Investigation of Thermal Sprayed Stainless Steel/WC-12wt%Co Nanocomposite Coatings

2011 ◽  
Vol 695 ◽  
pp. 441-444 ◽  
Author(s):  
Chaiyasit Banjongprasert ◽  
Piyaporn Jaimeewong ◽  
Sukanda Jiansirisomboon
Keyword(s):  
Stainless Steel ◽  
Steel Powder ◽  
Industrial Applications ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Cross Sectional ◽  
X Ray ◽  
Spray Coatings ◽  
Wide Range

The thermal spray coatings of stainless steel with nano-sized particles as reinforcement have been studied. Stainless steel powder mixed with 0, 2.5, 5 and 10 wt% WC-12wt%Co nano-sized powder was flame sprayed. The presence of WC-12wt%Co nano-particles in mixed powders as feedstock was confirmed. The microstructure of the coatings has been investigated using a wide range of characterization techniques: optical microscopy with image analysis, X-ray diffraction (XRD), and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) to understand the microstructure evolution. Chemical composition and microstructure of the coatings showed that the coatings contained stainless steel, WC, Co, and oxide layers. The addition of WC-12wt%Co increased cross-sectional hardness, reduced porosity and friction coefficient. The improved wear properties demonstrate a high potential for industrial applications of stainless steel/WC-12wt%Co coatings.

AISI 310 Stainless Steel Formed by Gelcasting: An Alternative Manufacturing Method

2020 ◽  
Vol 1012 ◽  
pp. 325-330
Author(s):  
Louise Fernanda Rodrigues Oliveira ◽  
Mauricio David Martins das Neves ◽  
Fernando dos Santos Ortega
Keyword(s):  
Stainless Steel ◽  
Yield Strength ◽  
Room Temperature ◽  
Steel Powder ◽  
Vertical Axis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Manufacturing Method ◽  
310 Stainless Steel ◽  
Single Batch

This work evaluates the microstructure and the yield strength under compression at room temperature and at 800°C of specimens prepared with AISI 310 stainless steel powder (D50 = 10 μm), manufactured by gelcasting. Parts were vacuum sintered in a single batch at 1280°C. At room temperature, specimens presented average yield strength of 270 MPa, and at 800°C, 105 MPa. Microstructure analysis involved the measurement of grain size along the vertical axis of cylindrical specimens, with special attention to the effect of particles settling, and was conducted using scanning electron and optical microscopy, and X-ray diffraction. Settling effect was assessed considering the position where the specimen was taken and was negligible: both density and yield strength did not vary significantly along the vertical axis.

An X-ray Photoelectron Spectroscopie Study of B-N-Ti system

1997 ◽  
Vol 472 ◽  
Author(s):  
Sudipta Seal ◽  
Tery L. Barr ◽  
Natalie Sobczak ◽  
Ewa Benko ◽  
J. Morgiel
Keyword(s):  
Photoelectron Spectroscopy ◽  
Industrial Applications ◽  
General Interest ◽  
X Ray Diffraction ◽  
Cross Sectional ◽  
X Ray ◽  
Transmission Electron ◽  
Wear And Corrosion ◽  
Interfacial Growth ◽  
Wear And Corrosion Resistance

ABSTRACTComposite nitrides (such as BN, TiN) are widely used in various industrial applications because of their extreme wear and corrosion resistance, thermal and electrical properties. In order to obtain composite materials with mese optimal properties, it is important to elucidate whether any chemical reactions occur at nitride/metal interfaces, e.g., those involving BN-Ti/TiN. Materials of interest include the deposition by PVD of Ti and TiN on BN substrates. Some of these systems were then subjected to varying degrees of physical and thermal alteration. Detailed X-ray photoelectron spectroscopy (XPS) has merefore been rendered of these interfaces using cross-sectional display and sputter etching. Resulting structural and morphological features have been investigated with transmission electron microscopy (TEM) and X-ray diffraction (XRD). Diffusion of the nitridation, oxynitride formation and interfacial growth are of general interest.

Corrosion Behavior of Fe-12Cr-2Mo Stainless Steel in Na2SO4-50%NaCl with Flowing Ar-20%O2 Environments at High Temperature

2015 ◽  
Vol 1107 ◽  
pp. 727-732
Author(s):  
Muhamad Izhar Sahri ◽  
Norinsan Kamil Othman ◽  
Abdul Razak Daud ◽  
Azman Jalar
Keyword(s):  
Stainless Steel ◽  
Electron Microscope ◽  
High Temperature ◽  
Chromium Concentration ◽  
Oxide Scales ◽  
X Ray Diffraction ◽  
Salt Mixture ◽  
Cross Sectional ◽  
X Ray ◽  
Scanning Electron

The behavior of Fe-12Cr-2Mo stainless steel exposed isothermally in tube furnace at 700°C for 10 h had been studied in different environments; of mixed environment (Ar-20%O2 with coated Na2SO4-50%NaCl salts), molten salt (Na2SO4-50%NaCl) and dry oxygen (Ar-20%O2) atmospheres. The exposed samples were characterized by using optical microscopy (OM), scanning electron microscope (SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD). The results indicated that, sample exposed in mixed environments undergoes highest corrosion rate compared with other samples. The main phase exists in all samples generally were iron-rich oxides which non-protective and thick. Conversely, EDX analysis on cross-sectional samples revealed the Cr-enrichment developed underneath the iron-rich oxide scales as the chromium concentration increases towards near the substrate. In presence of salt mixture, the oxide scales undergo spallation, however there is no crack observed. The catastrophic corrosion sample was occurred in combined environment due to the oxidation induced by the chloridation and sulfidation phenomena as well.

scholarly journals Low-Cost Synthesis and Characterization of Silver Nanoparticles for Diverse Sensing Application

2019 ◽  
Vol 9 (2) ◽  
pp. 3915-3917
Author(s):  
S. Akhtar ◽  
Z. Farid ◽  
H. Ahmed ◽  
S. A. Khan ◽  
Z. N. Khan
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Reduction ◽  
Low Cost ◽  
Industrial Applications ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
X Ray ◽  
Wide Range ◽  
Range Of Functions

Silver (Ag) nanoparticles (NPs) are synthesized and characterized by a low-cost chemical reduction method. Silver nanoparticles (Ag NPs) have pre-occupied the consideration of the scientific community due to their wide range of functions, utility and industrial applications, particularly in the fields of sensing technologies and medicine (particularly their efficiency against microbes, the ability of healing the wound and anti-inflammatory properties). Ag NPs are synthesized by a low-cost fabrication method. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray diffraction (EDX) and photometry techniques are used in this work to identify their nature and potentiality for diverse applications in sensing technologies.

Quantitative X-Ray Diffraction From Superlattices

MRS Bulletin ◽  
1992 ◽  
Vol 17 (12) ◽  
pp. 33-38 ◽  
Author(s):  
Eric E. Fullerton ◽  
Ivan K. Schuller ◽  
Y. Bruynseraede
Keyword(s):  
Physical Properties ◽  
Giant Magnetoresistance ◽  
Growth Conditions ◽  
Antiferromagnetic Coupling ◽  
X Ray Diffraction ◽  
Entire Cross Section ◽  
Cross Sectional ◽  
X Ray ◽  
Superlattice Structure ◽  
Wide Range

The physical properties of superlattices have been the subject of considerable interest because a wide range of phenomena associated with very thin films, interfaces, and coupling effects can be studied. Recent areas of activity in metallic superlattices include antiferromagnetic coupling of ferromagnetic layers across nonmagnetic spacer layers, giant magnetoresistance, magnetic surface anisotropy, low-dimensional superconductivity, and anomalous mechanical properties. All of these phenomena are strongly affected by the chemical and physical properties of the individual layers and by the superlattice structure. Therefore, a detailed understanding of the properties of superlattices requires a nondestructive, quantitative determination of the superlattice structure.Because superlattices are not in thermodynamic equilibrium, their structure is sensitive to preparation methods and growth conditions. A dramatic example of superlattice structural dependence on growth conditions is shown in Figure 1, for sputtered Nb/Si superlattices. Increasing the Ar pressure during sputtering decreases the kinetic energy of the deposited atoms, thereby changing their surface mobility, and thus altering growth dynamics. Figure 1 shows the low-angle x-ray diffraction and cross-sectional transmission electron microscopy (TEM) images of [Nb(35 Å)/Si(25 Å)]40, superlattices sputtered in, respectively, 3 and 15 mTorr of Ar. The TEM image of the 3 mTorr superlattice clearly shows the smooth and continuous layering across the entire cross section of the image (≈5 μm). This is characteristic of sputtered metal/semiconductor superlattices used for x-ray optics.

Crystal Structure of Non-Doped and Sn-Doped α-(GaFe)2O3 Thin Films.

2013 ◽  
Vol 1494 ◽  
pp. 147-152 ◽  
Author(s):  
Kentaro Kaneko ◽  
Kazuaki Akaiwa ◽  
Shizuo Fujita
Keyword(s):  
Thin Films ◽  
Chemical Vapor ◽  
Columnar Structure ◽  
Chemical Vapor Deposition Method ◽  
X Ray Diffraction ◽  
Cross Sectional ◽  
X Ray ◽  
Sn Doping ◽  
Sapphire Substrates ◽  
Wide Range

ABSTRACTCorundum structured α-(GaFe)2O3 alloy thin films were obtained on c-plane sapphire substrates by the mist chemical vapor deposition method. Wide range of X-ray diffraction 2θ/θ scanning measurements indicated that these crystals were epitaxially grown on c-plane sapphire substrates and these are no other crystal oriented phase. The cross-sectional and plane-view transmission electron microscope images showed the growth along the c-axis of α-(GaFe)2O3 thin films on sapphire substrates, forming joint of columnar structure. The non-doped α-(GaFe)2O3 thin films showed ferromagnetic properties at 300 K, though the origin of ferromagnetism still remained unresolved. In order to enhance the spin-carrier interaction, Sn doped α-(GaFe)2O3 alloy thin films were fabricated on c-plane sapphire substrates. X-ray diffraction 2θ/θ and ω scanning measurement results indicated that the highly-crystalline films were epitaxially grown on substrates in spite of the Sn-doping.

The crystal-chemistry of Vietnamese talcs from the Thanh Son district (Phu Tho province, Vietnam)

Clay Minerals ◽  
2015 ◽  
Vol 50 (5) ◽  
pp. 607-617 ◽  
Author(s):  
Angela Dumas ◽  
François Martin ◽  
The Ngo Ke ◽  
Hanh Nguyen Van ◽  
Dung Nguyen Viet ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Nuclear Magnetic Resonance ◽  
Crystal Chemistry ◽  
Industrial Applications ◽  
Crystal Chemical ◽  
Chemical Analyses ◽  
X Ray Diffraction ◽  
Ore Deposit ◽  
X Ray ◽  
Wide Range

AbstractThe mineralogy and crystal chemistry of a new talc ore deposit situated at Thu Ngac commune, Thanh Son district, Phu Tho province, Vietnam, was investigated using X-ray fluorescence, electron microprobe, X-ray diffraction, Fourier transform infrared spectroscopy, solid-state nuclear magnetic resonance (29Si and1H) and colorimetry.Both chemical and crystal-chemical analyses showed that the talcs from the Phu Tho province are very pure because they contain few accessory minerals (chlorite, amphibole and goethite) and few substitutions of Si by Fe and Al in their crystal structure. The talc ore may well meet the standards required for a wide range of industrial applications.

scholarly journals A Standard Reference Material Containing Nominally Four Percent Austenite

1970 ◽  
Vol 14 ◽  
pp. 78-91
Author(s):  
G.E. Hicho ◽  
H. Yakowitz ◽  
S.D. Rasberry ◽  
R.E. Michaelis
Keyword(s):  
Stainless Steel ◽  
Nickel Content ◽  
Fluorescence Analysis ◽  
Steel Powder ◽  
Stainless Steel Powder ◽  
X Ray Diffraction ◽  
Quantitative Microscopy ◽  
X Ray ◽  
Austenite Content ◽  
Special Cases

AbstractThis standard was produced by powder metallurgical techniques using known amounts of austenite. Using these techniques, 134 specimens were prepared. Because these standards are expected to be used primarily for the calibration of X-ray diffraction equipment, only one surface of each standard is certified, and these surfaces range from 3.1 percent to 5.2 percent in austenite content. To make the specimens, 310 stainless steel powder (austenitid) was blended with 430 stainless steel powder (ferritic) to make a mixture of 5 percent austenite in ferrite. The material was compacted, sintered, polished and etched so the austenite appears white and the ferrite, a deep brown. Then quantitative microscopy methods were used to determine the percentage of austenite near the surface. Furthers more, the 310 powder contains 20 percent of nickel while the 430 powder contains virtually no nickel. Therefore, after establishing a meaningful calibration curve, X-ray fluorescence analysis for the nickel content was also used as a direct measurement of the amount of retained austenite on the surface of the compact. Both procedures were carried out on fifteen specimens statistically selected from the total number of compacts produced. Agreement, within experimental error limits, was obtained between the X-ray fluorescence results and quantitative microscopy results. The X-ray fluorescence method was used to characterize all additional compacts. X-ray diffraction determinations of austenite content are in good agreement with the X-ray fluorescence and quantitative microscopy results. The compacts may be used as X-ray diffraction standards for austenite or in special cases as X-ray fluorescence standards for nickel content.

A New Polyethylene Corrosion Protecting Coating with Ion Selectivity

2011 ◽  
Vol 314-316 ◽  
pp. 273-278
Author(s):  
Yu Hua Dong ◽  
Ke Ren ◽  
Qiong Zhou
Keyword(s):  
Ion Selectivity ◽  
Nano Particles ◽  
Ammonium Bromide ◽  
Linear Low Density Polyethylene ◽  
X Ray Diffraction ◽  
Sulfosalicylic Acid ◽  
X Ray ◽  
Chemically Modified ◽  
Before And After ◽  
Industrial Standards

Linear low density polyethylene (LLDPE) was chemically modified with grafting maleic anhydride (MAH) monomer on its backbone by melting blending. Nano-particles SiO2 was modified by cationic surfactant hexadecyl trimethyl ammonium bromide (CTAB) and anionic surfactant sulfosalicylic acid (SSA) and added to PE coating respectively. Measurement of membrane potential showed that the coating containing modified SiO2 nano-particles had characteristic of ion selectivity. The properties of the different coatings were investigated according to relative industrial standards. Experimental results indicated that PE coating with ion selectivity had better performances, such as adhesion strength, cathodic disbonding and anti-corrosion, than those of coating without ion selectivity. Crystal structure of the coatings before and after alkali corrosion was characterized by Fourier transform infrared spectra (FTIR) and X-ray diffraction (XRD). Structure of the coating without ion selectivity was damaged by NaOH alkali solution, causing mechanical properties being decreased. And the structure of the ion selective coatings was not affected.

scholarly journals Statistical analysis of the reproducibility of residual stress measurements in cold extruded parts

2021 ◽  
Author(s):  
Fabian Jaeger ◽  
Alessandro Franceschi ◽  
Holger Hoche ◽  
Peter Groche ◽  
Matthias Oechsner
Keyword(s):  
Residual Stress ◽  
Statistical Analysis ◽  
Stress Measurement ◽  
Industrial Applications ◽  
Cold Extrusion ◽  
X Ray Diffraction ◽  
Forming Process ◽  
X Ray ◽  
Stress States ◽  
Key Aspects

AbstractCold extruded components are characterized by residual stresses, which originate from the experienced manufacturing process. For industrial applications, reproducibility and homogeneity of the final components are key aspects for an optimized quality control. Although striving to obtain identical deformation and surface conditions, fluctuation in the manufacturing parameters and contact shear conditions during the forming process may lead to variations of the spatial residual stress distribution in the final product. This could lead to a dependency of the residual stress measurement results on the relative axial and circumferential position on the sample. An attempt to examine this problem is made by the employment of design of experiments (DoE) methods. A statistical analysis of the residual stress results generated through X-Ray diffraction is performed. Additionally, the ability of cold extrusion processes to generate uniform stress states is analyzed on specimens of austenitic stainless steel 1.4404 and possible correlations with the pre-deformed condition are statistically examined. Moreover, the influence of the coating, consisting of oxalate and a MoS2 based lubricant, on the X-Ray diffraction measurements of the surface is investigated.

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