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All Journal Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir Metalurgi Indonesian Journal of Material Research
Bonita Dilasari
Department Of Metallurgical Engineering, Faculty Of Mining And Petroleum Engineering, Institut Teknologi Bandung, Bandung, 40132, Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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EFFECT OF Al, Zr AND Mo ON CORROSION RESISTANCE OF AlXCrFeNiMo AND AlXCrFeNiZr (X=1, 1.2 AND 1.4) AS FUEL CLADDING MATERIALS Teguh Firmansyah; Bonita Dilasari; Jan Setiawan; Djoko Hadi Prajitno
Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol 28, No 1 (2022): Februari, 2022
Publisher : website

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2022.28.1.6624

Abstract

EFFECT OF Al, Zr AND Mo ON CORROSION RESISTANCE OF AlXCrFeNiMo AND AlXCrFeNiZr (X=1, 1.2 AND 1.4) AS FUEL CLADDING MATERIALS. The high entropy alloy of AlxCrFeNiM (with x = 1, 1,2 and 1,4; M = Mo and Zr) was successfully synthesized using powder metallurgy technique with sintering process at 1000 oC in an inert atmosphere. These alloys were designated as fuel cladding for research reactor with high U-density fuel such as U-Mo. One of the critical in-service properties of nuclear fuel cladding is its corrosion behavior. In this study, some properties of the HEA of AlxCrFeNiM such as the phases, microstructures, hardness, and corrosion resistance in 3 wt.% NaCl solution at room temperature were investigated. The results show that the phases in the HEA of AlxCrFeNiMo are FeNi, AlNi and Mo. The HEA of AlxCrFeNiZr has more complex phases compared to the AlxCrFeNiMo. The microstructure of HEA samples show  fine grains with some micropores that imperfect the solidification during the sintering process. The hardness value of the HEA of AlxCrFeNiMo has a trend of decreasing as the x value increases. The opposite trend occurs to the HEA of AlxCrFeNiZr that the hardness value increases with increasing x value. The lowest hardness value is Al1.4CrFeNiMo at 262.2 HV, and the highest hardness value of Al1.4CrFeNiZr is at 756.7 HV. The corrosion rate of the AlxCrFeNiMo does not show a specific trend with increasing x value; however,  the AlxCrFeNiZr shows decreasing value with increasing x value. The lowest value for the all-HEA samples is 0.20 mmpy for the Al1.4CrFeNiZr. The results of hardness and corrosion tests show that the Zr element combined with the Al element affects not only its hardness but also its corrosion resistance.Keywords: Fuel cladding, high entropy alloy, corrosion
HARDNESS AND CORROSION BEHAVIOR OF Ti-20Cu-20Ni-20Mn- 20Zn AS HIGH ENTROPY ALLOY AND TI-13Cu-9Ni-5Mn-5Zn FOR MARINE STRUCTURE APPLICATION Muhammad Azhar Ariefkha Dani; Bonita Dilasari; Yudi Nugraha Thaha; Ika Kartika; Fendy Rokhmanto
Metalurgi Vol 37, No 2 (2022): Metalurgi Vol. 37 No. 2 Agustus 2022
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (978.363 KB) | DOI: 10.14203/metalurgi.v37i2.636

Abstract

An aneurysm clip is an implant tool for assisting the neurosurgeon in treating acute hemorrhagic stroke and cerebral aneurysm. This equipment stops the blood flow of a ruptured or enlarged blood vessel or aneurysm. In the development of aneurysm clip production, titanium alloy is the most used material selection. Several researchers reported that this metal leads to artifacts during MR (magnetic resonance) or CT (computed tomography) imaging. Since several pieces of evidence polyurethane could be a good material selection for aneurysm clips, this paper aims to investigate the material properties of the polyurethane foam with an additional combination of magnesium and zinc. This study conducts magnesium and zinc composition variations of 1 wt.%, 2 wt.%, and 3 wt.%, respectively. The materials were tested using a compression test, a FTIR (fourier-transform-infrared), SEM (scanning-electron-microscope), DSC (differential-scanning-calorimetry), and TGA (thermogravimetric-analyzer) to determine the material properties. From all examinations, adding magnesium and zinc to polyurethane foam affected the compressive strength and porosity of the polyurethane foam. Therefore, all test results concluded that adding magnesium with a composition of 3wt.%, which has a compressive strength of 0.84 MPa, is the best mixture. The idea of finding other compositions that are compatible with the polyurethane will significantly increase the possibility of new materials for aneurysm clip construction.
The Effect of Titanium Nanostructure on Corrosion Resistance as Dental Implants: A Review Fadhli Muhammad; Shintia Novia Sari; Bonita Dilasari
Indonesian Journal of Material Research Vol. 2 No. 1 (2024): March
Publisher : Magister Program of Material Science Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijmr.20242121

Abstract

Titanium is widely recognized as the most biocompatible metal due to the inert passive oxide layer that forms spontaneously on its surface. However, dental implants made of titanium and its alloys remain susceptible to corrosion when exposed to saliva for extended periods in the oral environment. Additionally, the presence of alloying elements in the alloy may raise concerns about potential toxicity concerns upon release into the human body. Consequently, there is an increasing need for research aimed at improving the mechanical properties and biocompatibility of dental implants made from both commercially pure titanium (CP Ti) and Ti alloys. This article provides a review of recent publications that investigate the impact of grain size reduction on ultrafine-grained and nanocrystalline CP Ti and Ti alloys. The article explores the modification of the oxide layer to nanotube TiO2 and its influence on corrosion resistance. The analysis of accumulated data provides a comprehensive understanding of the mechanisms underlying corrosion resistance improvement, offering valuable insights into the crucial directions for future research in this field.
Pengaruh Penambahan Nd2O3 dan Fe2O3 Pada Sistem Elektrolit Padat Gadolinia Doped Ceria (GDC) Untuk Aplikasi Sel Bahan Bakar Oksida Padat Suhu Menengah [Effect of Nd2O3 and Fe2O3 Addition on Gadolinia Doped Ceria (GDC) Solid Electrolyte System For IT-SOFC] Akbar, Muhammad Faisal; Dilasari, Bonita; Soepriyanto, Syoni; Suhendar, Dadan
Metalurgi Vol 37, No 2 (2022): Metalurgi Vol. 37 No. 2 Agustus 2022
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (701.104 KB) | DOI: 10.14203/metalurgi.v37i2.641

Abstract

Gadolinia Doped Ceria (GDC) is a solid electrolyte contender for intermediate-temperature SOFCs. However, more development of this solid electrolyte is required to improve its ionic conductivity. As a result, we will investigate the effect of Nd2O3 and Fe2O3 addition on GDC solid electrolytes to boost ionic conductivity. Solid electrolytes of the composition Ce0.9Gd0.2MxO1.9 (M = Nd, Fe) (x = 0%, 2,5% , 5%, and 7.5%) were synthesized using mixed oxide method and formed into pellets with a diameter of 1 cm. The pellets were sintered at 1200oC and 1400oC for 4 hours in an argon environment then the EIS test was performed at 450-650oC. The results showed that the Nd2O3 and Fe2O3 added were totally dissolved in the ceria structure and produced single-phase cubic fluorite CeO2. GDC solid electrolyte with Fe2O3 addition produces higher densification than Nd2O3 addition, where the value reaches 75% in the sample sintered at 1400oC. However, the addition of Nd2O3 further increased the value of ionic conductivity and decreased the activation energy of the GDC solid electrolyte compared to the addition of Fe2O3. The highest ionic conductivity and the lowest activation energy were obtained in the sample with 2.5% Nd2O3 in 650oC operating temperature, with the values achieved were 1.2 mS/cm and 0.41 eV, respectively. Therefore, it can be concluded that Nd2O3 addition is more effective to improve the performance of solid electrolyte GDC.AbstrakGadolinia Doped Ceria (GDC) merupakan kandidat elektrolit padat yang dapat dipakai pada sel bahan bakar oksida padat suhu menengah. Namun masih diperlukan pengembangan dari elektrolit padat ini untuk meningkatkan konduktivitas ioniknya. Oleh karena itu, pada penelitian ini dipelajari pengaruh penambahan Nd2O3 dan Fe2O3 untuk peningkatan konduktivitas ionik elektrolit padat GDC. Elektrolit padat disintesis menggunakan metode pencampuran oksida dengan komposisi Ce0,9Gd0,2MxO1,9 (M = Nd, Fe) (x = 0,2,5%, 5% dan 7,5%) dan dibuat dalam bentuk pelet dengan diameter 1 cm. Pelet yang dihasilkan dilakukan sintering pada 1200oC dan 1400oC selama 4 jam dalam atmosfer argon kemudian dilakukan pengujian EIS pada temperatur 450-650oC.  Hasil penelitian menunjukkan bahwa Nd2O3 dan Fe2O3 yang ditambahkan akan larut sempurna dalam struktur ceria dan fasa yang dihasilkan adalah cubic flourite fasa tunggal CeO2. Elektrolit padat GDC dengan penambahan Fe2O3 akan menghasilkan densifikasi lebih tinggi dibanding dengan penambahan Nd2O3 dimana nilainya mencapai 75% pada sampel yang disinter pada 1400oC. Akan tetapi, penambahan Nd2O3 lebih meningkatkan nilai konduktivitas ionik dan menurunkan energi aktivasi dari elektrolit padat GDC dibanding dengan penambahan Fe2O3. Konduktivitas ionik tertinggi dan energi aktivasi terendah didapat pada sampel dengan penambahan Nd2O3 2,5% dengan nilai yang dicapai berturut-turut 1,2 mS/cm dan 0,41 eV. Oleh karena itu, dapat disimpulkan bahwa Nd2O3 merupakan bahan yang lebih efektif untuk meningkatkan performa dari elektrolit padat GDC.
Co-Authors Djoko Hadi Prajitno Fadhli Muhammad Faisal Akbar, Muhammad Fendy Rokhmanto Ika Kartika Jan Setiawan Muhammad Azhar Ariefkha Dani Shintia Novia Sari Suhendar, Dadan Syoni Soepriyanto Teguh Firmansyah Yudi Nugraha Thaha