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Metal Indonesia
Published by Balai Besar Logam dan Mesin
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Core Subject : Science, Engineering,
Engineering Materials Science & Nanotechnology Mechanical Engineering
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Articles 163 Documents
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Understanding the Impact of Mold Position on Brass Casting Microstructure and Hardness : An Observational Study by Production Operators Mirza Wibisono; Nyoman Jujur; Iwan Setyadi; Suryadi Suryadi; E.H. Muslim; Nandang S.; Joni Syah; P.S. Hadi; W.A. Giri; Tika Mustika; Krisna Adhtya; Arif Hidayat
Jurnal Metal Indonesia Vol 45, No 2 (2023): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32423/jmi.2023.v45.60-65

Abstract

The observation material was produced through the casting process, with a solar-powered crucible melting furnace. The molds used in the observation process consist of two positions, namely vertical and horizontal. The cartridge brass produced is in accordance with the ASTM B36 C26000 material standard.The slab of brass has a better level of homogeniity than the horizontal mold. The size of the dendrite α grains is smaller due to the slow freezing of the molten metal, which makes the growth of new dendrite α grains. The casting solidification begins from the part of the metal in contact with the mold, that is when the heat from the molten metal is taken by the mold so that the part of the metal in contact with the mold cools down to the freezing point, where the nuclei of the crystals grow. The inside of the casting cools down more slowly than the outside, so the crystals grow from the original nucleus towards the inside of the casting and the crystal grains are long and columnar in shape, which is called columnar structure. The cooling rate is faster than the inside of the casting, so the outside is softer, compared to the inside, harder. By carefully managing the cooling rate, manufacturers can control the microstructure of cartridge brass cast in permanent molds. This allows them to tailor the mechanical properties and overall performance of the final product to meet specific application requirements.
Preface Metal Indonesia Vol. 45 No. 2 2023 Admin Jurnal Metal
Jurnal Metal Indonesia Vol 45, No 2 (2023): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32423/jmi.2023.v45.I-III

Abstract

Pengaruh Pelapisan Nikel terhadap Sifat Magnet Bonded NdFeB Dadang Mulyadi; Agus Hermanto; Eva Afrilinda
Jurnal Metal Indonesia Vol 45, No 2 (2023): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32423/jmi.2023.v45.66-71

Abstract

Magnet permanen dengan senyawa NdFeB mempunyai sifat fisik mudah korosi yang akan merusak nilai karakteristik magnet. Telah dilakukan rekayasa permukaan fisik terhadap magnet bonded NdFeB dengan lapisan nikel melalui proses elektroplating. Magnet Bonded NdFeB diperoleh dari serbuk komersil Magnequench Type MQEP 16-7 yang bersifat logam dengan kandungan polimer 1,7%, kemudian dikompaksi pada tekanan 4 ton dan dipanaskan pada temperatur 1500C selama 2 jam. Sampel yang terbentuk diukur sifat konduktornya menggunakan ohm-meter kemudian dilakukan pelapisan nikel melalui proses elektroplating dengan variasi waktu, 15, 30 dan 60 menit, juga dilakukan variasi pemberian arus sebesar 0,3, 0,5 dan 0,7 amper. Karakterisasi sifat magnet diuji menggunakan alat permagraph Magnet Phisyk-Germany kemudian dibandingkan antara sebelum dan sesudah dilakukan pelapisan nikel. Hasil yang didapat menunjukkan bahwa perlakuan pelapisan nikel melalui proses elektroplating selain untuk memperlambat sifat korosi juga dapat meningkatkan nilai koersifitas magnet (Hcj), hasil terbaik dengan nilai koersifitas (Hcj) tertinggi 435 kiloAmper per meter (kA/m) diperoleh ketika pemberian arus sebesar 0,7 amper selama 15 dan 30 menit dan nilai magnet remanen Br = 0,48 Tesla (T), nilai energi produk maksimum (BHmax)= 35.17 kilo Joule per meter kubik (kJ/m3). AbstractPermanent magnets with NdFeB compounds have physical properties that are easy to corrode which will damage the value of magnetic characteristics. Physical surface treatment on bonded NdFeB magnets, with a layer of nickel by an electroplating technique has been done. Bonded NdFeB magnets are obtained from commercial magnetic powder quench MQEP 16-7 type which is metallic magnetic powder content of 98.3% and epoxy  of 1.7%.  X gram of the magnetic powder was compacted at pressure 4 tons and heated at a temperature of 1500C for 2  hours. The conductor properties of samples formed were measured using ohm-meter, then nickel plating through electroplating process with variations in time 15, 30 and 60 Minutes, also variations in the provision of current of 0.3, 0.5 and 0.7 amperes. Characterization of magnetic properties was tested using Permagraph Magnet Phisyk-Germany, then compared between before and after nickel plating. The results obtained show that nickel plating treatment through the electroplating process in addition to slowing corrosion properties can also increase the magnetic coerciveness value (Hcj), the best results with the highest coerciveity value (Hcj) of 435 kiloAmper per meter (kA/m) are obtained when applying a current of 0.7 amper for 15 and 30 minutes and the remanent magnetic (Br) = 0.48 Tesla (T),  maximum energy product (BHmax)= 35.17 kilo Joules per cubic meter (kJ/m3).

Page 17 of 17 | Total Record : 163

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