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Metalurgi

metalurgi
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Published by BRIN Publishing

ISSN : 01263188 EISSN : 24433926 DOI : 10.55981/metalurgi

Core Subject : Science, Engineering,

Industrial & Manufacturing Engineering Materials Science & Nanotechnology

The objective of this journal is the online media for disseminating results in Research and Development and also as a media for a scientist and researcher in the field of Metallurgy and Materials. The scope if this journal related on: Advanced materials and Nanotechnology Materials and Mineral characterization and Analysis Metallurgy process: extractive Ceramic and composite Corrosion and its technological protection Mineral resources manifestation Modelling and simulation in materials and metallurgy Engineering Metallurgy instrument

Arjuna Subject : Ilmu Material (semua kategori) - Ilmu Material (Lain-Lain)

Articles 287 Documents

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Pendekatan Persamaan Ginzburg – Landau dalam Superkonduktifitas Tipe II[APPROXIMATION OF GINZBURG – LANDAU EQUATIONS IN TYPE II SUPERCONDUCTIVITY] Andika Widya Pramono; Anton Suryantoro
Metalurgi Vol 27, No 3 (2012): Metalurgi Vol.27 No.3 Desember 2012
Publisher : National Research and Innovation Agency (BRIN)

Studi Recovery Tembaga dari Limbah Elektrolit Pemurnian Perak Menggunakan Proses Ekstraksi Pelarut Electrowinning dengan Mextral 5640H Sebagai Ekstraktan [Study of Copper Recovery from Spent Electrolyte Silver by Solvent Extraction – Electrowinning Using Mextral 5640 H] Muhammad Wildanil Fathoni; Muhammad Zaki Mubarok
Metalurgi Vol 32, No 1 (2017): Metalurgi Vol. 32 No. 1 April 2017
Publisher : National Research and Innovation Agency (BRIN)

Numerous investigations have been done forvaluable metals recovery from liquid waste. One of the methods that has been used is solvent extraction – electrowinning. In this paper, copper recovery from spent electrolyte of silver electrorefining by solvent extraction, stripping and electrowining is discussed. A series of copper solvent extraction experiments using Mextral 5640H were conducted on two types of spent electrolyte samples. The first sample is spent electrolyte of silver electrorefining without treatment and has nitrate matrix, while the second one is the spent electrolyte that has undergone silver deposition process by chloride salt addition, thus has a chloride matrix. The solvent extraction experiments by using the first spent electrolyte sample did not result in adequate copper extraction and was not selective to silver. By using 15% (v/v) Mextral 5640H, co-extraction of silver reached 10%, while extracted copper was only 31%. Solvent extraction tests with the second spent electrolyte sample resulted in the highest copper extraction of 97% at 25% (v/v) Mextral 5640H, equilibrium pH 2, O/A ratio 2/1 and temperature 25 °C. The analysis revealed that copper extraction in chloride solution by Mextral 5640H is an exothermic process with ΔH value of -2.97 kJ/mole. The highest recovery of stripping process was 87.1% obtained at 200 g/L sulfuric acid, O/A ratio 2/1 and temperature 46 °C with copper concentration in aquesous solution of 50 g/L. Current efficiency of electrowining process was 98.7%, with cell voltage of 2.4 volt and electrical energy consumption of 2077 kWh/ton of copperAbstrakPenelitian mengenai rekoveri logam berharga dari limbah telah banyak dilakukan. Salah satu caranya adalah melalui proses ekstraksi pelarut – elektrowining. Dalam paper ini didiskusikan proses rekoveri tembaga dari limbah elektrolit pemurnian perak mulai dari proses ekstraksi pelarut, stripping sampai elektrowining. Serangkaian percobaan ekstraksi pelarut dilakukan terhadap dua jenis sampel limbah elektrolit, sampel pertama merupakan limbah elektrolit tanpa pengolahan terlebih dahulu sedangkan sampel kedua merupakan limbah elektrolit yang sudah mengalami proses pengendapan perak. Hasil percobaan dengan menggunakan sampel pertama kurang begitu baik, ekstraktan Mextral 5640H tidak selektif terhadap perak. Dengan menggunakan konsentrasi ekstraktan 15% koekstraksi Ag mencapai 10% sedangkan ekstraksi Cu hanya 32%. Percobaan ekstraksi pelarut dengan menggunakan sampel kedua mencapai ekstraksi tertinggi sebesar 97% yang diperoleh pada konsentrasi ekstraktan 25%, pH kesetimbangan 2, nisbah O/A 2 dan temperatur 25 °C. Saat proses ekstraksi berlangsung, satu mol ion Cu2+ akan bereaksi dengan 5 mol ekstraktan untuk membentuk senyawa kompleks, reaksi tersebut melepaskan ion H+ sebanyak setengah mol. Nilai ΔH proses ekstraksi sebesar -2,97 kJ yang bersifat eksotermis. Rekoveri proses stripping tertinggi diperoleh sebesar 87,07% yang diperoleh pada konsentrasi asam sulfat 200 gpl, nisbah O/A 2 dan temperatur operasi 46 °C. Kadar tembaga dalam elektrolit yang dihasilkan mencapai 50 gpl. Efisiensi arus proses elektrowining sebesar 98,67%, efisiensi tegangan sebesar 37,08% dan efisiensi energi sebesar 36,59%. Konsumsi energi proses elektrowining sebesar 2077 kWh/ton tembaga.

Effect of Heating Temperature and Die Insert Draft Angle on the Flowability of Hot Forged SCM435 Steel Sofyan, Nofrijon; Heruwiyono, Maulana; Yuwono, Akhmad Herman; Dhaneswara, Donanta
Metalurgi Vol 37, No 2 (2022): Metalurgi Vol. 37 No. 2 Agustus 2022
Publisher : National Research and Innovation Agency (BRIN)

The problem of flowability in a closed forging process for heavy equipment industry is still widely found and this may affect the quality of the resulting product. To obtain the solution for this problem, in this work, the effect of heating temperature and die insert draft angle on the characteristic of hot forged SCM435 steel used for undercarriage track roller has been examined. The workpieces were heated at temperature variations of 1150 °C, 1200 °C, 1250 °C and were hot forged at die insert draft angles of 3°, 5°, and 7° to form undercarriage track roller products. The mechanical properties of the products were characterized through hardness and dimension examination, whereas the microstructure was characterized using an optical microscope. The results showed that increasing the heating temperature and die insert draft angle resulted in good flowability. The best result was obtained from the heating temperature of 1250 °C at the die insert draft angle of 7°, with diameter and height of 191.2 mm and 53.6 mm, respectively. This characteristic of the obtained hot-forged product agreed with that of the specified forging design for the undercarriage track roller

PEMBUATAN BATANG PELET La2-2XSr1+2XMn2 O7 SEBAGAI BAHAN PENUMBUH KRISTAL TUNGGAL[ Agung Imaduddin
Metalurgi Vol 26, No 2 (2011): Metalurgi Vol.26 No.2 Agustus 2011
Publisher : National Research and Innovation Agency (BRIN)

Bahan oksida Mn telah lama diketahui mempunyai sifat magneto resistance (hambatan listrik dalam medan magnet) yang besar. Untuk dapat mempelajari sifat fisika dari elektronnya, diperlukan kristal tunggal dengan kualitas yang tinggi. (La, Sr) 1+n Mnn O3n+1 (n=2) yang mempunyai lapisan Mn-O yang berdekatan 2 lapis, mempunyai sifat magneto resistance yang terbesar dibandingkan grup n = 1, maupun n = ∞. Pada penelitian ini telah dipelajari proses pembuatan batang pellet yang digunakan sebagai bahan penumbuh kristal tunggal. Batang pellet hasil proses kemudian dianalisa dengan DTA/DTG (Differential Thermal Analysis/Differential Thermal Gravimetry) dan XRD (X-Ray Diffraction). AbstractMn oxide has long been known having a large magneto resistance properties. In order to study the physical properties of the electron, high quality of single crystal is required. (La, Sr), Superkonduktor, Kristal tunggal, DTA/DTG1 + nMnnO3n +1 (n = 2) which has two layers of Mn-O, has the largest magneto resistance properties in comparison with group n = 1, and n = ∞. In this research, manufacturing of pellet rod that will be used as a raw material for growing single crystal is studied. Then, pellet rod product is analyzed by using DTA/DTG (Differential Thermal Analysis/Differential Thermal Gravimetry) dan XRD (X-Ray Diffraction).

Sintesis Kalium Magnesium Posfat Melalui Metoda Mekanokimia untuk Aplikasi sebagai Pupuk Slow Release[MECHANOCHEMICAL SYNTHESIS OF POTASSIUM MAGNESIUM PHOSPHATE FOR APPLICATION AS SLOW RELEASE FERTILIZER MATERIAL[Mechanochemical Synthesis of Potassium Magnesium Phosphate for Application as Slow Release Fertilizer Material] Solihin Solihin
Metalurgi Vol 28, No 1 (2013): Metalurgi Vol.28 No.1 April 2013
Publisher : National Research and Innovation Agency (BRIN)

SINTESIS KALIUM MAGNESIUM POSFAT MELALUI METODA MEKANOKIMIA UNTUKAPLIKASI SEBAGAI PUPUK SLOW RELEASE.. Material yang bersifat slow release dapat digunakansebagai pupuk slow release, yakni jenis baru dimana pelepasan elemennya dapat diturunkan. Salah satu pupukslow release adalah potassium magnesium phosphate (KMgPO4). Analisa XRD terhadap material inimenunjukan bahwa kemurnian material ini cukup tinggi, hanya fasa KMgPO4 yang dapat dideteksi dalamsampel material ini. Analysis FTIR menunjukan bahwa teknik mekanokimia cukup berhasil untuk mensintesamaterial in. Analisa DTA menunjukan bahwa material ini stabil dari perubahan temperatur. Analisa morfologimenunjukan bahwa partikel yang tergranulasi memiliki ukuran sekitar 100 mikron. Dibanding dengan pupukbiasa yang nutriennya cepat larut, nutrien yang terlarut dari pupuk jenis slow release dapat diturunkan menjadisekitar 32-33, 22-24, and 0,1-0,7 %, untuk masing-masing potassium, phosphate and magnesium. Hasil ujileaching menunjukan bahwa material ini dapat digolongkan sebagai material yang bersifat slow release.

PENGARUH SOLUTION ANNEALING DAN AGING PADA KAWAT PADUAN SHAPE MEMORY Ni-Ti DAN Ni-Ti-Cu[The Influence of Solution Annealing and Aging on Ni-Ti and Ni-Ti-Cu Shape Memory Alloy Wire] Efendi Mabruri; Bambang Sriyono; Bintang Adjiantoro; DN Adnyana
Metalurgi Vol 27, No 2 (2012): Metalurgi Vol. 27 No. 2 Agustus 2012
Publisher : National Research and Innovation Agency (BRIN)

PENGARUH PENAMBAHAN MULTIWALLED KARBON NANOTUBE PADA SIFAT MAGNET BAHAN KOMPOSIT Fe0,8-C0,2[Effect of Magnetic Properties in the Addition of Multiwalled Carbon Nanotube to Material Composite Fe0,8- C0,2] Mashadi Mashadi; Setyo Purwanto
Metalurgi Vol 27, No 3 (2012): Metalurgi Vol.27 No.3 Desember 2012
Publisher : National Research and Innovation Agency (BRIN)

Pengaruh Waktu Milling Terhadap Mikrostruktur dan Sifat Magnetik Komposit NiFe2O4-NdFeO3 [Influence Of Milling Time on Microstructure and Magnetic Properties of NiFe2O4-NdFeO3 Composite] Ade Mulyawan; Yunasfi Yunasfi; Wisnu Ari Adi
Metalurgi Vol 32, No 3 (2017): Metalurgi Vol. 32 No. 3 Desember 2017
Publisher : National Research and Innovation Agency (BRIN)

The development of electromagnetic wave and microwave absorbing materials was important to overcome the electromagnetic wave interference in communication technology and in the development of radar materials for military purposes. In this study the composite which contained two different phases of NiFe2O4-NdFeO3 has successfully synthesized using Fe2O3, NiO, and Nd2O3 as starting materials through solid state reaction method. The composites were made by varying milling times from 10, 15, 20, and 25 hours then followed by sintering process at 1200 °C for 3 hours. Phase identification was performed using XRD (x-ray diffractometer) which revealed only NiFe2O4 and NdFeO3 phases. The crystallite size of the NiFe2O4 phase is in the range of 59-68 nm, and NdFeO3in the range of 62-65 nm. The agglomeration of particles was observed by using SEM (scanning electron microscope). Referring to the characterization result of the magnetic properties by using VSM (vibrating sample magnetometer), it is known that the parameters of the magnetic properties such as magnetization saturation (Ms), magnetization remanence (Mr), and coercivity (Hc) are highly dependent on the mass fraction, crystallite size,and the homogenity of the phase composition.AbstrakPengembangan bahan penyerap gelombang elektromagnetik dan gelombang mikro sangat penting dilakukan untuk mengatasi masalah interferensi gelombang elektromagnetik pada teknologi komunikasi serta pada material radar untuk tujuan militer. Pada penelitian ini berhasil dilakukan pembuatan material penyerap gelombang elektromagnetik komposit fasa NiFe2O4-NdFeO3 dengan menggunakan Fe2O3, NiO, dan Nd2O3 melalui reaksi padatan. Sampel komposit dimilling dengan variasi waktu 10, 15, 20, dan 25 jam dan selanjutnya disinter pada suhu 1200 oC selama 3 jam. Identifikasi fasa dilakukan dengan X-ray Diffractometer (XRD) menunjukan bahwa komposit hanya terdiri dari fasa NiFe2O4 dan NdFeO3. Ukuran kristalit fasa NiFe2O4 berada pada kisaran 59-68 nm, sedangkan fasa NdFeO3 pada kisaran 62-65 nm. Pengamatan morfologi permukaan dilakukan menggunakan Scanning Electron Microscope (SEM). Berdasarkan nilai parameter sifat magnetik yang dihasilkan menggunakan Vibrating Sample Magnetometer (VSM) seperti magnetisasi saturasi(Ms), magnetisasi remanen (Mr), dan koesivitas (Hc) sangat bergantung pada fraksi massa, ukuran kristalit, dan homogenitas fasa yang terbentuk.

THE EFFECT OF HEAT TREATMENT AND SURFACE ANODIZATION ON FRICTION AND WEAR COEFFICIENT OF ALUMINIUM 2024 USING PIN ON DISK METHOD Tiya Khairina Izzati; Aristo Nugraha Putra; Budi Hartono Setiamarga; Yorinah Sarah Francoise Lantang
Metalurgi Vol 37, No 1 (2022): Metalurgi Vol. 37 No. 1 April 2022
Publisher : National Research and Innovation Agency (BRIN)

The use of aluminum alloys as a material for engineering components that rub against each other is increasing, so it is important to know the friction characteristics of these aluminum alloys. In this study, Aluminum 2024 was given heat treatment with variation in aging time and anodization. Then, the wear and friction coefficient tests were carried out using a pin tool on the disc. The effect of aging time and surface anodization on wear tests are carried out to determine the amount of wear and the coefficient of friction test is carried out to determine the coefficient of friction of the material when it rubs against a pin made of AISI 52100 Steel. The coefficient of friction test is carried out by adding lubrication as a parameter. The test results showed that the aluminum material given heat treatment had better resistance than that which was not heat treated. This is because the heat treatment creates precipitates that can increase the aluminum's hardness and wear resistance. Whereas for anodized specimens, the alumina layer can act as an abrasive grain when given a high enough friction and load continuously, so the wear testing mode changes from dry sliding wear to three body abrasive wear and decreased wear resistance. From the friction coefficient test results, the aging time affects the hardness of the aluminum alloy, which leads to the value of the coefficient of friction. The harder the sample surface, the smaller the coefficient of friction obtained. Furthermore, applying lubricant to the sample will also decrease the value of the friction coefficient of the sample. Lubricating oil will provide a more significant reduction in friction coefficient than air. Finally, the anodizing surface on the sample will act as a lubricant reservoir when it occurs.

EFFECT OF MULTI PASS HIGH ENERGY MILLING ON MORPHOLOGY AND RHEOLOGICAL PROPERTIES OF CARBON NANOTUBES Nono Darsono
Metalurgi Vol 29, No 2 (2014): Metalurgi Vol.29 No.2 Agustus 2014
Publisher : National Research and Innovation Agency (BRIN)

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