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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 9 Documents
 1 
Search results for , issue "Vol 20, No 4: JULY 2019" : 9 Documents clear
EFFECTS OF STARCH-GLYCEROL CONCENTRATION RATIO ON MECHANICAL AND THERMAL PROPERTIES OF CASSAVA STARCH-BASED BIOPLASTICS Akbar Hanif Dawam Abdullah; Oceu Dwi Putri; Winda Windi Sugandi
Jurnal Sains Materi Indonesia Vol 20, No 4: JULY 2019
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (880.12 KB) | DOI: 10.17146/jsmi.2019.20.4.5505

Abstract

This study aimed to investigate the effects of different starch-glycerol concentration ratio on mechanical and thermal properties of cassava starch bioplastics. Bioplastics were prepared by mixing starch with glycerol at different starch-glycerol w/w ratio (2.5:1, 2.75:1, 3:1 and 3.5:1). Mechanical properties was evaluated by measuring tensile strength and elongation at break where thermal properties was assessed by thermogravimetric analysis to determine the glass transition temperature (Tg), melting temperature (Tm) and melting enthalpy (ΔHm) of bioplastics. Microstructure and chemical interactions in bioplastics were evaluated by SEM and FTIR. The surface hydrophobicity was determined by measuring the water contact angle. The increase of starch-glycerol concentration in bioplastics formed rough surface where the interaction of glycerol and starch molecules mainly occurred through hydrogen bonds. It also formed stronger and more rigid structure with the increase in tensile strength from 1.90 MPa to 2.47 MPa and the decrease in elongation at break from 8.55% to 5.92%. Furthermore, the increase of starch-glycerol concentration increased Tg from 37.5 ºC to 38.6 ºC, Tm from 96.3 ºC to 120.7 ºC and ΔHm from 100.4 J/g to 155 J/g. Moreover, surface contact angle of bioplastics was increased from 40.6º to 60.2º with the increase of starch-glycerol concentration ratio.
CORROSION BEHAVIOR OF Zr-10Mo ALLOYS IN NIOBIUM-DOPED LACTATE RINGER’S SOLUTION Vita Yuliana Prastika; Pradoto Ambardi; Djoko Hadi Prajitno
Jurnal Sains Materi Indonesia Vol 20, No 4: JULY 2019
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.2019.20.4.4627

Abstract

This research discusses the corrosion behavior of Zr-10Mo alloys in Niobium-doped lactate ringer ’s solution. The addition of Niobium of 1%, 3% and 5% on Zr-10Mo alloys aims to study the effect of adding Niobium to the hardness, microstructure and corrosion resistance of Zr-Mo alloys. The alloys are made by melting the materials of Zr, Mo and Nb with a certain percentage of weight using single arc melting furnace in Argon atmosphere with high purity and Tungsten eletrodes. The alloys (as cast) are subjected to hardness testing using C-scale rockwell, microstructure using optical microscopy, compounds and phases in the alloys (as cast) using XRD and corrosion testing using polarization method in lactate ringers’ solution. The hardness value increases by the addition of Niobium, Zr-10Mo-1Nb alloy of 34 HRC, Zr-10Mo-3Nb alloy of 38 HRC and Zr-10Mo-5Nb alloy of 41.5 HRC. The basketweave-shaped microstructure with the addition of Niobium creates relatively smaller grain size. The value of corrosion rate decrases by the addition of Niobium at the immersion times of 0 minute, 60 minutes and 120 minutes, Zr-10Mo-1Nb alloy of 4.208 mpy, Zr-10Mo-3Nb alloy of 3.538 mpy and Zr-10Mo-5Nb alloy of 2.813 mpy, included in the excellent category (1-5 mpy).
DEPOSITION OF YTTRIA-STABILIZED ZIRCONIA CERAMIC ON SS316L BY PULSED SOLID-STATE ND:YAG LASER Mardiyanto Mangun Panitra; Abu Khalid Rivai
Jurnal Sains Materi Indonesia Vol 20, No 4: JULY 2019
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.2019.20.4.5521

Abstract

Austenitic stainless steel in general has a limited service temperature up to 600°C. Nevertheless, service temperature more than that temperature are one of the key feature of advanced nuclear reactors to gain higher thermal efficiency which is related to economic beneficial, and also to withstand from abnormal condition. However, austenitic stainless steel such as SS316 class is well-known structure material for nuclear power reactors and other power plants. Therefore, one of the key issue is to modify SS316 so that has capability to service higher temperature. One of the technique for that purpose is ceramic-coated SS316L. In this preliminary study, thin films of zirconia-based ceramic i.e. YSZ (Yttria-Stabilized Zirconia) have been deposited on a SS316L using Plasma-Pulsed Laser Deposition (PLD) at Center For Science and Technology of Advanced Materials laboratory – National Nuclear Energy Agency of Indonesia (BATAN). Thin film was deposited with the constant oxygen flow injection of 20 and 40 sccm (Standard Cubic Centimeters per Minute) that produce a chamber pressure of 60 and 200 mTorr for the numbers of laser shots of 7.2×104 and 14.4×104, respectively. The substrate temperature during deposition was of 850oC. Afterward, the samples were analyzed using Optical Microscope, Scanning Electron Microscope – Energy Dispersive X-ray Spectroscope (SEM-EDS) and Atomic Force Microscope (AFM). The results showed that the YSZ could homogeneously and sticky deposited on the surface of the SS316L surface.  The surfaces were very smoothly formed with the surface roughness in the nano-meter scale range of 20-90 nm.
OPTIMIZATION OF MECHANICAL STRENGTH AND MICROSTRUCTURE ON AUSTEMPERING ZINC HEAT TREATMENT IN LATERITIC NICKEL STEELS Satrio Herbirowo; Setyo Hartadi; Rahmat D. Widodo; Bintang Adjiantoro
Jurnal Sains Materi Indonesia Vol 20, No 4: JULY 2019
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (872.316 KB) | DOI: 10.17146/jsmi.2019.20.4.4660

Abstract

The development of lateritic steel is currently being discussed by various research institutions. It is not separated from the potential of laterite-based steel into national steel. This research using austempering heat treatment process with holding time variation for 30, 60, and 90 minutes with Zn (Zinc) element from melting ingot with 90% purity for cooling media. The characterization of laterite steel is done by hardness testing, impact resistance, microstructure, scanning electron microscopy, and energy dispersive spectroscopy. The results showed that the impact resistance value decreased 8.46%, which was initially 209 J to 191.3 J. Besides, the hardness value increased 36, 58% of which was originally 164 HV to 224 HV. Judging from its physical properties, the microstructure formed bainite ferrite perlite at holding time 90 minutes while the fracture is included into the ductile fracture because there are dimple holes showed dark and opaque
THE INFLUENCE OF COMPOSITION OF CNT (CARBON NANOTUBE) ON THE PHYSICAL PROPERTIES OF BIOPLASTIC MADE FROM CASSAVA STARCH Masitoh Mangsur; Akbar Hanif Dawam Abdullah; Rahmat Firman Septiyanto; Yus Rama Denny Muchtar; Isriyanti Affifah
Jurnal Sains Materi Indonesia Vol 20, No 4: JULY 2019
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.2019.20.4.5514

Abstract

Bioplastics are starch-based polymers that are easily degraded by microorganisms, so they can be used as an alternative to the use of conventional plastics. In this research, bioplastics made from cassava starch was made using glycerol as plasticizer and used MWCNTs (Multi-Wall CNTs) type CNT as reinforcement with variations in the composition of 0%, 1%, 2%, and 3%. Bioplastics are made with a dry method (dry blending) with stages of pre-mixing, mixing, hot press and cold press. Characteristics of bioplastic starch/CNT include tensile strength, biodegradation and morphological. The test results show that the addition of CNT composition affects the mechanical properties of bioplastics. The optimum value of tensile strength occurred in the addition of 2% CNT at 13.52 MPa. Biodegradable test results using the Aspergillus niger mushroom prove that bioplastic starch/CNT can be degraded well. The results of morphological characteristics in the form of SEM results showed that 3% bioplastic starch / CNT had cracks and resulted in decreased tensile strength. FTIR test results indicate the presence of a new functional group C≡C because of the addition of CNT.
Cover JUSAMI Vol. 20, No. 4, July 2019 Cover JUSAMI
Jurnal Sains Materi Indonesia Vol 20, No 4: JULY 2019
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (23.331 KB)

Abstract

ANALYSIS OF MICROSTRUCTURE AND HARDNESS OF WELDED JOINTS OF DISSIMILAR STEEL OF AISI 1018 - AISI 304 Gilang Gumilar; Imin Abdulah; Rochim Suratman; Asep Ridwan Setiawan
Jurnal Sains Materi Indonesia Vol 20, No 4: JULY 2019
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.2019.20.4.5280

Abstract

This research studies the microstructure and hardness property of shield metal arc welding (SMAW) from dissimilar metals between austenitic stainless steel (SS) AISI 304 and low carbon steel (LCS) AISI 1018 using E308 filler metal. The procedure used was LCS-to-LCS welding carried out without post weld heat treatment (PWHT) and SS-to-SS welding followed by PWHT at a temperature of 1000ÚC and holding time for 12 minutes. Then, it was followed by shock cooling in aqueous media. The difference in PWHT stages in the two procedures is expected to affect the microstructure and hardness of the welding results. This was conducted to find out more precise procedures in the SMAW technique for welding dissimilar metals like AISI 304 with AISI 1018 so that the risk of chromium carbide precipitate formation and the low hardness of welded joints can be reduced. The results showed there were chromium carbide precipitates in the heat-affected zone (HAZ) of AISI 304, grain enlargement in the HAZ area of both steels, as well as the formation of the ferrite delta phase in the welding area by LCS-to-LCS welding. While the value of hardness in the HAZ area of AISI 304 has decreased, increases occur in the HAZ area of AISI 1018 in all welding conditions. In addition, PWHT treatment can increase the hardness on the AISI 1018 side due to the formation of the martensite phase, decrease in the hardness value on the AISI 304 side, and the reduced ferrite delta phase and the number of chromium carbide precipitates.
Preface JUSAMI Vol. 20, No. 4, July 2019 Preface JUSAMI
Jurnal Sains Materi Indonesia Vol 20, No 4: JULY 2019
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (194.565 KB)

Abstract

SURFACE MODIFICATION OF TEMPO-MEDIATED CELLULOSE NANOFIBRIL WITH OCTADECYLAMINE Nanang Masruchin; Arif Nuryawan; Wida Banar Kusumaningrum; Sudarmanto Sudarmanto; Lilik Astari; Putri Amanda; Resti Marlina; Lisman Suryanegara
Jurnal Sains Materi Indonesia Vol 20, No 4: JULY 2019
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (625.154 KB) | DOI: 10.17146/jsmi.2019.20.4.5308

Abstract

In this study, surface modification of 2,2,6,6-tetramethylpiperidine-1-oxyl radical TEMPO-cellulose nanofibrils (TCNF) was obtained by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) and N–hydroxysuccinimide (NHS)-mediated system. The carboxylate groups on TCNF surface was replaced by conjugation of octadecylamine (ODA). The conversion of the carboxylate groups on CNF into amide I and II groups was confirmed by attenuated transform reflectance-infrared (ATR-FTIR) and elemental analysis study. Further, decarboxylation of TCNF at higher temperature was hindered by the presence of amide groups resulted in the higher thermal stability of TCNF as observed by thermogravimetry analysis (TGA). These results suggested the possibility of modifying surface negatively charged of TCNF with conjugated amine groups into thermally stable nanocellulose.

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