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Evaluation on the Temperature and Calcination Time During Sol-gel Coating of TiO2 on Iron Foam substrate Ramdan, Raden Dadan; Haris, Luqman; Hermawan, Hendra; Sunendar, Bambang
Mesin Vol 26, No 1 (2017)
Publisher : Mesin

Iron foam is iron based material which is widely applied due to its unique properties. However since corrosion is also a problem for this material, coating with innert material is required in enhancing its applications. In the present research, TiO2 coating is performed on iron foam suface by sol-gel dipping method. Focus is given on the study of the effect of calcinations temperature and time on the coating characteristics. TiCl4 is used as the precursor with concentration of 0.3 M, added with 1M HCl solution and chitosan soluation with concentration of 1%. Calcination is performed at temperature of 400, 500 dan 600oC and calcinations time of 1 and 3 hours inside controlled gas furnace using nitrogen atmosphere. Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) characterization data shows that TiO2 particles form on the iron foam substrate. SEM characterization on the sample heated at 400oC and heating time of 1 hour shows the formation of nano particle titania (0.06 Î¼m) which is homogeneously distributed with less agglomeration than others and considered as the best sample in the present research. As the temperature and time of calcinations increase, more inhomogeneous particle distribution and bigger particles form.

The Effect of Substrate Pre-treatment on Hydroxy-apatite Coated Titanium Alloy by High-velocity Oxy-fuel Process Raden Dadan Ramdan; Budi Prawara; Rochim Suratman; Ferdian Marta; Ali Rinaldi
JURNAL MECHANICAL Vol 8, No 1 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v8.i1.201701

In order to fully meet bio-compatibility requirement of titanium alloy as implant material, coating with hydroxyapatite (HA) is normally applied. The present research concerns on the effect of substrate pre-treatment on the coating of HA on titanium alloy by high-velocity oxy fuel process (HVOF). Before the coating, all samples were pre-treated by thermo-mechanical treatment in order to obtain fine grain structure. Three type of substrate pre-treatment is then applied on different substrates, including, sand-blasting, sand-blasting+etching, and sand-blasting+etching+CNT intermediate layer. After coating, post-annealing treatment was applied on each sample and characterization was performed on the sample after the treatment. It was obtained that the sand-blasted sample has relatively rougher surface (SEM observation), lower degree of crystallinity (XRD characterization) and higher residual strain (XRD data calculation by Mud Master software) as compared with other samples. From FTIR characterization it can be obtained that all samples show no differences in orbital function.

Evaluation on the Temperature and Calcination Time During Sol-gel Coating of TiO2 on Iron Foam substrate Raden Dadan Ramdan; Luqman Haris; Hendra Hermawan; Bambang Sunendar
Mesin Vol. 26 No. 1 (2017)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2017.26.1.1

Iron foam is iron based material which is widely applied due to its unique properties. However since corrosion is also a problem for this material, coating with innert material is required in enhancing its applications. In the present research, TiO2 coating is performed on iron foam suface by sol-gel dipping method. Focus is given on the study of the effect of calcinations temperature and time on the coating characteristics. TiCl4 is used as the precursor with concentration of 0.3 M, added with 1M HCl solution and chitosan soluation with concentration of 1%. Calcination is performed at temperature of 400, 500 dan 600oC and calcinations time of 1 and 3 hours inside controlled gas furnace using nitrogen atmosphere. Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) characterization data shows that TiO2 particles form on the iron foam substrate. SEM characterization on the sample heated at 400oC and heating time of 1 hour shows the formation of nano particle titania (0.06 Î¼m) which is homogeneously distributed with less agglomeration than others and considered as the best sample in the present research. As the temperature and time of calcinations increase, more inhomogeneous particle distribution and bigger particles form.

A Review on Measurement Methods for Machining Induced Residual Stress Kushendarsyah Saptaji; Siti Nur Afiqah; Raden Dadan Ramdan
Indonesian Journal of Computing, Engineering, and Design (IJoCED) Vol. 1 No. 2 (2019): IJoCED
Publisher : Faculty of Engineering and Technology, Sampoerna University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35806/ijoced.v1i2.64

The chip formation in mechanical machining / cutting process involves thermal loading and mechanical loading in the form of large plastic deformations, high strain, strain rates and high temperatures in the cutting zone. These loadings usually induce plastic deformation in the form of residual stresses in the surface and sub-surface of the machined workpiece. Residual stress issue is essential to be studied in order to control the quality and fatigue life of a component or part produced by machining process. Therefore, the magnitude and depth of the residual stresses into the workpiece sub-surface is important and necessary to be measured. The objective of this paper is to discuss various study on the effects of machining parameters on residual stress and residual stress measurement methods for machined workpiece namely non-destructive, semi-destructive and destructive methods. In addition, the effect of machining process into the metallurgical conditions of the workpiece in the form of microstructural changes is also discussed.

EFFECT OF NIOBIUM ADDITION ON THE ELECTROCHEMICAL AND MECHANICAL PROPERTIES OF TITANIUM ALLOYS AS BIOMATERIALS Dipodiwiryo, Adam Arlei; Djoko Hadi Prajitno; Raden Dadan Ramdan; Riza Wirawan
Journal of Innovation Research and Knowledge Vol. 4 No. 5: Oktober 2024
Publisher : Bajang Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53625/jirk.v4i5.8694

Titanium is a metal known for its high strength, lightweight, and excellent corrosion resistance, making it widely used as a biomaterial in medical applications. To further enhance these properties, particularly corrosion resistance and mechanical strength, niobium (Nb) was added to titanium-aluminum (Ti-Al) alloys. In this study, three alloy compositions, Ti-5Al-10Nb, Ti-5Al-8Nb, and Ti-5Al-6Nb, were fabricated using the Electric Arc Furnace (EAF) method. After the melting process, the specimens were characterized using Scanning Electron Microscopy (SEM) combined with Energy Dispersive Spectroscopy (EDS) to analyze the microstructure and alloying element distribution. X-Ray Diffraction (XRD) was employed to identify the crystalline phases formed in the alloys. Electrochemical testing was performed using the Tafel polarization method to measure corrosion rates, while mechanical testing was conducted using the Vickers hardness test to determine material hardness. The results showed that increasing niobium content in the titanium alloy significantly improved the corrosion resistance and hardness of the specimens. The Ti-5Al-10Nb specimen exhibited the lowest corrosion rate and highest hardness compared to the other specimens. These findings suggest that the addition of niobium can enhance the performance of titanium alloys as biomaterials, particularly for hip joint implant applications.

Pengaruh Proses Solution Treatment dan Shot Peening Terhadap Kekuatan Mekanik dan Struktur Mikro Baja Mangan Austenitik Untuk Komponen Frognose Rel Wahyu, Wahyu Tian; Ramdan, Raden Dadan
SPECTA Journal of Technology Vol. 9 No. 3 (2025): Specta Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v9i3.952

Wessel is a part of the railway track which functions as track switching. One of the components of Wessel, which is made through the casting process is called frognose. Frognose is the most critical component in the Wessel crossing, as it must withstand the impact load caused by the movement of train wheels. The production of frognose follows the EN 15689 standard and the Minister of Transportation Regulation of the Republic of Indonesia No. 60 of 2012. Austenitic manganese steel ASTM A 128 Grade C is chosen as the main material. This austenitic manganese steel has high-strain hardening properties when subjected to static, dynamic, and impact loads on its surface. In this study, a heat treatment process is used to improve the mechanical properties and carbide solubility of the casting results. Cooling the object from the casting process causes carbide growth which is caused by the cooling rate. Therefore, solution treatment is necessary to dissolve the carbides. The solution treatment process is carried out at various temperatures 1075ºC, 1150ºC, and 1225ºC. Subsequently, the optimized material from the solution treatment is subjected to shot peening deformation. Based on the research results, the solution treatment process at 1150ºC temperature shows the best toughness, thus it will be continued with the shot peening deformation process. The deformation caused by the shot peening process is able to change the crystal orientation by forming twinning, thereby increasing the material hardness value. The best mechanical properties are obtained in sample ST2 followed by the SP12 process with a combination of hardness value of 35 HRC at a depth of 0.05mm; impact energy of 82,92 joule/cm2 and mostly carbide-free microstructure.

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