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INDONESIA
Jurnal Sains Materi Indonesia
Published by Badan Tenaga Nuklir Nasional
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Materials Science & Nanotechnology
Jurnal Sains Materi Indonesia (Indonesian Journal of Materials Science), diterbitkan oleh Pusat Teknologi Bahan Industri Nuklir - BATAN. Terbit pertama kali: Oktober 1999, frekuensi terbit: empat bulanan.
Arjuna Subject : -
Articles 7 Documents
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Search results for , issue "Vol 18, No 4: JULI 2017" : 7 Documents clear
PENGARUH SUHU DAN WAKTU PEMANASAN TERHADAP KARAKTERISTIK LAPISAN ELEKTROLES Ni-P PADA BAJA TAHAN KARAT MARTENSITIK SS 420 Bahtiar Nurhakim; Arini Nikitasari; Efendi Mabruri
Jurnal Sains Materi Indonesia Vol 18, No 4: JULI 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (279.127 KB) | DOI: 10.17146/jsmi.2017.18.4.4121

Abstract

ABSTRAK PENGARUH SUHU DAN WAKTU PEMANASAN TERHADAP KARAKTERISTIK LAPISAN ELEKTROLES Ni-P PADA BAJA TAHAN KARAT MARTENSITIK SS 420. Telah dilakukan pelapisan elektroles Nikel-Posfor (Ni-P) pada baja tahan karat martensitik SS 420 dengan berbagai variasi suhu dan waktu pemanasan. Karakteristik lapisan elektroles Ni-P yang terbentuk dianalisa untuk mengetahui pengaruh variasi suhu dan waktu pemanasan. Variasi suhu perlakuan panas yang digunakan yaitu 200oC, 300oC, 400oC, dan 500oC, sedangkan variasi waktu pemanasan yang digunakan antara lain 60 menit, 120 menit, dan 180 menit. Hasil yang diperoleh menunjukkan bahwa kenaikan suhu dan waktu pemanasan menyebabkan lapisan elektroles Ni-P yang terbentuk menjadi lebih seragam dan ketahanan material terhadap korosi juga semakin meningkat. Terjadi peningkatan kadar unsur Nikel dan Posfor dalam lapisan elektroles Ni-P dengan adanya perlakuan panas. Kadar unsur Nikel dan Posfor tertinggi pada suhu pemanasan 400oC dan waktu pemanasan selama 180 menit. Kata kunci: Elektroles,  Nikel-Posfor, Martensitik, Korosi ABSTRACT    EFFECT OF TEMPERATURE AND HEATING TIME ON THE COATING CHARACTERISTICS OF MARTENSITIC SS 420 ELECTROLESS Ni-P. Electroless nickel phosphorus (Ni-P) coating has been done in the martensitic stainless steel SS 420 with a variety of temperature and heating time. Electroless Ni-P coating characteristics formed was analyzed to determine the effect of variations in temperature and heating time. Variations in the temperature of the heat treatment used is 200oC, 300oC, 400oC and 500oC, while the variation of heating time is used, 60 minutes, 120 minutes and 180 minutes. The results obtained showed that the rise in temperature and heating time causes elektroles Ni-P coating formed becomes more uniform and material resistance to corrosion is also increasing. Increased levels of nickel and phosphorus elements in electroless coating of Ni-P with heat treatment. The highest nickel and phosphorus elements at 400oC heating temperature and 180 minute heating time. Keywords: Electroless, Nickel-Phosphor, Martensitic, Corrosion
KETAHANAN OKSIDASI BAJA SUPER AUSTENITIK 15%CR-25%NI PADA TEMPERATUR 850 °C Parikin Parikin; B. Sugeng; M. Dani; S.G. Sukaryo
Jurnal Sains Materi Indonesia Vol 18, No 4: JULI 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2017.18.4.4128

Abstract

ABSTRAKKetahanan Korosi Temperatur Tinggi Baja Super Austenitik 15%Cr-25%Ni Pada Temperatur 850 °C. Ketahanan korosi temperatur tinggi atau ketahanan oksidasi merupakan prasyarat penting bahan logam yang akan diterapkan dilingkungan operasi bertemperatur tinggi.  Pengujian ketahanan oksidasi baja super austenitik 15%Cr-25%Ni pada temperatur 850 °C selama 5 jam lebih telah dilaksanakan. Satu sampel as-cast sebagai acuan awal yang tidak diperlakukan panas dan dua (2) kelompok sampel (masing-masing 3 buah) disiapkan dalam eksperimen. Satu kelompok sampel as-cast setelah dipanaskan (pada 850 °C /5 jam lebih) dan didinginkan perlahan kemudian ditimbang. Satu kelompok sampel quench yang dilakukan penurunan cepat temperatur (dari 850 °C / 5 jam lebih) ke dalam air, kemudian ditimbang. Percobaan dilakukan selama 15 jam lebih pada masing-masing kelompok. Hasil memperlihatkan bahwa walaupun terjadi kenaikan berat sangat kecil pada sampel as-cast dan quench, tetapi foto morfologi mikroskop elektron (SEM) pada kedua sampel tersebut tidak memperlihatkan perubahan yang signifikan. Demikian pula hasil analisis fasa menggunakan difraksi sinar-X, tidak memperlihatkan pertumbuhan fasa produk oksidasi. Hasil  pengamatan struktur mikro permukaan bahan menggunakan mikroskop optik (MO), juga tidak memperlihatkan kerusakan dan perubahan ukuran butir oleh proses oksidasi. Kebolehjadian pada fenomena ini adalah selain pembentukan spinel unsur Ni diperkuat juga oleh kemampuan unsur Cr untuk membentuk lapisan pasif (Cr2O3) dipermukaan bahan yang sangat besar dengan mengikat unsur O, sehingga bahan mampu menanggulangi produk oksidasi yang sangat kecil. Disimpulkan bahwa baja super austenitik memiliki ketahanan oksidasi yang baik pada temperatur 850°C.ABSTRACT High Temperature Corrosion Resistance of Super Austenite 15%Cr-25%Ni Steel at Temperature 850 °C. High temperature corrosion resistance so called oxidation resistance is an important prerequisite of a metal material that may be applied in a high-temperature operating environment. An oxidation test of super austenite steel 15% Cr-25% Ni at 850 °C for more than 5 hours has been performed. One as-cast specimen as an initial reference is not treated any heat and two (2) specimen groups (each of 4 pieces) were prepared in the experiments. One group of as-cast specimens after being heated at 850 °C for more than 5 hours and cooled slowly then weighed. Another group of quench specimens performed a rapid decrease of temperature (850 °C for more than 5 hours) into water, then weighed. The experiment was conducted for more than 15 hours in each group. The results show that there is a very small slight increase in weight on as-cast and quench specimens. However, electron microscope morphology (SEM) images on both specimens showed no significant changes. Similarly, the results of phase analysis using X-ray diffraction techniques also do not show the phase growth of oxidation products. In accordance with the observation of surface microstructures of materials by using optical microscope (OM), also did not show damage and changes in grain size by oxidation process. The likelihood of this phenomenon is that in addition to the formation of Ni element of spinels, it is also strengthened by the ability of Cr-elements to form a passive layer (Cr2O3) on a very large material surface by binding O-elements, so that the material can cope with very small oxidation products. It is concluded that the super austenitic steels has good oxidation resistance at 850°C.
INVESTIGATION ON PRECIPITATIONS AND DEFECTS OFTHE Fe-24Cr-2Si-0.8Mn FERRITIC SUPER ALLOY STEEL Mohammad Dani; Parikin Parikin; R. Iskandar; A. Dimyati
Jurnal Sains Materi Indonesia Vol 18, No 4: JULI 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2017.18.4.4123

Abstract

Investigation on Precipitations and Defects of the Fe-24Cr-2Si-0.8Mn Ferritic Super Alloy Steel. A ferritic Fe-24Cr-2Si-0.8Mn alloy was produced from granular ferro-scrap, ferrochrome, ferrosilicon and ferromanganese in a conventional induction furnace. The alloy is dedicated for application as structure material in high temperature devices, such as nuclear reactor vessel and heat exchanger. The alloy has been verified to have high tensile strength and high resistant against corrosion. The aim of this work is to study the microstructures, chemical compositions and precipitation occurred inside grain and grain boundary of the alloy, to obtain more information of its superior physical-chemical properties. STEM-EDX mappings reveal the present of relatively large aluminum oxide, silicon carbide and high oxygen and high carbon containing precipitations on the specimens. The grains that were formed, exhibit relatively strong deformations as obviously shown by the elongated grains and sub-grains with typical high density of dislocations, even though, less mechanical treatments applied. Small porosities are also present homogeneously separated on the whole view area.
MAGNETIC REDUCED GRAPHENE OXIDE AS ADVANCED MATERIALS FOR ADSORPTION OF METAL IONS Andri Hardiansyah; Elsy Rahimi Chaldun; Amelia Fadyah Idzni
Jurnal Sains Materi Indonesia Vol 18, No 4: JULI 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (296.9 KB) | DOI: 10.17146/jsmi.2017.18.4.4119

Abstract

MAGNETIC REDUCED GRAPHENE OXIDE AS ADVANCED MATERIALS FOR ADSORPTION OF METAL IONS. Magnetite (Fe₃O4) Reduced Graphene Oxide (MRGO) is graphene-based material that modified by introducing of Fe₃O4 nanoparticles onto the surface of graphene oxide (GO). MRGO exhibit some unique and advanced properties and characteristic including high surface area, superparamagnetic characteristics and adsorption ability against ions and molecules. In this research, GO was prepared by the Hummers method, followed by reacting FeCl₂.4H₂O and FeCl₃.6H₂O through co-precipitation method for the formation of magnetite nanoparticles on the graphene surface. MRGO was prepared with various composition of ferrochloride tetrahydrate (FeCl₂.4H₂O). Furthermore, the resultant of MRGO was characterized by Scanning Electron Microscope (SEM), Fourier-transform Infrared (FTIR) Spectroscopy, X-ray diffraction (XRD) and Atomic Adsorption Spectroscopy (AAS). Adsorption characteristics test was conducted against electroplating waste-based metal ion.  The SEM results showed that GO exhibited the layered structure meanwhile MRGO exhibit as a Fe₃O4-modified GO layered surfaces. Furthermore, MRGO made by different ferrochloride tetrahydrate differed in the Fe₃O4 nanoparticles formation on the surface of GO. Increasing the composition of ferro chloride tetrahydrate increased the formation of Fe₃O4. MRGO developed as a superparamagnetic material which could easily interact during the external magnetic field applications and this character will easily disappears when the magnetic field is removed. Moreover, MRGO (FeCl₂.4H₂O 0.0064M) is successfully applied as nickel metal ion (Ni2+) adsorbents with the adsorption ability of 78,24%. This results showed that MRGO have a potential prospect as an effective and efficient adsorbent advanced material candidate.
KARAKTERISASI SIFAT TERMAL DAN OPTIK POLYDIMETHYLSILOXANE SEBAGAI LENSA INVERS Yenny Meliana; Andinnie Juniarsih; Juvitha Anggraini
Jurnal Sains Materi Indonesia Vol 18, No 4: JULI 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (296.321 KB) | DOI: 10.17146/jsmi.2017.18.4.4149

Abstract

Polydimethylsiloxane (PDMS) adalah karet silikon yang stabil secara fisik dan kimia dan telah tersedia komersial. PDMSmerupakanmaterial polimer dengan rentang indeks bias 1,47-1,55 danmempunyai karakter transparansi yang tinggimencapai 95%sehingga bahan ini baik digunakan sebagai alat optik sederhana berupa lensa invers. Penelitian ini bertujuan untuk membuat lensa invers dari polimer PDMS serta mengetahui sifat optik dan termalnya.Tahapan penelitian lensa invers meliputi: pencampuran antara base PDMS dengan curing agent PDMS dengan perbandingan 10 :1, kemudian dilakukan proses penetesan diatas slide kaca lalu dibalikkan (invers) dengan variasi jumlah tetesan 2,3 dan 4 drop dan terakhir dilakukan proses curing dengan variasi suhu curing 70 °C, 80 °C, dan 90 °C. Karakterisasi bahanmeliputi analisismorfologi lensamenggunakan SEM/EDX, intensitas cahaya menggunakan luxmeter serta analisis nilai transtition glass (Tg) menggunakan TGA/DTA. Hasil karakterisasi analisis luxmeter menunjukkan semakin rendah suhu curing semakin tinggi intensitas cahaya yang dapat menembus lensa. Foto SEM memeperlihatkan adanya gelembung pada lensa. Semakin besar volume lensa maka semakin sedikit gelembung pada lensa. Hasil analisis menggunakan TGA memperlihatkan untuk rentang suhu pemanasan antara 70 °C hingga 90 °C nilai suhu degradasi (Td) lensa invers tidak berpengaruh signifikan. Hasil penelitian ini menunjukkan bahwa lensa yang baik adalah pada variasi 4 tetes dan suhu curing70 °C dengan nilai intensitas 177 lux dan nilai Td sebesar 301,5 °C
ROLES OF PREPARATION METHOD ON CHARACTERISTICS OF SUPRAMOLECULAR-STRUCTURED POLYMER ELECTROLYTE MEMBRANE FUEL CELL BASED ON SULFONATED POLYSTYRENE Sunit Hendrana; Morina Septiviani Semboor; Christi Liamita Natanael; Iman Rahayu; Mashadi Mashadi; Sudirman Sudirman
Jurnal Sains Materi Indonesia Vol 18, No 4: JULI 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1017.862 KB) | DOI: 10.17146/jsmi.2017.18.4.4130

Abstract

Polymer Electrolyte Membrane Fuel Cell with supramolecular structure based on Sulfonated Polystyrene (S-PS) have been developed in Research Centre for Physics LIPI. In forming the supramolecular structure sulfonate groups in S-PS are aligned with polyethylene-graft-maleic anhydride (PE-g-MA) which carried out by dissolution of the constituent and mixing of both. The alignmentof sulfonate groups in s-PS is carried out in a liquid form.Therefore, in this study, the effect of concentration of the solution of both polymersconstituent to the alignment of the sulfonate groups and the characteristics of the membrane produced is studied. Scanning Electron Microscope (SEM) images show that all membranes prepared are rigid. Differential Scanning Calorimetry (DSC) studied show very significance differences in its crystal sizes. XRD diffraction data also support the previous results. Membrane prepared from very dilute solution having better ion exchange capacity (IEC), water uptake and ionic conductivity. Therefore, the experiments results showing that very low concentration of polymer constituent, clearly, produced better interaction of both, which agree with hyphotesis in this work where supramolecular structure can be formed by mixing two very dilute polymer solutions.
BIOSINTESIS NANOPARTIKEL PERAK MENGGUNAKAN EKSTRAK DAUN SAMBILOTO: OPTIMASI PROSES DAN KARAKTERISASI Nyoman Wendri; Ni Nyoman Rupiasih; Made Sumadiyasa
Jurnal Sains Materi Indonesia Vol 18, No 4: JULI 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (236.749 KB) | DOI: 10.17146/jsmi.2017.18.4.4125

Abstract

BIOSINTESIS NANOPARTIKEL PERAK MENGGUNAKAN EKSTRAK DAUN SAMBILOTO: OPTIMASI PROSES DAN KARAKTERISASI. Pada penelitian ini telah berhasil disintesis nanopartikel perak (AgNP) dengan metode biologi (biosintesis). Sintesis dilakukan dengan menggunakan ekstrak daun Sambiloto (Andrographis paniculata Ness). Penelitian ini meliputi penentuan rasio volume sintesis (larutan AgNO3:larutan ekstrak) yang optimum dan karakterisasi nanopartikel perak yang terbentuk. Konsentrasi larutan AgNO3 yang digunakan 1 M dan larutan ekstrak adalah 7,5 g/L. Karakterisasi meliputi spektrofotometer UV-Vis, EDS, TEM, XRD dan FTIR. Hasil penelitian menunjukkan bahwa rasio volume sintesis optimum adalah 10 µL:10 mL. Karakteristik nanopartikel perak yang diperoleh adalah absorbsi surface Plasmon resonance (SPR) pada panjang gelombang 423 nm. Puncak-puncak difraksi teramati pada sudut 2θ yaitu 38,180, 45,810 dan 64,870, yang bersesuaian dengan bidang hkl: (1 1 1), (2 0 0) dan (2 2 0). Data tersebut menunjukkan bahwa nanopartikel perak yang terbentuk memiliki struktur kristal face centre cubic (FCC) dengan parameter kisi a sebesar 4,03 Å. Hasil karakterisasi dengan TEM diperoleh ukuran partikel sekitar 10-30 nm. ABSTRACT    BIOSYNTHESIS OF SILVER NANOPARTICLES USING SAMBILOTO LEAF EXTRACT: OPTIMIZATION PROCESS AND CHARACTERIZATION. It has been synthesized silver nanoparticles (AgNP) with biological method or biosynthesis, successfully. The synthesis is done using extract of Sambiloto leaf (Andrographis paniculata Ness). The study involved determining the optimum volume ratio of synthesis i.e. AgNO3 solution:extract solution and characterization of nanoparticles formed. The concentration of AgNO3 solution used was 1 M and extract solution was 7.5 g/L. The characterization included UV-Vis spectrophotometer, EDS, TEM, XRD and FTIR spectrophotometer. The results obtained were, the optimum volume ratio of synthesis was 10 µL:10 mL. The characteristics of AgNP formed were the Surface Plasmon Resonance (SPR) absorbance at a wavelength of 423 nm. The diffraction peaks observed at angles 2θ of 38.180, 45.810 and 64.870 which corresponded to the hkl (1 1 1), (2 0 0) and (2 2 0). These results showed that the crystal structure of AgNP formed was face center cubic (FCC) with lattice parameter a, of 4.03 Å. TEM characterization showed that the size of AgNP nanoparticles was about 10-30 nm.

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