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All Journal Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) Jurnal Kimia Terapan Indonesia Metalurgi
Pudji Untoro
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics

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UJI OKSIDASI BAJA AISI 316L UNTUK BAHAN KOMPONEN PLTN MAJU. B Bandriyana; Pudji Untoro; Bambang Sugiono
Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) Vol 4, No 1 (2003): Agustus Edisi Khusus 1 2003
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jstni.2003.4.1.1684

Abstract

UJI OKSIDASI BAJA AISI 316L UNTUK BAHAN KOMPONEN PLTN MAJU. Pengujian oksidasi dilakukan untuk evaluasi ketahanan korosi baja AISI 316L sebagai bahan komponen PLTN maju. Pengukuran laju oksidasi dilakukan dengan uji termogravimetri pada temperatur oksidasi 700°C selarna 5000 menit. Pengujian struktur mikro dan sifat oksida dan pengukuran kekerasan bahan dilakukan dengan uji metalografi, pengujian X-ray Difractometer (XRD) dan uji kekerasan Vickers. Dari pengujian termogravimetri diperoleh penambahan berat sebesar 0,35 mg/cm2, dengan laju oksidasi awal mengikuti kaidah parabola. Foto struktur mikro menunjukkan perubahan bentuk dan ukuran butir dan tebal lapisan oksida 2,3 µm. Kekerasan bahan sesudah oksidasi mengalami penurunan dari 186 menjadi 174 skala Vickers. Hasil pengujian XRD menunjukkan terbentuknya oksida Cr2O3 sebagai lapisan pelindung oksidasi yang mantap dan fasa Cr23C6 yang menjadi penyebab sensitisasi tidak terbentuk. Berdasarkan hasil pengujian dapat disimpulkan bahwa laju oksidasi dan korosi bahan memenuhi persyaratan desain bahan komponen pembangkit energi dalam PLTN maju.
Esterification of Waste Cooking Oil Using Ultrasonic: Kinetic Study Egi Agustian; Jessica Jessica; Pudji Untoro; Anny Sulaswatty
Jurnal Kimia Terapan Indonesia Vol 20, No 2 (2018)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (521.053 KB) | DOI: 10.14203/jkti.v20i2.397

Abstract

Waste cooking oil (WCO) have a great potential as an alternative raw material for producing biodiesel. The literatures kinetic of the esterification of WCO in the presence of phosphoric acid catalyst with ultrasonic assisted are rare and most literatures used conventional method. This study aims to determine the optimum condition and the parameters of first and second order kinetics of the WCO esterification which was assisted by ultrasonic bath. Variables that used in this study are methanol/oil mole ratio, acid catalyst concentration and reaction temperature. The highest conversion was 42.08% with methanol/oil mole ratio of 15:1, a catalyst (phosphoric acid) concentration of 9% wt and temperature of 50oC within 90 minutes. The reaction time was reduced to 3 times (minute) compare to conventional method and fatty acid reduced 42%. Kinetic parameters were calculated with assumption that the esterification was the irreversible reaction. The reaction rate constant increasing with temperature. The value of activation energy for esterification of WCO is 42.94 kJ/mol for first order reaction and 35.30 kJ/mol for second order reaction.
ULTRASONIC TREATMENT EFFECT ON THE CONSOLIDATION OF Fe-Cr PARTICLE MIXTURES AFTER COMPACTION AND SINTERING PROCESS Marzuki Silalahi; Pudji Untoro; Bambang Suharno; Sri Harjanto
Metalurgi Vol 29, No 2 (2014): Metalurgi Vol.29 No.2 Agustus 2014
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (449.765 KB) | DOI: 10.14203/metalurgi.v29i2.289

Abstract

Co-Authors ANNY SULASWATTY B Bandriyana Bambang Sugiono Bambang Suharno Egi Agustian Jessica Jessica Marzuki Silalahi Sri Harjanto