scholarly journals PELAPISAN PERMUKAAN BAJA TAHAN KARAT AISI 304 DENGAN KHROM OKSIDA MENGGUNAKAN METODA SPUTTERING

2019 ◽  
Vol 25 (2) ◽  
Author(s):  
Sungkono Sungkono ◽  
Jan Setiawan ◽  
Isfandi Isfandi ◽  
Ikhwanul Azis
Keyword(s):  
Base Metal ◽  
Aisi 304 ◽  
X Ray ◽  
Dc Sputtering ◽  
Ss 304

PELAPISAN PERMUKAAN BAJA TAHAN KARAT AISI 304 DENGAN KHROM OKSIDA MENGGUNAKAN METODE SPUTTERING. Baja tahan karat digunakan sebagai bahan struktur reaktor daya tipe LWR, AGR dan LMFBR. Permasalahan bahan struktur yang timbul adalah ketahanan korosi rendah dan swelling dalam lingkungan iradiasi tinggi. Salah satu cara yang digunakan adalah melapisi permukaan kelongsong baja tahan karat dengan khrom oksida. Tujuan penelitian adalah mendapatkan karakter mikrostruktur, kekerasan mikro, dan senyawa yang terbentuk pada lapisan permukaan baja tahan karat AISI 304. Metode  yang digunakan adalah pelapisan permukaan SS 304 dengan metode DC-sputtering. Proses pelapisan menggunakan bahan pelapis berupa target khrom, argon sebagai gas sputter, yang didoping gas oksigen dengan konsentrasi bervariasi dari 0 – 50 %volume, arus 10 – 20 mA, dan waktu 1 - 3 jam. Karakterisasi lapisan meliputi pengamatan mikrostruktur menggunakan mikroskop optik, kekerasan dengan microhardness Vickers tester, dan senyawa dalam lapisan dengan X-ray difractometer. Hasil penelitian menunjukkan bahwa mikrostruktur base metal tersusun dari fasa austenit dan endapan karbida, antarmuka logam-lapisan terlihat jelas, serta lapisan kompak dan homogen dengan ketebalan cenderung naik dalam rentang   0 – 30 %volume, menurun pada 30 – 40 %volume, dan bertambah tebal pada 40 – 50 %volume gas O2  Kekerasan lapisan bertambah tinggi hingga doping gas oksigen 30 %volume, kemudian menurun hingga 50 %volume gas O2. Pada konsentrasi dopan tetap dengan arus 10 – 20 mA dan waktu proses 1 – 3 jam diketahui kekerasan lapisan permukaan SS 304 bertambah tinggi seiring dengan bertambah besarnya arus dan waktu sputtering. Pada konsentrasi dopan 30 %volume O2, arus 10 mA dan waktu 2 jam, lapisan yang terbentuk mengandung CrO2 Kata kunci: Karakterisasi, lapisan permukaan, bahan struktur, SS 304, mikrostruktur, kekerasan, senyawa lapisan.

scholarly journals Analisis Radiografi Sinar-X Terhadap Sambungan Pelat Baja Tahan Karat Aisi 304 Hasil Pengelasan Tungsten Inert Gas Dengan Arus 40–60 Ampere

2021 ◽  
Vol 6 (2) ◽  
pp. 12-22
Author(s):  
Ahmad Zayadi ◽  
Sungkono ◽  
Cahyono HP
Keyword(s):  
Welded Joints ◽  
Steel Plate ◽  
Butt Joint ◽  
304 Stainless Steel ◽  
Machine Construction ◽  
Aisi 304 ◽  
X Ray ◽  
Ss 304 ◽  
A Current

X-Ray Radiographic Analysis of Aisi 304 Stainless Steel Plate Joints From Inert Gas Tungsten Welding Results with 40 – 60 Ampere Current. Metal welding process is one of the main processes in machine construction. The quality of welded joints determines the strength and toughness of a machine construction. The quality of welded joints of installed construction can be determined by the non-destructive test method using X-ray radiography equipment. This study aims to obtain a butt joint obtained from TIG welding of AISI 304 stainless steel plate with a current of 40 - 60 A, identification of defects in the 1G butt joint, and analysis of the quality of the weld joint. The research method used is testing of welded joints using X-ray radiography which refers to the ASME V article II standard and the connection quality refers to ASME section IX. The results showed that TIG welding with a current of 60 Ampere produced a butt joint butt joint that was penetrated and there was no gap between the plates, whereas with a current of 40 A and 50 A the weld joint was not see-through but there was still a gap between the plates. Incomplete penetration weld defects were found in the welded SS 304 plate joints with a current of 40 A. Welded porosity defects were found in the welded SS 304 plate joints with a current of 50 A. Weld defects were not found in the SS 304 plate joints with a current of 60 A. Butt joint connections TIG welded SS 304 plate with the best current of 60 A compared to the current of 40 A and 50 A.

YBa2Cu3O7-δ/La0.7Ca0.3MnO3 BILAYERS: STRUCTURAL AND TRANSPORT PROPERTIES

2005 ◽  
Vol 19 (01n03) ◽  
pp. 491-493
Author(s):  
A. DE SANTIS ◽  
F. BOBBA ◽  
M. SALVATO ◽  
A. M. CUCOLO ◽  
A. VECCHIONE
Keyword(s):  
Transition Temperature ◽  
Structural Characterization ◽  
Outer Layer ◽  
Superconducting Transition ◽  
X Ray ◽  
Dc Sputtering ◽  
High Oxygen Pressure ◽  
Topmost Layer ◽  
High Degree

We report on the preparation and the structural characterization of both YBa 2 Cu 3 O 7-δ/ La 0.7 Ca 0.3 MnO 3 and La 0.7 Ca 0.3 MnO 3/ YBa 2 Cu 3 O 7-δ bilayers grown onto (100) SrTiO3 substrates. The samples have been realized by sequential dc sputtering processes in high oxygen pressure starting from stoichiometric targets. The X-ray diffractograms and ϕ-scan reveal a high degree of epitaxiality of the heterostructures. In the case of YBa 2 Cu 3 O 7-δ topmost layer, we have found a superconducting transition temperature T c of about 84 K while this is highly depressed when La 0.7 Ca 0.3 MnO 3 is deposited as outer layer. These last structures recover a higher T c when a long annealing is carried out at T =560° C .

Electrochemical Characterization of Metal Oxynitride Thin Film as New Lithium Storage Materials

2011 ◽  
Vol 295-297 ◽  
pp. 912-916 ◽  
Author(s):  
Yong Ning Zhou ◽  
Zheng Wen Fu
Keyword(s):  
Thin Film ◽  
Reaction Mechanism ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Reaction ◽  
Annealing Process ◽  
Lithium Storage ◽  
X Ray ◽  
Dc Sputtering ◽  
Selected Area Electron Diffraction

Metal oxynitride (VxON, CrxON) thin film has been fabricated by reactive dc sputtering method and annealing process. Its electrochemical properties are investigated in a MxON/Li cell. The reversible specific capacities are around 830 mAh g-1 for VxON and 730 mAh g-1 for CrxON. By using selected-area electron diffraction and X-ray photoelectron spectroscopy measurements, New electrochemical reaction mechanism is uncovered, which should be responsible for its good electrochemical performance.

The Welding Residual Stress Analysis on High Performance Bridge Steel with Different Testing Method

2014 ◽  
Vol 989-994 ◽  
pp. 883-886
Author(s):  
Huan Xue ◽  
Rong Feng Li ◽  
Li Yu ◽  
Dong Liu ◽  
Wen Jie Peng
Keyword(s):  
Residual Stress ◽  
Base Metal ◽  
High Performance ◽  
Hole Drilling ◽  
Indentation Method ◽  
X Ray ◽  
Hole Drilling Method ◽  
Bridge Steel ◽  
Drilling Method ◽  
Welding Line

The residual stress on X groove welding plate of high performance bridge steel 4MnNbq is analyzed. The X-ray diffraction method, hole drilling method and indentation method are respectively used to test the residual stress on welding line, heat-affected zone and base metal. The longitudinal and transversal residual stress are analyzed and compared. The results show that the stress along welding line direction is far larger than the transversal one and the stress on base metal are comparatively smaller than the welding line. The testing results of three methods match well, while the results of X-ray method and hole drilling method are much closer, the relative error of indentation method is comparatively larger.

Fabrication and characterization of multilayer supermirrors for hard X-ray optics

1998 ◽  
Vol 5 (3) ◽  
pp. 711-713 ◽  
Author(s):  
K. Yamashita ◽  
K. Akiyama ◽  
K. Haga ◽  
H. Kunieda ◽  
G. S. Lodha ◽  
...  
Keyword(s):  
Energy Band ◽  
Incidence Angle ◽  
Grazing Angle ◽  
Float Glass ◽  
Optical Systems ◽  
X Ray ◽  
Dc Sputtering ◽  
Fabrication And Characterization ◽  
Sputtering System

Multilayer supermirrors stacked with three sets of Pt/C combinations have been fabricated on a flat float-glass and conical replica foil mirror using a magnetron DC sputtering system, and applied to X-ray optical systems in the hard X-ray region. The design of the supermirror is optimized to obtain the highest integrated reflectivity in the energy band and at the grazing angle concerned. X-ray reflectivities of 30% in the 25–35 keV band at an incidence angle of 0.3° were obtained.

scholarly journals X-Ray Diffraction Study of Amorphous CeFe2H3 and GdFe2H3 Alloys Produced by Hydrogenation

1987 ◽  
Vol 42 (6) ◽  
pp. 582-586 ◽  
Author(s):  
E. Matsubara ◽  
Y. Ohzora ◽  
Y. Waseda ◽  
K. Aoki ◽  
K. Fukamichi ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Structural Features ◽  
High Rate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dc Sputtering

The structure of amorphous CeFe2H3 and GdFe2H3 alloys produced by hydrogenation is investigated and compared with that of amorphous CeFe2 and GdFe2 produced by high-rate DC sputtering. Distinct different structural features, characterized by an almost resolved first peak of the RDF of the former were found.

Corrosion Behaviour of AISI 304 Stainless Steel with Solar Salt Heat Transfer Fluid

2014 ◽  
Vol 922 ◽  
pp. 13-17 ◽  
Author(s):  
Omar Ahmed ◽  
Le Zhou ◽  
Nahid Mohajeri ◽  
Yong Ho Sohn
Keyword(s):  
Heat Transfer ◽  
Stainless Steel ◽  
Iron Oxide ◽  
Corrosion Behavior ◽  
304 Stainless Steel ◽  
Salt Mixture ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Solar Salt ◽  
X Ray

In an effort to understand the compatibility between the heat transfer medium and the structural materials used in concentrated solar power plants, the corrosion behavior of AISI 304 stainless steel (18 wt.% Cr, 8 wt.% Ni) in a molten solar salt mixture (53 wt. % KNO3, 40 wt. % NaNO2,7 wt. % NaNO3) has been investigated. The 304 stainless steel coupon samples were fully immersed and isothermally exposed to solar salt at 530°C for 250, 500, and 750 hours in air. X-ray diffraction and scanning electron microscopy with X-ray energy-dispersive spectroscopy were employed to examine the extent of corrosion and identify the corrosion products. Oxides of iron were found to be the primary corrosion products in the presence of the molten alkali nitrates-nitrite salt mixture because of the dissolution of the protective chromium oxide (Cr2O3) scale formed on 304 stainless steel coupons. The corrosion scale was uniform in thickness and chromium-iron oxide was found near the AISI 304. This indicates that the scale formed, particularly on the upper layer with presence of sodium-iron-oxide is protective, and forms an effective barrier against penetration of fused solar salt. By extrapolation, annual corrosion rate is estimated to reach 0.784 mils per year. Corrosion behavior of AISI 304 stainless steel is discussed in terms of thermodynamics and reaction paths.

The On-Stream X-Ray Analysis of Slurries for Process Control

1991 ◽  
Vol 35 (A) ◽  
pp. 661-672
Author(s):  
Johann P. Engelbrecht ◽  
Johan P.R. de Villiers ◽  
Stefan W. de Bruyn
Keyword(s):  
Process Control ◽  
Base Metal ◽  
Pyrolytic Graphite ◽  
Xrd Analysis ◽  
Detector System ◽  
Energy Dispersive ◽  
Heavy Minerals ◽  
Handling System ◽  
X Ray

AbstractAn integrated XRD-XRF system for the on-stream analysis of slurries was configured to the requirements of industry for process control. The slurry-handling system includes a multiplexer, header tank, de-aerator and a windowless sample presenter. The XRD part of the system is composed of a molybdenum anode X-ray tube, a pyrolytic graphite primarybeam monochromator, a vertical fixed-geometry goniometer, and a simultaneous detector system. The X-ray beam is transmitted through the slurry curtain so that the diffracted intensities are measured in the forward diffracted mode. The energy-dispersive XRF spectrometer measures the reflected fluorescence intensities. Examples and data from the onstream XRD analysis of fluorspar and apatite are presented. Mention is made of the application of an integrated XRD-XRF system in the heavy-minerals and base-metal industries.

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