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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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KONTRIBUSI ADITIF SUCCINONITRILE (SN) PADA PERFORMA ELEKTROLIT PADAT LIBOB UNTUK BATERAI LI-ION qolby sabrina; Titik Lestariningsih; Christin Rina Ratri; Latifa Hanum Lalasari
Metalurgi Vol 35, No 2 (2020): Metalurgi Vol. 35 No. 2 Agustus 2020
Publisher : National Research and Innovation Agency (BRIN)

Pengembangan elektrolit polimer padat untuk substitusi elektolit cair bertujuan untuk mengurangi kebocoran pada sistem baterai. Performa elektrolit polimer padat masih terus ditingkatkan agar memiliki konduktifitas ionik sebanding dengan performa elektrolit cair. Salah satu upaya peningkatan performa elektrolit polimer padat dengan menambahkan Succinonitrile (SN). SN merupakan matriks serbaguna untuk menghantarkan Li-ion dalam elektrolit padat, tingginya polaritas SN diharapkan dapat membantu pemisahan ion lithium yang berasal dari garam elektrolit LiBOB. Peningkatan mobilitas ion akan menghasilkan konduktifitas ion yang tinggi. Penambahan Jumlah SN dalam pembuatan elektrolit padat dibuat bervariasi dengan metode mixing slurry dan solution casting. Hasil karakterisasi FESEM dan XRD dengan penambahan SN 32% memperlihatkan adanya lubang pori dan mempunyai bentuk struktur amorf, hal ini akan memudahkan ion lithium untuk berpindah secara merata. Hasil pengujian TGA/DSC menunjukkan elektrolit polimer padat akan mengalami kestabilan sampai pada temperatur 117oC dengan kehilangan berat sebesar 25,1% dan nilai derajad kristalinitas adalah paling kecil. Penambahan SN 32% menunjukkan jendela tegangan stabilitas elektrokimia 2.2 volt cukup lebar dari hasil karakterisasi Linier Sweep Voltammetry. Pengukuran konduktifitas ionik dilakukan menggunakan EIS, hasilnya memperlihatkan nilai konduktifitas elektrolit polimer padat dengan penambahan SN 32% sebesar 6,711x10-8 S/cm, masih lebih kecil bila dibandingkan dengan kisaran nilai konduktifitas elektrolit cair. Optimasi jumlah penambahan SN pada elektrolit padat masih harus dilakukan untuk mencapai performa baterai yang lebih baik.

Studi Kinetika Pelindian Bijih Nikel Limonit Dari Pulau Halmahera Dalam Larutan Asam Nitrat [Kinetics Study of Nickel Limonite Ore Leaching from Halmahera Island in Nitric Acid Solution] Mohammad Zaki Mubarok; Muhammad Wildanil Fathoni
Metalurgi Vol 31, No 1 (2016): Metalurgi Vol. 31 No. 1 April 2016
Publisher : National Research and Innovation Agency (BRIN)

One of the recent developments in the extraction of nickel from laterite ore by hydrometallurgical route is to use leaching reagent which can be regenerated, such as hydrochloric and nitric acids. Although the success of leaching of laterite ore has been reported, leaching kinetics study of laterite ore in nitric acid is stillpoorly published. In this paper, the results of leaching kinetics analysis of nickel laterite ore of limonite type from Halmahera Island in nitric acid solution at atmospheric pressure is discussed. The purposes of the kinetics study are to determine rate-determining step, kinetic parameters (i.e. reaction rate constant or diffusion coefficient), activation energy and the kinetics model. Leaching kinetics was studied by adopting shrinking core models (SCM). The analysis results reveal that the leaching rate of Halmahera limonite ore from Halmahera Island in nitric acid is controlled by diffusion through solid layer product with effective diffusion coefficient (De) of 2,1- 8,55 x 10-10 m2/s at the temperature range of 65-95 °C and activation energy of 46.78kJ/mol.AbstrakSalah satu perkembangan terkini proses ekstraksi nikel dari bijih laterit dengan jalur hidrometalurgi adalah dengan menggunakan reagen pelindi yang dapat diregenerasi, seperti asam klorida dan asam nitrat. Meskipun keberhasilan proses pelindian bijih nikel laterit dalam asam nitrat telah dipublikasikan, studi kinetika pelindian bijih nikel laterit dalam asam nitrat masih terbatas. Dalam paper ini dipresentasikan hasil analisis kinetika pelindian bijih nikel laterit tipe limonit dari Pulau Halmahera dalam larutan asam nitrat pada tekanan atmosfer. Studi kinetika pelindian bertujuan untuk mengetahui pengendali laju reaksi, parameter kinetika (konstanta laju reaksi atau koefisien difusi), energi aktivasi reaksi dan persamaan kinetikanya. Kinetika pelindian dipelajari dengan menggunakan model shrinking core (SCM). Hasil analisis menunjukkan bahwa pengendali laju reaksi pada pelindian bijih limonit dari Pulau Halmahera dalam larutan asam nitrat adalah difusi melalui lapisan produk padat yang tidak/belum bereaksi dengan koefisien difusi efektif (De) sebesar 2,1- 8,55 x 10-10 m2/s pada rentang suhu 65-95oC serta energi aktivasi sebesar 46,78 kJ/mol.

Synthesis of Tin Oxide Nanocrystallites with Various Calcination Temperatures Using Co-Precipitation Method with Local Tin Chloride Precursor Panthoko, Norbert Egan Christo; Septiningrum, Fairuz; Yuwono, Akhmad Herman; Nurhidayah, Eka; Maulana, Fakhri Akbar; Sofyan, Nofrijon; Dhaneswara, Donanta; Lalasari, Latifa Hanum; Arini, Tri; Andriyah, Lia; Firdiyono, Florentinus; Ardianto, Yahya Winda; Pawan, Ria Wardhani
Metalurgi Vol 38, No 1 (2023): Metalurgi Vol. 38 No. 1 2023
Publisher : National Research and Innovation Agency (BRIN)

Indonesia is one of the largest tin metal producers in the world, and one of its derivative products is tin chloride (SnCl4). This material has been used as a raw ingredient for the production of organotin compounds such as methyltin mercaptide for PVC (polyvinyl chloride) plastic industry as a heat stabilizer. On the other hand, this precursor can be used to synthesize SnO2 nanomaterials, which have other strategic potentials, including photocatalysts and solar cell applications. In this study, the synthesis of SnO2 nanocrystallites was carried out using a local tin chloride precursor via the co-precipitation method, followed by a calcination process at temperatures of 300, 400, 500, and 600 °C, for further usage as an ETL (electron transport layer) in a PSC (perovskite solar cell) device. The basic properties characterization was carried out using XRD (X-ray diffraction), ultraviolet-visible (UV-Vis) spectroscopy, and SEM (scanning electron microscopy), while the photocurrent-voltage (I-V) curve photovoltaic performance of the device was performed using a semiconductor parameter analyzer. The characterization results showed that increasing the calcination temperature from 300 to 600 °C increased the average crystallite size from 1.19 to 13.75 nm and decreased the band gap energy from 3.57 to 3.10 eV. The highest PCE (power conversion efficiency) was obtained from the device fabricated with SnO2 nanocrystallites calcined at a temperature of 300 °C, which was 0.0024%. This result was obtained due to the highest transmittance of this sample as compared to others; the higher the transmittance, the better the performance of the ETL, which in turn increased the overall efficiency of the PSC

Liquid Metal Embrittlement (LME) Akibat Kontaminasi Tembaga Pada Pipa Baja Api 5L x70 Dengan Pengelasan Busur Rendam[Liquid Metal Embrittlement (LME) Caused By Copper Contamination On Api 5l X 70 Steel Processed By Submerged Arc Welding (SAW)] budi priyono surbia
Metalurgi Vol 30, No 2 (2015): Metalurgi Vol.30 No.2 Agustus 2015
Publisher : National Research and Innovation Agency (BRIN)

Dalam studi ini, telah dilakukan penelitian terhadap kegagalan berupa penetrasi logam tembaga ke dalam logam lasan jenis baja karbon paduan rendah (C-Mn-Mo) yang menyebabkan retak pada proses pembuatan pipa dengan pengelasan busur rendam atau SAW (submerged arc welding). Kegagalan tersebut dikenal sebagai liquid metal embrittlement (LME). Dalam penelitian ini, kegagalan LME disebabkan oleh kualitas lapisan tembaga, dimana LME ditandai dengan adanya bercak merah pada permukaan logam lasan. Mekanisme kegagalan LME yang telah dipelajari dalam penelitian ini adalah lapisan tembaga pada elektroda teroksidasi membentuk senyawa CuO, terbawa ke dalam logam cair, dan muncul ke permukaan logam lasan. Senyawa CuO tersebut kemudian tereduksi kembali oleh terak menjadi logam Cu dalam kondisi cair. Pada kondisi inilah akan terjadi penetrasi logam tembaga ke dalam logam lasan melalui batas butir yang dikenal dengan nama liquid metal embrittlement (LME). Dari hasil penelitian, kegagalan LME dalam penelitian ini lebih disebabkan oleh kualitas lapisan elekroda las yang terlampau kuat, seharusnya lapisan tembaga lepas atau pecah sebelum masuk ke dalam busur lasan dan terperangkap dalam terak cair sebagai pengotor. AbstractIn this study, we conducted a study of failures in the form of copper metal penetration into the metal weldslow-alloy carbon steel (C-Mn-Mo) which caused cracking in the process of making pipe with submerged arcwelding or SAW (submerged arc welding). Such failures are known as liquid metal embrittlement (LME). Inthis study, the failure is caused by the quality LME copper layer, where LME characterized by red spot onthe surface of the weld metal. LME failure mechanisms that have been studied in this research is a copperlayer on the electrode is oxidized to form CuO compounds, brought into the molten metal, and surface weldmetal. CuO compounds are then reduced again by the slag to metallic Cu in a liquid state. In this conditionwill occur metallic copper penetration into the weld metal through the grain boundaries which are known asliquid metal embrittlement (LME). From the research, LME failure in this study was due to the strong effectof the welding electrodes coating, the copper layer should be separated or broken before entering into an arcwelds and trapped in the molten slag as an impurity.

Perlakuan Panas Ganda pada Fabrikasi Film Tipis AZO Nanokristal dengan Teknik Spray : Studi XRD [Double Heat Treatments On The Fabrication Of Nanocrystalline Azo Thin Films By Spray Technique: XRD Studies] Didik Aryanto; Naimatul Husniya; Toto Sudiro; Ema Hastuti
Metalurgi Vol 32, No 2 (2017): Metalurgi Vol. 32 No. 2 Agustus 2017
Publisher : National Research and Innovation Agency (BRIN)

XRD characterization was used to study the effect of single and double thermal treatment on the fabrication of nanocrystalline Al-doped ZnO (AZO) thin films deposited by spray technique. In the single thermal treatment, nanocrystalline AZO thin film with a wurtzite hexagonal polycrystalline structure was formed at temperatures of 500 °C and 600 °C. An increasing of treatment temperature led to the increase of crystalline size and the decrease of dislocation density. The double thermal treatment on nanocrystalline AZO thin films resulted in a small change in diffraction pattern. This indicated that the crystal parameters of nanocrystalline AZO thin films changed after receiving a second thermal treatment. Nanocrystalline AZO thin films which was thermal treatment at temperatures of 500 °C in air environment and continued at temperatures of 600 °C in vacuum showed that the decrease of average crystal size and the presence of crystal defect (an increase of strain and dislocation). Different results were shown in the nanocrystalline AZO thin film after thermal treatment attemperatures of 600 °C in air environment then followed by vacuum condition. The crystal quality of nanocrystalline AZO thin films was improved, which was indicated by an increase of the average crystal size and reduce of the strain value and dislocation density. Based on the obtainedresults, the double heat treatment effected the crystal parameter and the quality of nanocrystalline AZO thin films deposited by spray technique.AbstrakKarakterisasi XRD telah digunakan untuk mempelajari efek perlakuan panas tunggal dan ganda pada fabrikasi film tipis ZnO doping Al (AZO) nanokristal yang dideposisikan dengan teknik spray. Pada perlakuan panas tunggal, film tipis AZO nanokristal dengan struktur polikristal heksagonal wurtzite terbentuk pada suhu 500 °C dan 600 °C. Peningkatan suhu menyebabkan peningkatan ukuran kristal dan pengurangan kerapatan dislokasi. Perlakuan panas ganda pada film tipis AZO nanokristal mengakibatkan perubahan kecil pola difraksi. Hal ini mengindikasikan bahwa parameter kristal film tipis AZO nanokristal berubah setelah mendapat perlakuan panas kedua. Film tipis AZO nanokristal yang diberikan perlakuan panas pada suhu 500 °C dalam lingkungan udara dan dilanjutkan hingga suhu 600 °C dalam kondisi vakum memperlihatkan bahwa rata-rata ukuran kristal berkurang dan muncul cacat kristal (regangan dan kerapatan dislokasi meningkat). Hasil yang berbeda ditunjukkan pada film tipis AZO nanokristal yang diberikan perlakuan panas pada suhu 600 °C dalam lingkungan udara kemudian dilanjutkan dengan suasana vakum. Kualitas kristal film tipis AZO nanokristal meningkat, yang diindikasikan dengan peningkatan rata-rata ukuran kristal, berkurangnya nilai regangan dan kerapatan dislokasi. Berdasarkan pada hasil yang didapat, perlakuan panas ganda berpengaruh pada parameter dan kualitas kristal film tipis AZO nanokristal yang dideposisikan dengan teknik spray.

cover, daftar isi, abstrak vol 36 Agustus 2021 Lia Andriyah
Metalurgi Vol 36, No 2 (2021): Metalurgi Vol. 36 No. 2 Agustus 2021
Publisher : National Research and Innovation Agency (BRIN)

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PENGARUH PENAMBAHAN MOLIBDENUM TERHADAP MORFOLOGI STRUKTUR MIKRO, SIFAT MEKANIK DAN KETAHANAN KOROSI PADUAN Zr-Nb UNTUK MATERIAL IMPLAN Sulistioso Giat Sukaryo; B Badriyana; Pius Sebleku
Metalurgi Vol 29, No 1 (2014): Metalurgi Vol.29 No.1 April 2014
Publisher : National Research and Innovation Agency (BRIN)

cover, daftar isi, abstrak vol 35 April 2020 Lia Andriyah
Metalurgi Vol 35, No 1 (2020): Metalurgi Vol. 35 No. 1 April 2020
Publisher : National Research and Innovation Agency (BRIN)

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ANALISA KERUSAKAN PIPA EKSPAN PADA KETEL UAP UNIT PENGOLAHAN MINYAK BUMI[Failure Analysis of Tube Expand in Oil Processing Unit Boiler System] Eka Febriyanti
Metalurgi Vol 27, No 3 (2012): Metalurgi Vol.27 No.3 Desember 2012
Publisher : National Research and Innovation Agency (BRIN)

Studi Inhibitor Korosi Berbasis Imidazoline Salt Pada Brine Water Di Pipa Penyalur Minyak Mentah [Studies of Imidazoline Salt Inhibitor for Brine Water in Crude Oil Pipeline] Lutviasari Nuraini; Gadang Priyotomo; Ronald Nasoetion; Harsisto Harsisto
Metalurgi Vol 31, No 2 (2016): Metalurgi Vol. 31 No. 2 Agustus 2016
Publisher : National Research and Innovation Agency (BRIN)

A study of imidazoline salt inhibitor for brine water in crude oil pipeline was carried out using tafel polarization test, Fourier Transform Infrared Spectroscopy (FTIR) and Electrochemical Impedance Spectroscopy (EIS). A type of specimen used in this research is API 5L grade B. The solution of brine water came from fluid in crude oil pipeline. The addition of commercial inhibitor of imidazoline salt base was conducted with range of 3-40 ppm for polarization test and range of 3-20 ppm for EIS test. The addition of imidazoline salt at 3-20 ppm is effective to decrease corrosion rate and to increase inhibitor efficiency up to 95% . The resistance of adsorbed molecule layer increase with the addition of inhibitor compared without inhibitor, where this addition could decrease the electrochemical reaction on the surface. The decrease of corrosion rate took place due to the presence of adsorbed thin layer in metal surface.AbstrakStudi kinerja inhibitor imidazoline salt pada brine water di pipa penyalur minyak mentah dilakukandengan melakukan pengujian tafel, Fourier Transform Infrared Spectroscopy (FTIR) dan Electrochemical Impedance Spectroscopy (EIS). Jenis spesimen uji baja yang digunakan dalam penelitian adalah API 5L dan larutan brine water berasal dari 70% dari total fluida di pipa penyalur minyak mentah. Penambahan inhibitor komersial berbasis imidazoline salt dilakukan dengan variasi 3 - 40 ppm untuk pengujian polarisasi dan variasi 3 - 20 ppm untuk pengujian EIS. Penambahan inhibitor berbasis imidazoline salt antara 3 – 20 ppm secara efektif dapat menurunkan nilai laju korosi dan meningkatkan efisiensi inhibitor hingga 95%. Tahanan lapisan adsorpsi molekul dengan penambahan inhibitor meningkat dibandingkan kondisi tanpa inhibitor, dimana hal ini dapat menurunkan aktifitas reaksi elektrokimia di permukaan baja. Penurunan laju korosi terjadi dikarenakan pembentukan lapisan tipis yang teradsopsi di permukaan logam.

Page 23 of 29 | Total Record : 287

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