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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS Majalah Ilmiah Pengkajian Industri
Nanda Shabrina
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Aerospace Engineering Astronomy Chemical Engineering, Chemistry & Bioengineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Transportation

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MICROSTRUCTURE AND OXIDATION BEHAVIOR OF THE OXIDE DISPERSION STRENGTHENED STAINLESS STEEL 316L WITH ZIRCONIA DISPERSION Ahda, Syahfandi; Agus Sujatno; Diene Hairani; Nanda Shabrina; Sulistioso Giat; Bandriyana
Majalah Ilmiah Pengkajian Industri Vol. 15 No. 2 (2021): Majalah Ilmiah Pengkajian Industri
Publisher : Deputi TIRBR-BPPT

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Abstract

Synthesis of the oxide dispersion sODS steels was performed by dispersing 0.5 wt % zirconia to the stainless steel SS 316L by the powder metallurgy method. The ball milling process was carried out for pre-alloying the elements continued with the consolidation performed by the compaction and sintering process using the APS (Arc Plasma Sintering). Analysis of microstructure was performed by observing the morphology, identify the phase and evaluate the oxide distribution. An oxidation test was carried out at 700oC for 8 hours using the MSB (Magnetic Suspension Balanced) apparatus to evaluate the primary oxidation curve. The same grain fineness consists of 2 dominant phases, so the presence of an austenitic phase and a ferritic phase has been analyzed from the X-Ray Diffraction pattern. The homogeneous distribution of zirconia was observed, followed by improvements in mechanical properties, which could be identified by hardness testing. The parabolic phenomenon oxidation curve was explained by the excellent high-temperature oxidation behaviour of the ODS steel, followed by the formation of  ZrO2 oxide protective thin layer.
Sintesis Nanopartikel Cobalt Ferrite (CoFe2O4) dengan Metode Kopresipitasi dan Karakterisasi Sifat Kemagnetannya Eko Arief Setiadi; Nanda Shabrina; Hesti Retno Budi Utami; Nur Fadhilah Fahmi; Takeshi Kato; Satoshi Iwata; Edi Suharyadi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 3, No 01 (2013): IJAP VOLUME 03 ISSUE 01 YEAR 2013
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v3i01.1216

Abstract

Magnetic nanoparticles of cobalt ferrite (CoFe2O4) have been synthesized by co-precipitation method with various synthesis temperature and concentration of NaOH. The structural characteristics and particle size of CoFe2O4 were determined by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM), its showed that nanoparticles well crystallized with various grain size which depend on synthesis parameters. The grain sizes estimated using the Scherrer formula were found that the grain size increased with increasing temperature synthesis and decreasing concentration of NaOH. Magnetic characterization of CoFe2O4 nanoparticles was investigated by using a Vibrating Sample Magnetometer (VSM). Sample with various concentration of NaOH showed that coercivity was decrease with the decrease of particle size. In other hand, samples with various synthesis temperature found that sample withsmallest grain size have high coersivity. The saturation magnetization increase when crystallinity increase. Based on the results, it can be concluded that magnetic characterization of CoFe2O4 was influenced by grain size and crystallinity.
Co-Authors Agus Sujatno Bandriyana Diene Hairani Edi Suharyadi Eko Arief Setiadi Hesti Retno Budi Utami Nur Fadhilah Fahmi Satoshi Iwata Sulistioso Giat Syahfandi Ahda Takeshi Kato