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All Journal Jurnal Spektra Jurnal Informatika Universitas Pamulang Jurnal Ilmu Fisika Makara Journal of Technology
Abu Khalid Rivai
Pusat Sains dan Teknologi Bahan Maju, BATAN
Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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STUDI AWAL DEPOSISI LAPISAN TIPIS YTTRIA-STABILIZED ZIRCONIA (YSZ) PADA SUBSTRAT BAJA FERITIK DENGAN METODE PLD - PULSED LASER DEPOSITION Agusutrisno, Agusutrisno; Suharyadi, Edi; Mardiyanto, Mardiyanto; Rivai, Abu Khalid
Jurnal Spektra Vol 16, No 1 (2015): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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Abstract

AbstrakStudi awal lapisan tipis Yttria-Stabilized Zirconia (YSZ) telah berhasil dideposisi di atas substrat baja feritik dengan teknik Pulsed Laser Deposition (PLD) di fasilitas laboratorium Pusat Sains dan Teknologi Bahan Maju - BATAN. Lapisan tipis ini dideposisi dengan tekanan chamber dalam rentang 200 mTorr hingga 225 mTorr dengan temperatur substrat pada temperatur ruang serta pulsa tembakan laser adalah 30×1000 tembakan dengan frekuensi 10 Hz. Selanjutnya sampel yang diperoleh dianalisis dengan Optical Microscope (OM), X-Ray Diffractometer (XRD), Raman Spectrometer dan Atomic Force Microscope (AFM). Sebagai bahan perbandingan sampel tersebut dipanaskan (annealing) pada temperatur 800oC kemudian dikarakterisasi dengan metode yang sama. Hasil analisis secara visual maupun dengan OM serta AFM menunjukkan bahwa lapisan YSZ telah terdeposisi di atas permukaan substrat baik sebelum dipanaskan maupun setelah dipanaskan. Karakterisasi struktur kristal sampel menggunakan X-ray Diffraction (XRD) menunjukkan bahwa derajat kristalinitas lapisan tipis YSZ masih rendah baik dengan substrat dipanaskan maupun tanpa dipanaskan. Karakterisasi Raman Spectroscopy menunjukkan bahwa pada deposisi dengan temperatur ruang belum tampak dengan jelas ikatan dan fasa YSZ. Sedangkan pada sampel dengan substrat dipanaskan menghasilkan puncak pada 550 cm-1 yang menunjukkan bahwa lapisan cenderung amorf. Karakterisasi topografi permukaaan menggunakan AFM menunjukkan bahwa sampel yang dideposisi menggunakan teknik PLD menghasilkan surface roughness yang sangat halus dalam rentang nano-meter sehingga berpotensi digunakan sebagai aplikasi Thermal Barrier Coating (TBC) pada material temperatur tinggi.Kata kunci: Lapisan tipis, Yttria-Stabilized Zirconia (YSZ), Pulsed Laser deposition (PLD), baja, nano-meter AbstractPRELIMINARY STUDY OF A YTTRIA-STABILIZED ZIRCONIA (YSZ) THIN FILM DEPOSITION ON A FERRITIC STEEL SUBSTRATE USING PLD - PULSED LASER DEPOSITION METHOD. A thin film of Ytrria-Stabilized Zirconia has been deposited on a ferritic stainless steel by Pulsed Laser Deposition (PLD) at laboratory facilities of Center For Science and Technology of Advanced Materials-BATAN. The thin film was deposited with the chamber pressure range of 200 mTorr to 225 mTorr, substrate temperature at room temperature, and 30x1000 shots of pulsed-laser with 10 Hz of frequency. Afterward, the sample was analyzed using Optical Microscope (OM), X-Ray Diffractometer (XRD), Raman Spectrometer and Atomic Force Microscope (AFM). As for comparison analysis, the sample was annealed at 800oC then characterized using the same methods. The result of analyses with visually and using OM then AFM showed that the thin film of YSZ was deposited on the surface of the substrate. The characterization of the crystal structure of the sample by using XRD showed that the crystallinity degree of thin film with the substrate both with and without annealing was still low. Raman spectroscopy characterization showed that the bond and phase of YSZ deposition with the substrate at room temperature were not clearly formed. Whereas the sample was annealed resulted peak at 550 cm-1, which is showed that the thin film was still amorphous. Surface topography characterization using AFM showed that the surface roughness of the sample deposited by PLD method was relatively smooth in the range of nano-meter.Keywords: Thin film, Yttria-Stabilized Zirconia (YSZ), Pulsed Laser Deposition (PLD), steel, nano-me
Pengaruh Penggunaan Teknik Blending Dan Kompaksi Terhadap Morfologi Komposit Polimer UHMWPE-Na2B4O7.5H2O Sebagai Bahan Perisai Radiasi Neutron Termal Bery, Winda Surya; Fitriyani, Dian; Elvaswer, Elvaswer; Zavianti, Enny; Mardiyanto, Mardiyanto; Rivai, Abu Khalid; Sukaryo, Sulistioso Giat
Jurnal Ilmu Fisika Vol 8, No 2 (2016): JURNAL ILMU FISIKA
Publisher : Jurnal Ilmu Fisika

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (426.009 KB) | DOI: 10.25077/jif.8.2.98-103.2016

Abstract

Telah dilakukan pembuatan dan karakterisasi komposit polimer UHMWPE dengan filler Na2B4O7.5H2O sebagai bahan perisai radiasi neutron termal.  Pembuatan bahan dilakukan dengan menggabungkan UHMWPE dan Na2B4O7.5H2O menggunakan metode blending untuk menghasilkan komposit yang homogen, dan proses kompaksi untuk meminimalkan jarak antar partikel penyusun bahan.  Persentase penambahan Na2B4O7.5H2O yang digunakan bervariasi dari 0% hingga 52%. Bahan dasar dan filler di-blending pada suhu 165°C selama 15 menit, selanjutnya dikompaksi dengan pembebanan 10 ton.  Hasil analisis EDS menunjukkan persentase massa filler di permukaan bahan meningkat dengan penambahan Na2B4O7.5H2O hingga konsentrasi 40% dan menurun di 52%.  Hasil karakterisasi SEM menunjukkan persentase filler optimum pada 40%.  Dengan demikian metode blending dan kompaksi sesuai digunakan untuk mencampurkan UHMWPE dan Na2B4O7.5H2O menjadi bahan perisai neutron termal dengan perbandingan komposisi (60:40)%. Kata kunci :  Perisai radiasi, neutron termal, UHMWPE, Na2B4O7.5H2O, filler, blending, kompaksi 
Karakterisasi Bahan Perisai Radiasi Neutron Ultra High Molecular Weight Polyethyene Dengan Filler Gd2O3 Menggunakan Teknik Radiografi Neutron Zarvianti, Enny; Fitriyani, Dian; Elvaswer, Elvaswer; Bery, Winda Surya; Rivai, Abu Khalid; Mardiyanto, Mardiyanto; G.S, Sulistioso
Jurnal Ilmu Fisika Vol 9, No 1 (2017): Published in March 2017
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (109.949 KB) | DOI: 10.25077/jif.9.1.1-6.2017

Abstract

Radiasi merupakan pancaran energi melalui suatu materi atau ruang dalam bentuk energi, panas, partikel atau gelombang yang dapat diserap oleh bahan lain. Beberapa radiasi dapat mengionisasi bahan yang dilaluinya salah satunya radiasi neutron karena memiliki daya tembus yang tinggi sehingga sangat diperlukan perisai radiasi. Adapun kriteria dari perisai radiasi neutron harus memiliki kandungan hidrogen yang tinggi, memiliki nilai tampang lintang yang baik dan tidak bersifat korosi. Bahan UHMWPE (Ultra High Molecular Weight Polyethyene) memiliki kandungan hidrogen yang tinggi dan tidak mudah korosi dan bahan Gadolinium oxide (Gd2O3) sangat baik menyerap neutron karena mempunyai tampang lintang serapan neutron yang tinggi. Berdasarkan hal tersebut maka dibuat komposit UHMWPE-Gd2O3 dengan tujuan dapat meningkatkan nilai serapan neutron sehingga dalam aplikasinya bisa lebih efektif untuk memperlambat bahkan menahan radiasi neutron. Telah dilakukan karakterisasi bahan perisai radiasi neutron yang dibuat sendiri dengan teknik radiografi neutron. Bahan perisai radiasi dibuat dengan bahan utama UHMWPE dan penambahan filler Gadolinium Oxide (Gd2O3) dengan kompoisisi 70% : 30% massa menggunakan metode blending dan kompaksi. Bahan dibuat dengan ketebalan yang bervariasi dari 0,5 cm hingga 2 cm. Hasil karakterisasi XRD menunjukkan tidak terbentuk senyawa kimia antara kedua bahan dan karakterisasi menggunakan SEM terlihat hasil distribusi unsur yang terkandung dalam filler Gd2O3 merata pada bahan dasar polimer. Pengujian serapan neutron menggunakan teknik radiografi neutron dengan metode film. Dengan penambahan variasi ketebalan meningkatkan daya serap bahan dari 58,78% menjadi 67,89% dan nilai koefisien atenuasi diperoleh sebesar 1,025.Kata kunci: perisai radiasi, UHMWPE,Gd2O3, radiografi neutron, daya serap dan koefisien  atenuasi.
Analisis Perencanaan Produksi Mebel Menggunakan Perangkat Lunak Berbasis Fuzzy Linear Programming serta Pengujian Akurasi Hasil Menggunakan Data Training dan Data Testing Mardiansyah, Mardiansyah; Rivai, Abu Khalid; Kurnia, Dadang
Jurnal Informatika Universitas Pamulang Vol 6, No 2 (2021): JURNAL INFORMATIKA UNIVERSITAS PAMULANG
Publisher : Teknik Informatika Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/informatika.v6i2.9114

Abstract

For the management of raw material supply problems and optimization of the production process, appropriate methods are needed, fuzzy linear programming algorithm is the right model to provide recommendations related to production forecasting problems. The results of the prediction of ideal production potential provide recommendations for the optimal profit that will be obtained if selling 10 kitchen set products, 10 work tables and 10 wardrobes, with this sale the company will get an income of Rp. 154,500,000. Forecasting results have been tested using training data and testing data, the recommendations given by the system have an accuracy of 97.8%.
High Temperature Corrosion of Aluminized AISI 4130 Steel with the Different Composition of NaCl/Na2SO4 Deposits Badaruddin, Mohammad; Wang, Chaur Jeng; Saputra, Yudhistyra; Rivai, Abu Khalid
Makara Journal of Technology Vol. 19, No. 2
Publisher : UI Scholars Hub

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Abstract

The high temperature corrosion of AISI 4130 steel can be increased by hot-dip aluminizing coating. The aluminized steel specimens with the deposit composition of 100/0, 30/70, 50/50, 70/30, and 0/100 (wt.%) NaCl/Na2SO4 were oxidized at 750 °C for 1-49 h periods. According to a parabolic rate constant (kp) value, the aluminized steel with deposit composition of 70/30 NaCl/Na2SO4 shows the highest kp value (3.71 × 10-11 g2cm- 4s-1), later followed by the kp value of 3.35 × 10-11 g2cm-4s-1 for 100/0 and the lowest kp value is 7.731 × 10-12 g2cm-4s-1 for 0/100. Whereas, the kp value for the aluminized steel without NaCl/Na2SO4 deposit is around 2.23 × 10-13 g2cm-4s-1. The presence of both salts and their mixtures destroyed protective Al2O3 layer on the aluminized steel, leading to the Fe2O3 growth locally. Whereas, the penetration of sulfur into the Al2O3 scale lead to the formation of Al2S3 and FeS in the aluminide coating. Therefore, the kinetics rate was increased. Furthermore, mixtures of 70 wt. % NaCl in Na2SO4 depositing on the aluminized steel produced the highest parabolic rate constant because the aluminide layer on the steel substrate experienced severe corrosion attack, leading to fail in formation of protective Al2O3 layer.
Nano-Channels Early Formation Investigation on Stainless Steel 316Ti after Immersion in Molten Pb-Bi Rivai, Abu Khalid; Mardiyanto, Mardiyanto; Heinzel, Annette
Makara Journal of Technology Vol. 21, No. 1
Publisher : UI Scholars Hub

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Abstract

Development of fuel cladding and structural materials in Pb-Bi environment, especially at high temperature, is a critical issue for the deployment of LFR (Lead alloy-cooled Fast Reactor) and ADS (Accelerator Driven Transmutation System). This is because of the corrosive characteristic of Pb-Bi to metals as constituent materials of fuel cladding and structural of the reactors. Corrosion test of a high-chromium austenitic stainless steel i.e. SS316Ti in molten Pb-Bi at 550 ºC has been carried out for about 300 hours continuously. The characterization using SEM-EDS (Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy) showed that an iron oxide as the outer layer and a chromium oxide as the inner layer on the surface of the specimen were formed which in general have protected the steel specimen from corrosion and dissolution attack of Pb-Bi. However, small amount of Pb could penetrate into the iron oxide layer through ultra-narrow channels. Atomic Force Microscopy (AFM) with Electrostatic Force Microscopy (EFM) mode was employed to investigate the phenomena of the nano-channels early formation. The results of the nano-scale investigation showed clearly the formation of the channels at the early time of corrosion as the way of Pb to penetrate into iron oxide outer layer.
Microstructures and Hardness of TIG Welded Experimental 57Fe15Cr25Ni Steel Parikin, Parikin; Dani, Mohammad; Rivai, Abu Khalid; Ismoyo, Agus Hadi; Iskandar, Riza; Dimyati, Arbi
Makara Journal of Technology Vol. 22, No. 2
Publisher : UI Scholars Hub

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Abstract

The microstructures and hardness of tungsten inert gas (TIG) welded experimental 57Fe15Cr25Ni steel were investigated through optical–scanning electron microscopy analyses and with a hardness tester, respectively. The welding process restructured the constituent atoms into regular and irregular crystal lattices. Rapid cooling of the weld metal allowed the formation of a dendritic (columnar) structure, with porous grains. By contrast, slow cooling influenced HAZ and led to the formation of grain structures. The crystal lattice became more organized and larger than other zones. Meanwhile, the base metal formed circular nets that covered large area inside thick and thin grain boundaries. The diffraction patterns revealed texturing in the weld metal. The crystallite orientation changed from (111) to (200) and (220) planes. The weld metal profile broadened (amorphous) and had full width at half maximum (fwhm) value larger than those in HAZ and the base metal. The weld metal possessed hardness of 121 HV, which is slightly lower than the hardness of the base metal (130 HV). HAZ exhibited the highest hardness value (152 HV). Hardening was influenced by carbon and outer oxygen migration to the grain boundaries, which formed colonies, i.e., chromium carbide, aluminum carbide, aluminum oxide, silicone oxide, and silicon carbide (precipitation hardening). Welding (heat) may change the microstructure and hardness of HAZ and the weld metal region, which would be brittle and very critical in responding to applied loads.
Co-Authors Agus Hadi Ismoyo Agusutrisno Agusutrisno, Agusutrisno Annette Heinzel Arbi Dimyati Bery, Winda Surya Chaur Jeng Wang, Chaur Jeng Dadang Kurnia, Dadang Dian Fitriyani Edi Suharyadi Elvaswer Elvaswer Mardiansyah Mardiyanto Mardiyanto Mohammad Dani Parikin Parikin Riza Iskandar Sulistioso G.S, Sulistioso Sulistioso Giat Sukaryo, Sulistioso Giat Yudhistyra Saputra, Yudhistyra Zarvianti, Enny Zavianti, Enny