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All Journal Jurnal Pendidikan Teknologi dan Kejuruan Jurnal Sains Materi Indonesia Jurnal Ilmiah Teknik Mesin Poros
Eddy Siradj
Departemen Metalurgi Dan Material, Fakultas Teknik, Universitas Indonesia, Depok 16424, Indonesia
Education Engineering Materials Science & Nanotechnology Mechanical Engineering

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STUDI DIFRAKSI SINAR-X PADUAN Mg-Co-Ni YANG DIBUAT DENGAN METODE PEMADUAN MEKANIK (MECHANICAL ALLOYING) Andon Insani; Hadi Suwarno; Johny Wahyuadi; Wisnu Ari Adi; Eddy S. Siradj
Jurnal Sains Materi Indonesia EDISI KHUSUS: OKTOBER 2006
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (339.918 KB) | DOI: 10.17146/jusami.2006.0.0.4937

Abstract

STUDI DIFRAKSI SINAR-X PADUAN Mg-Co-Ni YANG DIBUAT DENGAN METODE PEMADUAN MEKANIK. Telah dilakukan pembuatan paduan Mg-Co-Ni berskala nano sebagai bahan penyerap hidrogen dengan metode pemaduan mekanik. Paduan dibuat dari serbuk logam magnesium, kobalt dan nikel murni dengan menggunakan SPEX 8000 High Energy Milling (HEM). Vial dan bola yang digunakan terbuat dari bahan SS. Rasio berat bola terhadap sampel (B/S) yang digunakan adalah 1:1. Intensitas puncak-puncak difraksi dan fraksi volume dari Mg berkurang dengan bertambahnya waktu milling, yang disebabkan terbentuknya fasa amorf MgO, MgNi2 dan Mg. Perubahan fraksi volume yang cukup signifikan terjadi pada Mg dari 62,52 % pada 0 jam menjadi 23,91 % pada 40 jam, sedangkan Co dan Ni berubah berturut-turut dari 7,63 % ke 8,61 % dan dari 25,23 % ke 31,24 %. Kecuali Mg, parameter kisi Co dan Ni relatif stabil. Sedangkan ukuran kristal berkurang dengan bertambahnya waktu milling, yaitu Mg dari 29,7 nm pada 0 jam menjadi 6 nm pada 40 jam, Co dari 11 nm menjadi 9,8 nm dan Ni dari 24,5 nm menjadi 22,8 nm. Tetapi paduan Mg3CoNi2 yang diinginkan belum terbentuk yang kemungkinan disebabkan oleh rendahnya energi tumbukan.
THE EFFECT OF LI2O ONCOMPOSITE LTAP AND WINDOWS GLASSES Bambang Prihandoko; Priyo Sardjono; Anne Zulfia; Eddy Siradj
Jurnal Sains Materi Indonesia Vol 9, No 1: OKTOBER 2007
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (454.844 KB) | DOI: 10.17146/jusami.2007.9.1.4828

Abstract

THE EFFECT OF LI2O ONCOMPOSITE LTAP AND WINDOWS GLASSES. Research on The Effect of Li2O on Composite LTAP and Windows Glasses have been done. Windows glasses contain of SodiumLime Silica Glasses and Na2O 11,6%, CaO 8,1%and SiO2 58,7%. LTAP ( Lithium Titanium Alumunium Phosphate ) material mixed in the slurry of powder windows glasses with composition of weight procentage 75%. The temperatures process for sintering of samples is above of glass transition at 600 oC. Then samples quenched with liquid nitrogen. The variation of Li2O addition on samples are 0, 2,5, 5 and 7,5% weight. XRD pattern of all samples has a same phenomenon of crystallization phases, i.e. LTAP with lithium silica from Li5Si2O7, Li2SiO3, Li4SiO4 and Li2Si2O5. Optimum addition oh Li2O is 7,5% weight Li2O that gift a conductivity of 1,479 x 10-7 S/cm and high value on density and smallest porosity
Failure Analysis of ICDP Work Roll of Hot Strip Mill: Case Study of Shell-Core Interface Spalling Ridwan Setiawan; Eddy S Siradj; Fauzul Iman
Jurnal Pendidikan Teknologi Kejuruan Vol 5 No 1 (2022): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v5i1.27023

Abstract

The failure of the roll during the rolling process causes cobble to lose production time for several hours. Investigations include visual inspection, lltrasonic test, chemical analysis, metallography, and hardness measurement. Stand finishing F1-F4 uses High Chrome (HCr) material type, while Stand F5-F6 uses ICDP material type. Spalling work roll occurs on stand F5 with Roll Top position. Roll was chipped between shell and core with an exfoliation percentage of 30% of the roll surface area. Visually, the chipped part looks smooth and even. Thus no typical sign of fatigue or brittle failure was observed. The chemical composition of the roll conforms to the standard. Roll surface hardness that does not experience spalling follows the standard. The metallography analysis found micro-cracks in the spalled samples and inclusions in the form of scale in the shell-core interface. Based on the study, it can be concluded that the spalling roll is caused by poor bonding of the shell and core on the roll.
Pengaruh Proses Rolling terhadap Struktur Mikro dan Sifat Mekanis pada Kuningan setelah diproses ecap Julyadi Julyadi; Suryadi Suryadi; Erwin Siahaan; Eddy S. Siradj
Jurnal Ilmiah Teknik Mesin POROS Vol 12, No 2 (2014): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (683.807 KB) | DOI: 10.24912/poros.v12i2.169

Abstract

Abstract: Brass material widely used in industry because it has the advantage of being a metal that resists corrosion, has high ductility, good toughness and easy on the form. This study was conducted to determine the effect of rolling process on mechanical properties and microstructure of metal brass after ECAP process on brass (CuZn) 70/30. The initial step is to make the specimens with a diameter of 10 mm and height 80 mm has been done annealing 600 ° C with a hold time of 90 minutes. Then a ECAP 3-pass process and cold rolling process. To determine the mechanical properties of tensile test specimens and hardness test) and metallographic observations to determine the microstructure. The results after the execution of the research note that the specimen after passing through annealing process, ECAP and rolling have a higher hardness. Prior to treatment the specimen hardness value is 78 VHN and after treatment to 252 VHN hardness value. Metallographic observations of known properties of brass increasingly refined microstructure and grain boundary between micro become increasingly tight.
Co-Authors Andon Insani Anne Zulfia Bambang Prihandoko Dedi Supriadi Erwin Siahaan Fauzul Iman Hadi Suwarno Iwan Setyadi Julyadi Julyadi Priyo Sardjono Ridwan Setiawan Sudarsono, Johny Wahyuadi Suryadi Suryadi Wisnu Ari Adi