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INDONESIA
Jurnal Metalurgi dan Material Indonesia
Published by Badan Kerjasama Pendidikan Metalurgi dan Material
ISSN : 26544962     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Chemistry Engineering Industrial & Manufacturing Engineering
Jurnal Metalurgi dan Material Indonesia (JMMI) merupakan terbitan berkala makalah ilmiah mencakup keilmuan teknik metalurgi (metallurgy) dan teknik material (materials science and engineering). JMMI diterbitkan oleh Badan Kerja Sama Pendidikan Metalurgi dan Material Indonesia (BKPMM) per catur wulan yaitu pada bulan akhir April, Agustus, dan Desember.
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 42 Documents
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Pengaruh Penambahan Aluminium Oksida Terhadap Kekerasan dan Struktur Mikro Paduan Mg-Sn Ayuda Darmawan Yulianto; Muhammad Reza Parega; Kusharjanto Suhirman; Supono Adi Dwiwanto
Jurnal Metalurgi dan Material Indonesia Vol. 1 No. 2 (2018): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

This paper focused on hardness and microstructure of Mg-Sn alloy by Aluminium Oxide addition. Mg-Sn alloys were prepared by casting with the addition of Aluminium Oxide from 1% to 5%wt, then quenching to the water. The microstructure evolution and hardness were investigated. Based on hardness test result the hardness was increased. With 1% to 5% Aluminium Oxide addition, hardness increased from 22.9 BHN to 30.8 BHN. The highest hardness was in the addition of 5% Aluminium Oxide with 30.8 BHN. The result showed that increasing of Aluminium Oxide content resulted the globular and smaller grains.
Observasi Nanofluid dengan TiO2 sebagai Partikel Nano dan Sodium Dodecyl Benzene Sulfonate sebagai Surfaktan untuk Aplikasi Media Quench Andreas Sugiarto; Aldi Alfarizi; Luthfi Dali Ahmad; Setyoaji Fajar Negara; Ghiska Ramahdita; Sri Harjanto; Wahyuaji Narottama putra
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 2 (2019): Agustus
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Heating and cooling process in heat treatment is a common process to increase the mechanical properties of steel component. Rapid cooling, or quenching, is needed to change the microstructure to obtain the desire hardness. Recently, nanofluid is widely used as a medium for quenching because of their advantage in heat thermal conductivity compared with conventional medium such as water or oil. Nanofluid is a liquid with high thermal conductivity nanoparticle suspended in the fluid base. The variation of nanoparticles content in nanofluids could control the cooling rate to optimize the desired characteristics of a material. TiO2 is widely used as nanoparticle because of its high thermal conductiviy, relatively cheap and environmental friendly. To improve the suspension of TiO2 nanoparticle in nanofluid, surfactant is added. In this research, Commercial grade TiO2 powder was used as nanoparticle, and common household bodycare which contain Sodium Dodecyl Benzene Sulfonate (SDBS) was used as the source of surfactant. The nanofluid was produced by mixing 100 ml water with 0.1% volume TiO2, and additional 1%, 3%, and 5% SDBS surfactant as variation. Before mixing, the TiO2 powder were milled at 500 rpm for 10 hours. This nanofluid was then used as quenching medium. The steel used as sample in this experiment was S45C medium carbon steel, heated at 1000°C for 1 hour. Scanning Electron Microscope (SEM) was used to determine the TiO2 particle size after milling, and showed roughly less than 100 nm. Microstructure observation showed martensite phase formation after quenching. Hardness test confirmed this phase, showing hardness up to 954 HV after quenching using surfactant added nanofluid.
Inspeksi Korosi Sambungan Las FGHAZ-CGHAZ Menggunakan Metode Magnetic Flux Leakage pada Pipa Penyalur Gas Ekha Panji Syuryana; Kusharjanto Suhirman
Jurnal Metalurgi dan Material Indonesia Vol. 1 No. 2 (2018): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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The welded joints are important factors that have an influence on the integrity of the pipeline. The microstructure differences in FGHAZ (fine grain heat affected zone) and CGHAZ (coarse grain heat affected zone) may potentially lead to micro galvanic corrosion reactions. Corrosion resistance to the weld section needs to be analyzed by ICDA (internal corrosion direct assessment), ECDA (external corrosion direct assessment) and In-line Inspection (ILI) type MFL (magnetic flux leakage) to mapping the condition of corrosion damage to pipelines on external and internal surfaces. Based on MFL inspection result in gas pipe case study with 28 in x 55 km, 0.500 in wall thickness, API 5L X65 indication of damage to weld joints at kilometer point 13 + 2216, defect orientation at 7:43 h, with 25% depth, axial length 116 mm, 67mm circular width and point kilometer 13 + 2219 defect orientation at 8:22, with a depth of 30%, axial length of 77 mm, 40 mm circular width. This pipeline supplies gas with 98.837% methane and 0.107% CO2 impurities
Pengaruh Temperatur Proses Curing Terhadap Sifat Thermal Komposit Epoksi Berpengisi Nanopartikel Sn-3.5Ag Tri Partuti; Yanyan Dwiyanti; Adhitya Trenggono; Fuji Utari
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 1 (2019): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Electrically Conductive Adhesive (ECA) is an alternative solder substitute that does not contain Pb. In this research, we made nanocomposite from epoxy resin as matrix and Sn-3.5Ag nanoparticle as filler to determine the nanocomposite thermal properties for ECA applications. We used curing process temperature variations of 30, 65 and 95 oC with sonication for 30 minutes. Differential Scanning Calorimetry (DSC) analysis showed an increase of glass transition temperature (Tg) and degradation temperature (Td), decreasing curing temperature (Tcuring) as the curing process temperature increased while the melting temperature (Tm) and crystallization temperature (Tc) tend to be constant. Tg for curing process 30, 65 and 95 oC was 35.58; 37.41 and 43.77 oC respectively. Td for curing process 30, 65 and 95 oC was 335.01; 337.50 and 342.49 oC. Tcuring in the curing process 30 and 65 oC was 179.95 and 176.08 oC. Thermogravimetric Analysis (TGA) showed that nanocomposite Td between 330-340 oC.
Pengaruh Komposisi Cairan Additif Terhadap Kuat Tekan Dan Daya Infiltrasi dalam Pengembangan Pervious Paving Block Ramah Lingkungan Afrian Wira Wardhana; Amirin Kusmiran; Andy Tirta
Jurnal Metalurgi dan Material Indonesia Vol. 1 No. 2 (2018): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Analysis of compressive strength and infiltration pervious paving was performed by falling head method at 7, 14, and 28 days with variation of additive composition by 70 ml, 140 ml, 210 ml, and 280 ml. The addition of lignosulfonat acid additive in the pervious paving making mixture affects the mechanical properties of pervious paving such as compressive strength, permeability and cement bonding time. The results showed the most significant increase in compressive strength occurred during baseline time. Addition of lignosulfonat acid additive affects the acceleration of hydration power of cement up to 2.6 times of normal binding time. Pervious paving infiltration test results showed that the higher content of additive contained, the smaller the permeability. So we get the optimum composition of 140 ml additive substances with a compressive strength of 19.4 MPa and permeability of 0.367 cm / sec.
Effect of Hydroxyapatite on Microstructure and Hardness of Mg-Al-Zn Alloy Andy Saputro; Intan Khoerunisa; Kusharjanto Suhirman; Supono Adi Dwiwanto
Jurnal Metalurgi dan Material Indonesia Vol. 1 No. 2 (2018): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

This paper focused on microstructure and hardness of Mg-Al-Zn alloy by Hydroxyapatite addition. Mg-Al-Zn alloys were prepared by casting with the addition of Hydroxyapatite from 1,5% to 2,5%wt, then water quenched. The microstructure evolution and hardness were investigated. The result showed that increasing of Hydroxyapatite content made the globular and smaller grains. Based on hardness test result the hardness was increased. With 1,5% to 2,5% Hydroxyapatite addition, hardness increased from 75.52 HV to 82.82 HV. The highest hardness was in the addition of 2.5% Hydroxyapatite with 82.82 HV.
Studi pengaruh temperatur dan konsentrasi ion klorida terhadap korosi sumuran dan Critical Pitting Temperature material UNS S31603 Bambang Widyanto; Catia Julie Aulia
Jurnal Metalurgi dan Material Indonesia Vol. 1 No. 2 (2018): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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This experiment simulates a pitting corrosion on UNS S31603 with a variation of temperature and concentration of chloride ions through immersion testing based on ASTM G48 Method E to determine Critical Pitting Temperature. Solution containing FeCl3.6H2O, HCl 37%, and reagent water was used. The tests carried out at temperatures 10oC, 20oC, 25oC, 30oC, and 35oC with variation of chloride ion concentration; 2M; 2.25M; and 2.5M. The immersion test was performed for 24 hours for each specimen with stirring speed 300 rpm. The test results show that the temperature and concentration of chloride ions influence the formation of pitting on UNS S31603 specimens. An increment in temperature will accelerate the reaction rate so the number of pit increases. An increment in the concentration of chloride ions accelerate the dissolution of passive layer on the specimen’s surface, beside increase of the number of pits and increase of depth, there is also other phenomenon where the pits gradually interconnected each other due to the adjacent pits position. The concentration of chloride ions would affect the Critical Pitting Temperature.
Pengaruh Penambahan Hydroxyapatite Terhadap Struktur Mikro dan Sifat Mekanik Paduan Mg-Al-Zn Melalui Proses Thixoforming Andy Saputro; Intan Khoerunisa; Kusharjanto Suhirman; Supono Adi Dwiwanto
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 2 (2019): Agustus
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Magnesium alloys are lightweight metallic materials with low mechanical properties. Therefore, in an effort to meet the application requirements for orthopedic implants, the mechanical properties such hardness and tensile strength of Mg-Al-Zn shall be improved. The purpose of this research is to investigate the effect of adding hydroxyapatite (HA) particle to changes in microstructure, hardness and mechanical properties regarding with ultimate strength. HA is a potential compound to be a suitable candidate for applied to orthopedic implants. And thixoforming process is a potential process to be a grain refiner (globular) so as to improvethe mechanical properties magnesium alloy.in this research, the molten Mg-Al-Zn alloy is added HA with a various range of 1.5, 2, 2.5 wt% and then water quenched. Futhermore, Mg-Al-Zn-HA is heated at 530°C (semi-soid temperature) and then thixoforming process is performed. The characterization result as cast showed that increasing of HA content made the smaller dendritic structure. And the result of thixoforming product showed the microstructure is globular grains with maximum hardness value of 86,33 VHN in 2.5% HA and the maximum ultimate tensile strength value of 328.63 MPa in 2% HA with hardness value of 83.42 VHN lower than 2.5% HA alloy. This is due to the presence of porosity in the 2.5% HA alloy with porosity area 4.66 mm2.
Pengembangan Teknologi Investment Casting Untuk Pembuatan Produk Cor Substitusi Impor Dengan Pemanfaatan Bahan Baku Lokal Hafid Abdullah; Sri Bimo Pratomo
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 1 (2019): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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The development of investment casting technology for the manufacture of import substitution casting products by using of local raw materials has been done. Compared to the conventional casting process, investment casting has the advantage of being able to create a complex casting product and produce a product that is near net shape so that it is no need machining process. The objective is as an effort to find an alternative method of making a quality casting product, has high added value with the utilization of local raw materials available in Indonesia so as to reduce the cost of production and dependence on imports of industrial raw materials which are very expensive in the investment casting process. The method of making casting products with investment casting process, including: pattern making, mould making, dewaxing, melting, pouring, finishing and testing. Investment casting technology has been successfully applied to the manufacture of rocker arm, impeller pump and turbine blade with the utilization of local raw materials ie: epoxy resin as a substitute for metal pattern, mixture wax of paraffin and celo resin for the pattern of wax and zircon sand of Bangka as coating slurry for ceramic mould. The discussion of this paper is expected to be a case of developing other casting products needed by Indonesia for industry: medical equipment, agricultural equipment, textile equipment, gun and small armaments, electronics, automotive and electrical components etc.
Pengaruh Variasi Konsentrasi CN- Pada Proses Pelindian Bijih Au Terhadap Recovery Au, Gangue Ag, Cu dan Fe Sutarno Sutarno; Andri Kabarubun; Iskandar Muda; R.M Ario Adisaputro
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 2 (2019): Agustus
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Gold is a precious metal, valuable, and widely found in Indonesia. Gold metal applications can be found in the jewelry, medical, catalyst and high-tech industries. In this study 35 mm of gold ore with a level of 15.6 ppm was extracted using NaCN as a lixiviant. The leaching process parameters included variations in 200, 300, and 400 ppm CN- concentrations, 48 hour leaching time and lixiviant pH in the range of 10-11. To increase the extraction rate was added Pb(NO3)2 catalyst and 15 ppm oxygen. Characterization results with AAS obtained the highest gold recovery was 88.46% Au at CN-300 ppm concentration, leaching time of 8 hours. In addition to gold metal, other metals are also found as gangue such as Ag, Cu and Fe.

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