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All Journal Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir
Jan Setiawan
Pusat Teknologi Bahan Bakar Nuklir – BATAN

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PENGARUH ROL DINGIN DAN ANIL TERHADAP KARAKTERISTIK STRUKTUR MIKRO DAN KEKERASAN MIKRO PADUAN Zr-0,5%Nb-Si Heri Hardiyanti; Arief Sasongko Adhi; Jan Setiawan
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 26 No. 2 (2020): Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2020.26.2.6069

Abstract

EFFECTS OF COLD-ROLLING AND ANNEALING ON THE MICROSTRUCTURE AND MICROHARDNESS CHARACTERISTICS OF Zr-0.5%Nb-Si. The performance improvement of zirconium alloys can be done by adding a certain percentage of common alloying elements such as Nb and Si. The addition of Nb provides resistance to irradiation and stabilizes the β phase (which normally forms at high temperatures) at room temperature. The addition of Si increases the strength of the alloys. The synthesis of a Zr-0.5% Nb-Si alloy have been carried out using an electric arc furnace. The microstructure and the microhardness of this alloy were observed after cold-rolling and annealing. It can be seen from the annealed alloy without cold-rolling that the grain size is larger with reduced microhardnes. The alloy treated with cold-rolling shows changes in the microstructure while the deformation density increases, which results in an increase in microhardness. Heat treatment to the cold-rolled alloy changes the microstructure of the alloy where recrystallization occurs, and the deformation density decreases, which results in the decreasing of microhardness. The lowest grain size and microhardness for the alloy that was cold-rolled at ε = 0.8 and annealed are 0.302 mm and 187 HVN, respectively.
PENENTUAN UMUR YELLOW CAKE SECARA RADIOKRONOMETRI Erlina Noerpitasari; Syamsul Fatimah; Iis Haryati; Yanlinastuti Yanlinastuti; Jan Setiawan; Boybul Boybul; Arif Nugroho
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 26 No. 2 (2020): Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2020.26.2.6057

Abstract

YELLOW CAKE AGE DETERMINATION BY RADIOCHRONOMETRY. Radiochronometric dating of yellow cake has been carried out. The aim of this study was to obtain data on the age of yellow cake for compiling a database for nuclear forensics library. The radiochronometer used was228Th/232Th. 232Th is thorium which naturally co-exists in yellow cake and will reach a decay equilibrium to 228Th. In the yellow cake production process, however, the equilibrium is disturbed so that the "time" will be zeroed again. The test samples were yellow cake from Cogema, from PTBGN mining in Kalan, and by-products from Petrokimia Gresik. The steps of processes include dissolving the sample, separating thorium from uranium by cation exchange chromatography using dowex 50W-X8 resin, electrodeposition of thorium and isotopes analysis using an alpha spectrometer. Age determination was performed by calculating the 228Th/232Th activity ratio and decay formula iteration. Based on the analysis of the 228Th and 232Th isotopes using an alpha spectrometer and the results of age calculations, the age of Cogema yellow cake was not able to be determined because it does not contain 232Th. The age of Petrokimia Gresik yellow cake is 9.90 years with a bias of 20.35 years and the age of PTBGN yellow cake is 12.85 years with a bias of more than 20.15 years when compared to the known estimated production time. The bias obtained is higher when compared to the results determined by previous researchers by the same method,i.e., a bias of less than 10 years.
KARAKTERISTIK PERMUKAAN SERAT SILIKON KARBIDA HASIL PEMINTALAN LISTRIK DARI POLYCARBOSILANE DALAM N,N-DIMETILFORMAMIDA (DMF)/ TOLUENA Deni Mustika; Riwandi Sihombing; Slamet Pribadi; Ratih Langenati; Agus Sujatno; Arbi Dimyati; Jan Setiawan; Eddy Indarto
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 21 No. 1 (2015): Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2015.21.1.2257

Abstract

SiC SURFACE CHARACTERISTIC RESULT OF ELECTRIC SPINNING FROM POLICARBOSILANE IN THE DIMETILFORMAMIDA (DMF)/ TOLUENA. Non oxide ceramic silicon carbide (SiC) has unique properties such as mechanical strength, chemical and thermal stability that is used in many applications. Results of modelling studies on SiC show good stability on neutron irradiation and had low permeability againts fission product increased the interest in the use of SiC in nuclear applications. Composites form was used to increased mechanical properties. Composites that used fiber as filler show better mechanical properties than filler in form particle and whisker. In SiC composites, mechanical properties influenced by interphase properties and/or SiC surface characteristic. Electrospinning was a promising method to form fibers. This research aims to study the characteristics of silicon carbide fiber surface produced from polycarbosilane that solute by toluene and N,N-dimethylformamide (DMF). The addition of DMF and polycarbosilane in toluen affect the electrospinnability and characteristic the surface of fibers. The SiC fibers produced from polycarbosilane that solute by toluen and N,N-dimethylformamide (DMF) form continue fibers with ribbon liked. Black spot on the surface of pyrolysis fibers possible from free carbon or graphite contamination from furnace material. Value of surface area of pyrolysis fibers at 3.321 – 46.14 m2/g and porous in micro size, with distribution its radius in range at 1-3 nm, highgest distribution in size less than 2 nm. Pyrolysis and sintering in higher temperature expected to form fiber with less porous and its density able to approach the theoretical density.
Co-Authors Agus Sujatno Arbi Dimyati Arief Sasongko Adhi Arif Nugroho Boybul Boybul Deni Mustika Eddy Indarto Erlina Noerpitasari Heri Hardiyanti Iis Haryati Ratih Langenati Riwandi Sihombing Slamet Pribadi Syamsul Fatimah Yanlinastuti Yanlinastuti