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Jurnal Sains Materi Indonesia

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Published by Badan Tenaga Nuklir Nasional

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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.

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Articles 17 Documents

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Search results for , issue "Vol 7, No 3: JUNI 2006" : 17 Documents clear

PENGARUH LAJU PENDINGINAN TERHADAP STRUKTURMIKRO DAN DERAJAT PREFERRED ORIENTATION PADA BULK TEKSTUR YBa2Cu3O7-x Wisnu Ari Adi; Engkir Sukirman; Didin S. Winatapura; Yustinus P.; M. Refai M.
Jurnal Sains Materi Indonesia Vol 7, No 3: JUNI 2006
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

PENGARUH LAJU PENDINGINAN TERHADAP STRUKTURMIKRO DAN DERAJAT PREFERRED ORIENTATION PADA BULK TEKSTUR YBa2Cu3O7-x. Telah dilakukan sintesis superkonduktor YBa2Cu3O7-x dengan metode melt texture growth modifikasi. Selama proses pendinginan pada suhu di bawah suhu peritektik Tp (900 oC–1000 oC) YBCO fasa–211 bereaksi dengan cairan (3 BaCuO2+2CuO) membentuk YBCO fasa–123. Pada percobaan ini dilakukan lima variasi laju pendinginan, yaitu 5 oC/jam, 8 oC/jam, 10 oC/jam, 12 oC/jam dan 15 oC/jam. Data SEM menunjukkan telah terjadi keteraturan butir-butir kristal pada arah tertentu. Analisis data difraksi neutron menunjukkan bahwa semakin lambat laju pendinginan, intensitas puncak (00l) meningkat dan intensitas puncak (hk0) menurun. Perbandingan intensitas puncak (005) I005 dengan puncak (110) I110 yang dihubungkan dengan koefisien March G bersesuaian dengan fungsi preferred orientation dari March–Dollase dengan persamaan empiris: I005 / I110 = 0,3501 . G (-4,0914). Laju pendinginan 15 oC/jam, 12 oC/jam, 10 oC/jam, 8 oC/jam, dan 5 oC/jam berturut-turut memiliki koefisien March sebesar 0,88; 0,84; 0,81; 0,78; dan 0,75. Disimpulkan bahwa laju pedinginan sangat mempengaruhi derajat preferred orientation pada bulk tekstur YBa2Cu3O7-x. Semakin lambat laju pendinginan, derajat preferred orietation semakin kecil atau keteraturan butir-butir kristalnya semakin baik.

ADHESION OF THIN COATING ON ALUMINUM ALLOYS Suryanto Suryanto
Jurnal Sains Materi Indonesia Vol 7, No 3: JUNI 2006
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

ADHESION OF THIN COATING ON ALUMINUM ALLOYS. Adhesion of thin coating on aluminum alloy was studied. Adhesion of thin coating on a substrate is a key parameter in surface engineering. Adhesion testing becomes interesting thing to be applied in characterization of a coating, even though the fundamental understanding of the process is still limited. Adhesion evaluation of a coating can be carried out using many methods and one of them is scratch method. Scratch was performed on a surface of coating by means of an indenter. The indenter should be very hard such as a diamond. Scratch was obtained by moving the sample under indenter slowly with a constant speed. A progressive increase or step wise load was given. The scratches were evaluated by means of a scanning electron microscope. In this study, adhesion of metallic coating-copper, nickel, chromium and ceramic coating-titanium nitride, chromium nitride on aluminum alloy and that on nickel deposited aluminum alloy were evaluated. Scratch testing with a step wise load was applied. Three parameters of adhesion-critical load, adhesion index and interface toughness were discussed. The results show that scratch testing is suitable for evaluating the above coating.Adhesion of duplex coating is higher than that of single coating and adhesion of duplex nickel coating is the highest.

IMPROVING ANATASE TO RUTILE TRANSITION TEMPERATURE BY MILLING Suminar Pratapa; Triwikantoro Triwikantoro; Hariyati Purwaningsih
Jurnal Sains Materi Indonesia Vol 7, No 3: JUNI 2006
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

IMPROVING ANATASE TO RUTILE TRANSITION TEMPERATURE BY MILLING. An intensive investigation using X-ray diffractometry has been conducted to study the optimum mechanical and thermal conditions for the transition of anatase-to-rutile from a titanium dioxide (TiO2) powder. Milling was applied by employing a conventional ball milling instrument and a quasi-high-energy pulveriser and varying the milling period. Heat treatment was performed by calcination at 850, 900, 950, 975, 1000, 1050 and 1100 °C for 1 hour, being the predicted optimum temperature to obtain fully rutile powder was 975°C. Each powder was milled and then calcined prior to the X-ray diffraction investigation. X-ray diffraction data were analysed using (1) standard identification and peak characterisation, (2) the Rietveld method to give the weight fractions, lattice constants and crystallite size and strain estimates, and (3 )Mozaix, an own-developed software to provide strain, crystallite size and size distribution of phases. Results showed that milling speed and milling up to 24 hours does not significantly change the phases’ composition, but enhances the transition temperature. Conventional milling gives better results than pulverising. Conventional milling at 100 rpm for 3 hours reduces the transition temperature from 1100°C to 1000°C. Longer milling, however, does not improve the transition temperature. The optimum process is discussed and SEM micrographs are used to support the argument.

APPLICATION OF BENZOTRIAZOLEAS CORROSION INHIBITOR OFAPI 5LX65 IN SODIUM CHLORIDE SOLUTION P. Yatiman; N. M. Surdia; S. Purwadaria; B. Ariwahjoedi; R. Suratman
Jurnal Sains Materi Indonesia Vol 7, No 3: JUNI 2006
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

APPLICATION OF BENZOTRIAZOLEAS CORROSION INHIBITOR OFAPI 5LX65 IN SODIUM CHLORIDE SOLUTION. The inhibition mechanismofAPI 5LX65 carbon steel corrosion by benzotriazole (BTAH) in 0.5% NaCl solution saturated with CO2 at temperatures of 25, 45, 65 and 85 oC was investigated using electrochemical impedance spectroscopy (EIS). The measurements were done on the steel specimens after they were immersed into the test solutions containing BTAH for 30 hours. The polarization resistance, Rp, of each specimen was then determined with respect to electrical equivalent circuit proposed by Randall for a metal which is actively corroding in its environment. The data were then used to calculate the inhibition efficiency and surface coverage of carbon steel by BTAH. It was found that the BTAH concentration and temperatures of the test solutions affected significantly the inhibition efficiency. The presence of carbonic acid decreases the inhibition efficiency, however by using 8.40 mmol/LBTAH the inhibition efficiency had reached more than 90% at all temperatures. The increase of temperature has reduced the surface coverage and has lead to decrease the inhibition efficiency. The re-increase of inhibition efficiency at 85oC was related to the decrease in FeCO3 and CO2 solubility. Moreover, it was revealed that the adsorption of BTAH on the steel surface obeyed the Temkin’s adsorption isotherm.

PELAPISAN PERMUKAAN KAYU LAPIS DENGAN POLIMER AKRILAT MENGGUNAKAN RADIASI ULTRA VIOLET Sugiarto Danu; Darsono Darsono; Anik Sunarni
Jurnal Sains Materi Indonesia Vol 7, No 3: JUNI 2006
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

PELAPISAN PERMUKAAN KAYU LAPIS DENGAN POLIMER AKRILAT MENGGUNAKAN RADIASI ULTRA VIOLET. Penelitian pelapisan permukaan kayu lapis dari kayu kamper (Dryobalanops spp.) dengan bahan pelapis polimer akrilat telah dilakukan menggunakan bahan pelapis radiasi dengan nama komersial Overlon, yaitu, dua senyawa polimer epoksi akrilat dan satu senyawa uretan akrilat. Proses pengeringan/pemadatan (curing) dilakukan menggunakan sumber radiasi ultra violet dengan intensitas 80 Watt/cm pada beberapa variasi tebal lapisan dan kecepatan konveyor. Parameter sifat lapisan hasil iradiasi yang diukur meliputi fraksi-gel, weight-swelling ratio, laju nyala, kekerasan pendulum, adesi, kilap, dan ketahanan terhadap bahan kimia, pelarut dan noda. Hasil penelitian menunjukkan bahwa resin epoksi akrilat lebih reaktif dan lapisan yang dihasilkan mempunyai sifat fisik, mekanik, termal, dan kimia yang lebih baik dibanding uretan akrilat.Adesi antara lapisan polimer dengan permukaan kayu lapis yang diuji dengan metode cross-cut memenuhi standar pengujian. Pengujian adesimenggunakanmetode uji tarik menunjukkan tersebarnya data besarnya kuat tarik dan pola kerusakan.

STRUKTUR DAN SIFAT OPTIK FILM ZnO HASIL DEPOSISI DENGAN TEKNIK SPIN-COATING MELALUI PROSES SOL-GEL Akhiruddin Maddu; Candra A. Basuki; Irmansyah Irmansyah; Sidikrubadi Pramudito
Jurnal Sains Materi Indonesia Vol 7, No 3: JUNI 2006
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

STRUKTUR DAN SIFAT OPTIK FILM ZnO HASIL DEPOSISI DENGAN TEKNIK SPIN-COATING MELALUI PROSES SOL-GEL. Film ZnO telah dibuat pada substrat kaca dengan teknik deposisi spin coating melalui proses sol-gel. Pembuatan film ZnO dari prekursor zinc acetate dengan laju putaran 3.000 rpm selama 60 detik di atas pelat spin coater. Film yang diperoleh dikeringkan pada suhu ruang kemudian dilakukan annealing pada suhu 500 oC selama 3 jam. Hasil XRD menunjukkan bahwa film ZnO yang terbentuk adalah polikristal wurtzite heksagonal dengan nilai parameter kisi masing-masing adalah a = 3,290 Å dan c = 5,2531 Å. Ukuran kristal rata-rata ZnO adalah 29,554 nm. Berdasarkan morfologi permukaan hasil foto SEM menunjukkan film ZnO berbentuk lempengan-lempengan (disks) yang tidak seragamdan tidak beraturan. Karakterisasi spektroskopi UV-Vis menghasilkan karakteristik optik film ZnO, yaitu spektrum transmitansi optik dalam rentang panjang gelombang 370 nm sampai dengan 970 nm. Dari data spektrum UV-Vis tersebut ditentukan lebar celah energi ZnO sebesar 3,2 eV.

DIELECTRIC PROPERTIESOF SMECTIC-Cα* PHASE Andika Fajar; Hiroshi Orihara
Jurnal Sains Materi Indonesia Vol 7, No 3: JUNI 2006
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

DIELECTRIC PROPERTIESOF SMECTIC-Cα* PHASE. Linear and third-order nonlinear dielectric measurements have been performed within the smectic-Cα* phase of antiferroelectric liquid crystal 4-(1-methyl-heptyloxycarbonyl) phenyl 4-octylcarbonyloxybiphenyl-4-carboxylate (MHPOCBC). In the low temperature region of smectic-Cα* phase, we observed the hysteresis of dielectric constant in cooling and heating process measurement. From the frequency dispersion measurement, it has been found that the frequency relaxation of antiferroelectric Goldstone mode and ‘low frequency mode’, decreased with increasing the temperature until approach the center of the smectic-Cα* phase.

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