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All Journal Telaah Science and Technology Indonesia Teknologi Indonesia Metalurgi Metalurgi
Toto Sudiro
Lembaga Ilmu Pengetahuan Indonesia (LIPI)
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Energy Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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Journal : Teknologi Indonesia

 1 
STRUCTURE AND HARDNESS CHARACTERISTICS OF 50Cr-50Al COATING PREPARED BY A MECHANICAL ALLOYING TECHNIQUE: EFFECTS OF HEAT TREATMENT TEMPERATURE Sudiro, Toto; Sebayang, Perdamean
Teknologi Indonesia Vol 38, No 3 (2015)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v38i3.247

Abstract

In the present work, a mechanical alloying technique was used to prepare 50Cr-50Al (in atomic, at %) coating on the surface of low carbon steel. The coated samples were then annealed in a vacuum at elevated temperatures of 600, 700, 800, and 900C for 2h, separately. The effects of annealing temperature on the structure characteristic of 50Cr-50Al coating were studied by XRD and SEM-EDX, and coating hardness was measured by micro-Vickers hardness test. The results showed that the annealing process led to the formation of inter-metallic phases and interdiffusion of Fe element from the substrate and Cr, Al elements from the coating, depending on annealing temperature. As annealing temperature increased to 900C, however, X-ray diffraction analysis indicated the formation of Al2O3. Meanwhile, the hardness of cross-sectional of coating increased after annealing at 600C. The coating hardness decreased as annealing temperatures increased.
THE EFFECT OF ZnO ADDITIVE ON PHYSICAL PROPERTIES AND MICROSTRUCTURE OF BaFe12O19 MAGNETIC MATERIAL Sebayang, Perdamean; Sudiro, Toto; Aryanto, Didik; Nugraha, Endra
Teknologi Indonesia Vol 39, No 2 (2016)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v39i2.265

Abstract

Preparation of BaFe 12 O 19 powder containing varying amount of ZnO as 5, 10, 15 and 20 % by mass were prepared by a high energy milling (HEM) for 1 hour and compacted into a pellet using 80 kgf/cm 2 in compressive pressure. The samples were sintered at elevated temperatures of 800 and 1,000 o C for 2 hours, separately. The characterization results indicated that BaFe 12 O 19 -10 mass % ZnO exhibits excellent in physical and magnetic properties that can be potentially used for recording media and microwave absorbing material applications.
Co-Authors Aji, Mahardika P Bambang Hermanto Didik Aryanto Dwi Nanto, Dwi Ginting, Dianta Hastuti, Ema Husniya, Naimatul Kemas Ahmad Zaini Thosin Khoirun Nisa Lusita Lusita Mashadi Muljadi Muljadi Nugraha, Endra Nurlela, Ai Perdamean Sebayang Priyo Sardjono Resetiana Dwi Desiati, Resetiana Dwi Rhye, Jong-Soo Riser Fahdiran Sutiawan, Edi Tony Kristiantoro, Tony