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All Journal Jurnal Teknik ITS Jurnal Sains Materi Indonesia Rekayasa Mesin Power Plant Energi & Kelistrikan Metalurgi Journal of Electronics, Electromedical Engineering, and Medical Informatics Metalurgi
Andika Widya Pramono
FTBE IT PLN
Automotive Engineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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PERCOBAAN PEMBUATAN FASA INTERMETALIK Nb3Sn DENGAN PROSES SINTERING LOGAM NIOBIUM (Nb) DAN TIMAH (Sn) Firdiyono, Florentinus; Pramono, Andika Widya; Sebleku, Pius; Ciptasari, Nurhayati Indah; Suryantoro, Anton
Metalurgi Vol 26, No 3 (2011): Metalurgi Vol. 26 No. 3 Desember 2011
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (632.387 KB) | DOI: 10.14203/metalurgi.v26i3.19

Abstract

Penentuan kondisi optimum meliputi waktu milling Nb dan Sn dengan HEM (High Energy Milling), perbandingan jumlah Nb dan Sn, waktu dan temperatur pemanasan campuran Nb dan Sn. Pengamatan karakterisasi Nb3Sn yang terbentuk dilakukan dengan  menggunakan DTA (Differential Thermal Analyzer), XRD ( X-Ray Diffraction), SEM (Scanning   Electron Microscope) dan EDS (Enegy Dispersive x-ray Spectroscopy). Analisis dengan menggunakan SEM dan XRD menunjukkan waktu minimum yang diperlukan untuk milling campuran Nb dan Sn adalah 3 jam, sedangkan hasil dari analisis DTA menunjukkan pembentukan Nb3Sn terjadi pada temperatur sekitar 700 °C. Analisis XRD terhadap campuran Nb dan Sn menunjukkan bahwa makin lama waktu pemanasan maka fasa intermetalik Nb3Sn yang terbentuk akan semakin banyak. Abstract Determination of optimum conditions include milling time of Nb and Sn with HEM, ratio of Nb and Sn, heating time and heating temperature of mixed Nb and Sn. Characterization of Nb3Sn produced from the process was performed using DTA, XRD, SEM and EDS. The results of SEM and XRD analysis showed the minimum time needed for milling Nb and Sn are 3 hours, and the result of DTA analysis showed the intermetalic phase of Nb3Sn was occured at the temparetuir around 700 °C. The result of XRD analysis for mixed Nb and Sn showed that by the increasing of heating time will produced more intermetalic phase of Nb3Sn.
Pendekatan Persamaan Ginzburg – Landau dalam Superkonduktifitas Tipe II[APPROXIMATION OF GINZBURG – LANDAU EQUATIONS IN TYPE II SUPERCONDUCTIVITY] Pramono, Andika Widya; Suryantoro, Anton
Metalurgi Vol 27, No 3 (2012): Metalurgi Vol.27 No.3 Desember 2012
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (636.529 KB) | DOI: 10.14203/metalurgi.v27i3.228

Abstract

PENDEKATAN PERSAMAAN GINZBURG – LANDAU DALAM SUPERKONDUKTIFITAS TIPE II.Makalah ini membahas tentang persamaan Ginzburg-Landau (GL) yang diaplikasikan pada materialsuperkonduktor tipe II. Untuk menyederhanakan situasi, mobilitas vorteks diminimalisir dengan melakukanpinning. Faktor pinning dimasukkan ke dalam persamaan GL. Dalam hal ini kondisi kesetimbangan pada teoriGL berhubungan dengan titik kritis pada fungsional energi-bebas Helmholtz. Model ini kemudian dijustifikasioleh teori mikroskopis Bardeen – Cooper – Schriefer (teori BCS), dengan memasukkan kerapatan lokal daripasangan elektron superkonduktif ”pasangan Cooper”. Untuk kondisi vorteks dinamis, teori yang dipakaimenggunakan pendekatan tipe-Schrödinger digabung dengan persamaan tipe-Maxwell yang melahirkan modelSchrödinger -Ginzburg-Landau (SGL) serta fungsional Ginzburg-Landau yang bergantung kepada waktu. Padaakhirnya, fenomena efek Meissner, di mana medan magnet dikeluarkan dari bahan superkonduktor, jugadiakomodasi ke dalam persamaan. AbstractThe Ginzburg-Landau (GL) equation is applied for the type II superconducting materials. To simplify thecomplex situation, the mobility of vortices is firstly reduced by pinning them. The pinning term is thenintroduced into the equation. An equilibrium state in GL theory corresponds to a critical point of theHelmholtz free-energy functional. The model has been justified by the microscopic theory of Bardeen –Cooper – Schrieffer (BCS theory), by introducing the local density of superconducting electron pairs, called“Cooper pairs”. For the dynamic condition of vortices, the theory uses Schrödinger-type dynamics for theorder parameter coupled to a Maxwell-type equation for the magnetic field potential leading to theSchrödinger -Ginzburg-Landau (SGL) model as well as time-dependent Ginzburg Landau (TDGL)functional. Finally the diagmagnetism of Meissner effect, of which the magnetic field is expelled from thesuperconductor, is also accommodated.
OVERVIEW OF DENSITY FUNCTIONAL THEORY FOR SUPERCONDUCTORS[Sekilas Tentang Teori Fungsional Kerapatan Elektron pada Superkonduktor] Pramono, Andika Widya; Suryantoro, Anton
Metalurgi Vol 27, No 2 (2012): Metalurgi Vol. 27 No. 2 Agustus 2012
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (609.796 KB) | DOI: 10.14203/metalurgi.v27i2.141

Abstract

 SEKILAS TENTANG TEORI FUNGSIONAL KERAPATAN ELEKTRON PADA SUPERKONDUKTOR. Teori fungsional kerapatan elektron atau density functional theory (DFT) digunakanuntuk menjelaskan interaksi elektron pada material superkonduktor. Makalah ini membahas aspek mendasaruntuk inisiasi penggunaan DFT, seperti aproksimasi kerapatan lokal atau local density approximation (LDA)serta transformasinya menjadi sistem yang bergantung terhadap waktu atau time dependent system (TDDFT) dankondisi superkonduktif atau superconducting state (SCDFT). Teorema Hamiltonian dan Kohn-Sahmdipergunakan untuk menghitung energi sistem yang berinteraksi maupun yang tidak berinteraksi. PersamaanSchrödinger yang independen terhadap waktu diselesaikan untuk mengetahui posisi elektron terisi maupun tidakterisi serta respon mereka terhadap pengaruh eksternal seperti medan optik. Pemodelan menghasilkan konstruksidari LDA superkonduktor.Kata kunci : Teori fungsional kerapatan elektron, Aproksimasi kerapatan lokal, Sistem Hamiltonian, TeoremaKohn-Sahm, Superkonduktor AbstractOVERVIEW OF DENSITY FUNCTIONAL THEORY FOR SUPERCONDUCTORS. The density functionaltheory (DFT) has been utilized to describe the electron interaction in superconducting materials. This paperdiscusses the fundamental aspects to begin with the DFT, including local density approximation (LDA) as wellas its necessary transformation into time dependent system (TDDFT) and superconducting state (SCDFT). TheHamiltonian and Kohn-Sahm theorems along with Helmann-Feymann theorem are utilized to yield the energy ofinteracting and non-interacting systems. The procedures begins with the utilization of time-independentSchrödinger equation which is solved for occupied and unoccupied states. The equation is also computedagainst linear and non-linear responses of the material system to the external forces such as optical field. Theresults indicate construction of an LDA for superconductors.Keywords : Density
ANALISA KERUSAKAN PADA ATAP ZINCOATING DI LINGKUNGAN ATMOSFER INDUSTRI[Damage Analysis of Zincoted Roof in the Industrial Atmospheric] Anwar, Moch Syaiful; Sutowo, Cahya; Pramono, Andika Widya; Priyono, Budi; Nasoetion, Ronald
Metalurgi Vol 27, No 3 (2012): Metalurgi Vol.27 No.3 Desember 2012
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (433.095 KB) | DOI: 10.14203/metalurgi.v27i3.232

Abstract

ANALISA KERUSAKAN PADA ATAP ZINCOATING DI LINGKUNGAN ATMOSFER INDUSTRI.Telah terjadi kerusakan pada atap salah satu pabrik di Kawasan Industri di Bekasi. Atap tersebut telahdilindungi oleh lapisan zinccoating. Namun, setelah pemakaian selama 16 bulan, atap tersebut telahmengalami kerusakan. Bentuk kerusakannya adalah deposit berwarna kecoklatan tebal dan tipis yangmenempel pada atap tersebut. Pada tulisan ini, analisa kerusakan yang dilakukan antara lain pemeriksaanvisual, SEM-EDAX, metalografi, uji kerapatan deposit, dan analisa laju korosi. Hasil menunjukkan bahwawarna kecoklatan yang menempel pada atap tersebut disebabkan karena adanya deposit besi oksida dariudara. Adanya deposit tersebut mengakibatkan terjadi korosi galvanik antara deposit besi oksida denganzinccoating. Laju korosi terbesar ditemukan pada atap dengan deposit warna kecoklatan tebal. AbstractThere has been damage to the roof of a factory in Industrial Area in Bekasi. The roof has been coated by azincoating. However, after 16 months of usage, the roof has been damaged. The form of damage is thick andthin brownish deposits that stick on the roof. In this paper, the analysis of the damage include visualinspection, SEM-EDAX, metallography, test of deposit density, and analysis of the corrosion rate. Theresults showed that the color brown that sticks to the roof caused by the deposit of iron oxide from the air.The existence of deposits resulted in galvanic corrosion between iron oxide deposit and zincoating layers.Greatest corrosion rate was found in the roof with a thick brownish deposits.
PRELIMINARY STUDY OF ELASTICITY ON BINARY ALLOY Pramono, Andika Widya; Suryantoro, Anton
Metalurgi Vol 26, No 3 (2011): Metalurgi Vol. 26 No. 3 Desember 2011
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (632.387 KB) | DOI: 10.14203/metalurgi.v26i3.18

Abstract

Apabila setiap komponen dari suatu campuran logam memiliki modulus elastisitas atau struktur kisi (lattice structures)  yang  berbeda,  efek  elastis  akan berpengaruh  pada laju  coarsening serta  morfologi  fasa  yang terbentuk.  Dalam hal  ini  efek  mekanis  yang ditimbulkan  oleh fenomena  elastisitas  ini  lebih  dominan dibandingkan dengan laju difusi dari proses coarsening. Efek elastis mekanis ini kemudian dapat berpengaruh kepada sifat mekanis dari campuran logam tersebut. Makalah ini menyajikan gambaran awal bagaimana efek elastisitas tersebut dapat dikaji dengan menggunakan pendekatan elemen hingga (finite element) melalui penggunaan persamaan Cahn-Hilliard  yang  dilanjutkan dengan Persamaan Parabola Orde  Keempat.  Model Cahn Hilliard dengan efek elastisitas dikembangkan berdasarkan persamaan energi bebas Ginzburg–Landau yang merupakan fungsi dari perbedaan konsentrasi. AbstractIf the components of the mixture have different elastic moduli or different lattice structures, elastic effects might influence the rate of coarsening and the morphology of the particles. In this case the aspect of quasi-static equilibrium for the mechanical part is more predominant than the diffusion mechanism. The resulting elastic effects have a pronounced impact on the evolving coarsening morphology and hence on the material properties. This paper tries to give preliminary consideration on how this elastic behavior is analyzed through finite element approximation using Cahn Hiliard Approach followed by Fourth Order Nonlinear Degenerate Parabolic Equation. Cahn–Hilliard model with elastic contributions is based on a Ginzburg–Landau free energy which is a functional in terms of the concentration difference.
Pengaruh Variasi Persentase Reduksi pada Proses Pengerolan Panas terhadap Sifat Mekanik dan Struktur Mikro Baja Laterit Paristiawan, Permana Andi; Puspasari, Vinda; Pramono, Andika Widya; Adjiantoro, Bintang
Jurnal Rekayasa Mesin Vol 11, No 2 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.02.16

Abstract

Lateritic ore is one of the raw materials for the steel industry. Lateritic ore processed into laterite steel has more advantages than steel in the market. It has better tensile strength, hardness, corrosion resistance, and welding properties. Lateritic steel is made by performing a casting process. This research aims to investigate the effect of reduction percentage on mechanical properties and microstructure of the lateritic steel after the hot rolling process. The specimens were heated to austenitization temperature at 10000C for 1 hour before the rolling process. The reduction percentage varies by 10%, 15%, and 20%. Hardness and impact test was conducted using a Rockwell Hardness and Charpy method. The microstructure was observed using an optical microscope. The results showed the optimum hardness of 58 HRC in a hot rolling sample with 20% reduction. The highest impact strength of 46 Joule and ductile fracture took place in this sample. The microstructure of this sample showed a bainitic phase causing lower hardness.
Surface Modification of Ti-6Al-4V Alloy By Anodization Technique at Low Potential to Produce Oxide Layer Franciska Pramuji Lestari; Yeni Rian Sari; Fendy Rokhmanto; Talitha Asmaria; Andika Widya Pramono
Journal of Electronics, Electromedical Engineering, and Medical Informatics Vol 2 No 3 (2020): October
Publisher : Department of Electromedical Engineering, POLTEKKES KEMENKES SURABAYA and IKATEMI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35882/jeeemi.v2i3.2

Abstract

Due to their excellent biocompatibility, titanium alloys are tremendously as implants used, since relatively low modulus, corrosion resistance, and good fatigue strength. The biocompatibility, comes from the formation of natural Titanium dioxide (TiO2) layer. Therefore, TiO2 layer growth surface alteration is frequently applied to improve biological, chemical , and mechanical properties. TiO2 nanostructures are obtained under self-organization conditions by electrochemical anodization of Ti-6Al-4V. Parameters of anodization such as anodization time, voltage and addition of thiourea were evaluated in the composition of the H3PO4+NH4F solution. The morphology and elements of the Ti alloys surface were analyzed by Scanning Electron Microscopy (SEM) and Energy-Dispersive Spectroscopy (EDS), whereas potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used to evaluate the TiO2 layer in corrosion resistance. The results showed that the anodized Ti-6Al-4V alloy E-corr imcreased as the anodization voltage increased. Titanium alloy anodized using 12 V during 2 hours with H3PO4 + NH4F without thiourea solution had the thickest of oxide layer and highest corrosion resistance. Higher applied voltages have been shown to increase the deposition rate and coating thickness. Addition of thiourea has a definite effect on the inhibition of oxide layer of titanium. In order to produce the optimum titanium surface, the required applied anodization voltage and addition of volume thiourea is necessary.
Analisis Orientation Distribution Function (ODF) Unsur Nb dan Senyawa Intermetalik Superkonduktor Nb3Sn Kholifatul Aniswatin; Doty Dewi Risanti; Andika Widya Pramono
Jurnal Teknik ITS Vol 2, No 2 (2013)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (687.512 KB) | DOI: 10.12962/j23373539.v2i2.3477

Abstract

Perkembangan tekstur pada bahan polikristal memngkinkan peningkatan sifat fisik bahan, diantaranya superkonduktivitas. Penelitian ini menggunakan pelet Nb-Sn hasil metalurgi serbuk dengan dan tanpa sintering. Sintering dilakukan pada temperatur 700 oC selama 96 jam. Tekstur Niobium (Nb) murni dan senyawa intermetalik Nb3Sn diperoleh dari hasil pengukuran menggunakan XRD Brüker D8 Advance Goniometer berupa data pole figure, invers pole figure dan orientation distribution function (ODF). Secara umum, melalui analisa pole figure, proses sintering mengakibatkan perubahan orientasi distribusi kristal dari orientasi simetris atau acak menjadi orientasi pada arah tertentu. Dari hasil analisa ODF, diperoleh bahwa terdapat kecenderungan orientasi pada arah tertentu akibat kompaksi uniaxial. Disamping itu, terjadi perubahan intensitas dan perubahan orientasi akibat proses sintering. Berdasarkan analisa ODF, diketahui bahwa Niobium memiliki komponen utama Brass S dan Copper dan komponen penunjang Cube dan Goss. Intensitas maksimal komponen utama tersebut beralih pada S, Brass, Copper saat dilakukan sintering. Sedangkan Nb3Sn memiliki komponen utama Copper, S, Brass dan komponen penunjang Cube dan Goss. Setelah sintering, intensitas maksimal beralih pada komponen Copper, Goss dan Brass dengan intensitas Copper menurun dari 50,4 menjadi 39,3 multiple of a random distribution (m.r.d).
EFFECT OF ANNEALING ON Cu-Nb-Sn SUPERCONDUCTING WIRE Agung Imaduddin; Bintoro Siswayanti; Andika Widya Pramono; Pius Sebleku; Hendrik Hendrik; Sigit Dwi Yudanto
Jurnal Sains Materi Indonesia Vol 16, No 3: APRIL 2015
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (202.41 KB) | DOI: 10.17146/jsmi.2015.16.3.4227

Abstract

EFFECT OF ANNEALING ON Cu-Nb-Sn SUPERCONDUCTING WIRE. The most common application of superconductors is done in the form of superconducting wire. Among the existing types of superconductors, Cu-Nb-Sn superconductors are the most widely used as a wire, producing a high magnetic field. But the critical temperature (TC) values of its superconductors are low enough so that the resulting magnetic field and its application fields are limited. In this study we investigated the effect of annealing treatment on the Cu-Nb-Sn superconducting wire. Note that the process of annealing on superconducting wire can increase the value of the critical temperature of 8K to 16K. The increase is predicted because of the forming of Nb3Sn compounds, and the Nb3Sn compound becomes more stable.Annealing processes were performed at temperatures ranging from 873K to 1173K as well as various annealing time from 32 hours to 120 hours. The superconductivity of the samples were analyzed using resistivity measurement by cryogenic system under low temperature condition. The annealing can be performed optimally at the temperature of 873K for 72 hours when TC reaches 16K. However, the purity of the conductivity properties obtained at the optimal annealing temperature at 723K for 72 hours.
Analisis Patah Lelah Pipa Cold Superheater Boiler PLTU 2 Banten – Labuan Andika Widya Pramono; Ari Yulianto
JURNAL POWERPLANT Vol 1 No 1 (2013): JURNAL POWER PLANT
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/powerplant.v1i1.787

Abstract

Boilers (Boiler) is a major component in the plant in which there are pipes steam boiler that serves to drain the water to be heated by the flame or hot gases to be steam. Boiler pipes are arranged into a single entity, starting from the steam drum, the combustion chamber (furnace / burner), superheater and economizer. The existing pipe in the boiler is a vital component, because the pipe is used as a container to drain the vapor or liquid throughout the existing system with high operating temperatures. It depends on the type of material engineering digunakan.Pipa boiler operating at high temperature and pressure in the long term is a problem that often occurs is in the form of leaks that resulted in the power plant should cease to operate as it did on 2 Banten Labuan power plant. Boiler pipe leakage at this plant occurs in areas of cold pipe boiler superheater in the form of fracture mechanics and surface defects due to the weld metal splashes. To overcome this, a boiler pipe to be analyzed by observing the microstructure, chemical composition analysis and micro hardness tester with Vickers method to determine the cause of the leak. In the sample cold pipe fracture failure occurs supeheater tired (fatigue failure) that is indicated on the beach mark (the beach) and striation. From the results shows that the chemical composition of the material cold pipe superheater in accordance with the standard specifications (ASTM A210 Grade C), so that failure and damage of all pipes that are not investigated due to the specifications of the material are not standardized.
Co-Authors Adjiantoro, Bintang Agung Imaduddin Alan Laksono Anton Suryantoro Anton Suryantoro Anton Suryantoro Anwar, Moch Syaiful Ari Yulianto Asep Tresna Lh Bintoro Siswayanti Budi Priyono Budi Priyono Cahya Sutowo Ciptasari, Nurhayati Indah Doty Dewi Risanti Fendy Rokhmanto Florentinus Firdiyono Florentinus Firdiyono Franciska Pramuji Lestari Gita Puspa Artiani Halim Rusjdi Hendrik Hendrik Indah Handayasari Kholifatul Aniswatin Maghfirah, Awan Moch Syaiful Anwar Nasoetion, Ronald Nurhayati Indah Ciptasari Paristiawan, Permana Andi Pius Sebleku Pius Sebleku Pius Sebleku Puspasari, Vinda Rivai, Rizky Ramadhani Ronald Nasoetion Satrio Herbirowo Sigit Dwi Yudanto Suryantoro, Anton Talitha Asmaria Tri Hardi Priyanto Wahyu Bawono Faathir Yeni Rian Sari