders, compacted in sealed Stainless Steel (SS) 316 tubes, and sintered at 845 °C for 6 h with water quenching. Resistivity was characterized based on electrical measurements at the low temperature, surface morphology was evaluated through Scanning Electron Microscope (SEM) imaging, and phase formation was identified via X-ray Diffraction (XRD) analysis. Based on normalized measurements, the addition of 5 at% Mg results in a resistivity reduction of up to ~39%, representing the most pronounced drop across the tested compositions. MgₓFe₁₋ₓSe samples exhibits a denser and more homogeneous appearance. FeSe samples doped with varying amounts of Mg display a bulky appearance, a hallmark feature associated with powder metallurgy techniques. The presence of β-FeSe phase identified through XRD testing validates the material's composition and crystalline structure, providing essential insights into its superconducting behavior and paving the way for further detailed characterization.
Perancangan produk alat pengupas kulit dan pemipil biji jagung dengan Metode AHOQ di Kecamatan Silaen Siagian, Wesly Mailander; Silaen, Willy Cristover; Prasetyo, Tegar Arifin; Maulana, Muhammad Ilham
PRODUCTUM Jurnal Desain Produk (Pengetahuan dan Perancangan Produk) Vol 8, No 2 (2025)
Publisher : Institut Seni Indonesia Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24821/productum.v8i2.14926

Abstract

The farmer group in the Silaen sub-district which is located in Toba Regency is a farmer group where the majority of farmers are corn farmers. The general problems faced by this farmer group include the ineffectiveness of the harvest process where farmers have to peel and dry the corn before the corn is ground using a corn sheller machine. Therefore, this research was carried out in order to answer the problems faced by this farmer group. Where in this research we will design a machine for peeling and shelling corn, so that farmers will be more practical when carrying out the harvest process. In this research, the Axiomatic House of Quality (AHOQ) method was used by integrating it with the House of Quality (HOQ) and Axiomatic design (AD). Then you will get a design and specifications for a corn peeling and shelling machine that uses an oil-fueled engine.
Co-Authors Prasetyo, Tegar Silaen, Willy Cristover Wesly Mailander Siagian