Plasma Nitriding of Surface Mo-Enriched Sintered Iron

ISRN Materials Science ◽

10.5402/2011/121464 ◽

2011 ◽

Vol 2011 ◽

pp. 1-8 ◽

Cited By ~ 7

Author(s):

T. Bendo ◽

H. C. Pavanati ◽

A. N. Klein ◽

A. E. Martinelli ◽

A. M. Maliska

Keyword(s):

Plasma Nitriding ◽

Plasma Reactor ◽

Microstructural Characterization ◽

Line Profiles ◽

Surface Alloying ◽

X Ray Diffraction ◽

Alloying Element ◽

Sintered Iron ◽

X Ray

Plain iron samples produced by powder metallurgy were submitted to a single thermal cycle involving plasma-assisted sintering and simultaneous surface alloying with Mo followed by nitriding using a plasma reactor. The microstructural characterization of the samples was carried out by optical and scanning electron microscopy in addition to X-ray diffraction. Microhardness tests were also performed. EDX line profiles of the concentration of Mo from the surface to the bulk of the sintered samples showed that the alloying element diffused down to depths of about 25 μm under the sintering conditions applied. A significant increase in microhardness was observed for samples enriched with Mo and subsequently nitrided. This behavior was attributed to the precipitation of nitrides and the presence of Mo in solid solution.

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The Influence of the Third Element on Nano-Mechanical Properties of Iron Borides FeB and Fe2B Formed in Fe-B-X (X = C, Cr, Mn, V, W, Mn + V) Alloys

Materials ◽

10.3390/ma13184155 ◽

2020 ◽

Vol 13 (18) ◽

pp. 4155

Author(s):

Ivana Kirkovska ◽

Viera Homolová ◽

Ivan Petryshynets ◽

Tamás Csanádi

Keyword(s):

Mechanical Properties ◽

Indentation Size Effect ◽

Microstructural Characterization ◽

Indentation Hardness ◽

Indentation Modulus ◽

Instrumented Indentation ◽

X Ray Diffraction ◽

Alloying Element ◽

X Ray

In this study, the influence of alloying elements on the mechanical properties of iron borides FeB and Fe2B formed in Fe-B-X (X = C, Cr, Mn, V, W, Mn + V) alloys were evaluated using instrumented indentation measurement. The microstructural characterization of the alloys was performed by means of X-ray diffraction and scanning electron microscope equipped with an energy dispersive X-ray analyzer. The fraction of the phases present in the alloys was determined either by the lever rule or by image analysis. The hardest and stiffest FeB formed in Fe-B-X (X = C, Cr, Mn) alloys was observed in the Fe-B-Cr alloys, where indentation hardness of HIT = 26.9 ± 1.4 GPa and indentation modulus of EIT = 486 ± 22 GPa were determined. The highest hardness of Fe2B was determined in the presence of tungsten as an alloying element, HIT = 20.8 ± 0.9 GPa. The lowest indentation hardness is measured in manganese alloyed FeB and Fe2B. In both FeB and Fe2B, an indentation size effect was observed, showing a decrease of hardness with increasing indentation depth.

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Influence of the Residue of Casting by Lost Wax in the Modulus of Elasticity and Porosity of Concretes

Materials Science Forum ◽

10.4028/www.scientific.net/msf.805.343 ◽

2014 ◽

Vol 805 ◽

pp. 343-349

Author(s):

Carine F. Machado ◽

Weber G. Moravia

Keyword(s):

Construction Industry ◽

Modulus Of Elasticity ◽

Chemical Characterization ◽

Microstructural Characterization ◽

Cement Matrix ◽

X Ray Diffraction ◽

X Ray ◽

Hardened State ◽

Material Powder

This work evaluated the influence of additions of the ceramic shell residue (CSR), from the industries of Lost Wax Casting, in the modulus of elasticity and porosity of concrete. The CSR was ground and underwent a physical, chemical, and microstructural characterization. It was also analyzed, the environmental risk of the residue. In the physical characterization of the residue were analyzed, the surface area, and particle size distribution. In chemical characterization, the material powder was subjected to testing of X-ray fluorescence (XRF). Microstructural characterization was performed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The residue was utilized like addition by substitution of cement in concrete in the percentages of 10% and 15% by weight of Portland cement. It was evaluated properties of concrete in the fresh and hardened state, such as compressive strength, modulus of elasticity, absorption of water by total immersion and by capillarity. The results showed that the residue can be used in cement matrix and improve some properties of concrete. Thus, the CSR may contribute to improved sustainability and benefit the construction industry.

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Microstructural Characterization of Thin Polycrystalline Films by X-ray Diffraction

Advances in X-Ray Analysis ◽

10.1007/978-1-4613-1035-8_14 ◽

1988 ◽

pp. 129-142 ◽

Cited By ~ 2

Author(s):

C. N. J. Wagner ◽

M. S. Boldrick ◽

L. Keller

Keyword(s):

Microstructural Characterization ◽

Polycrystalline Films ◽

X Ray Diffraction ◽

X Ray ◽

Thin Polycrystalline

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Molecular and microstructural characterization of lecithin-based oleogels made with vegetable oil

RSC Advances ◽

10.1039/c6ra04324k ◽

2016 ◽

Vol 6 (53) ◽

pp. 47373-47381 ◽

Cited By ~ 19

Author(s):

Maxime Bodennec ◽

Qing Guo ◽

Dérick Rousseau

Keyword(s):

Vegetable Oil ◽

Small Angle ◽

Microstructural Characterization ◽

X Ray Diffraction ◽

X Ray ◽

3D Network

Lecithin-based oleogels consist of a worm-like entangled fibrous 3D network. Small angle X-ray diffraction suggests that these microfibres are formed by the packing of reverse hexagonal (HII) tubules parallel to the axis of fibres.

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Microstructural Characterization of Glass-to-Metal Brazed Joint

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.616-618.1732 ◽

2012 ◽

Vol 616-618 ◽

pp. 1732-1735 ◽

Cited By ~ 1

Author(s):

Xi Hai Shen ◽

Yu Gang Zheng ◽

Liang Chang ◽

Jin Jia Guo ◽

Song Bin Ye ◽

...

Keyword(s):

Thermal Power ◽

Microstructural Characterization ◽

Xrd Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Solar Thermal Power ◽

Brazed Joints ◽

Brazed Joint ◽

Scanning Electron

Aiming at the glass-to-metal seals serving in the Solar Thermal Power (STP), glass-to-metal vacuum brazed joints were studied. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis were performed to examine the microstructure and element contents of interface seam on the glass-to-metal vacuum brazed joints. Also, the compositional concentration of the interface seam was measured by using energy dispersive spectroscopy (EDS).

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Microstructural Characterization of Ornamental Rock Samples: Cariri Rocks

Materials Science Forum ◽

10.4028/www.scientific.net/msf.869.159 ◽

2016 ◽

Vol 869 ◽

pp. 159-163

Author(s):

Danúbia Lisbôa da Costa ◽

Ingrid Mayara Medeiros Fernandes ◽

Aluska Nascimento Simões Braga ◽

Rosiane Maria da Costa Farias ◽

Romualdo Rodrigues Menezes ◽

...

Keyword(s):

Chemical Analysis ◽

Microstructural Characterization ◽

Magnesium Carbonate ◽

X Ray Diffraction ◽

X Ray ◽

Mineral Sector ◽

Microstructural Heterogeneity ◽

Calcium And Magnesium ◽

Application Fields

Ornamental rocks are among the most promising business areas of the mineral sector, raising the necessity for, besides beauty, investments in quality, safety and characterization in the various application fields of these rocks. So, this work aims at the microstructural characterization of the class of these rocks: the Cariri Rocks, also known the limestone, which are calcareous rocks mainly formed by calcium and magnesium carbonate, possibly presenting variations due to their origins. For characterization, we studied four samples, being two from Chapada do Apodi and two from Chapada do Araripe, characterized physically and micro-structurally through chemical analysis, X-ray diffraction, optical micrography and porosimetry tests. The results prove that the limestones are calcitic and dolomitic, and present porosity varying from 5 to 15%, with pores concentration between 100nm and 10μm, besides the high microstructural heterogeneity.

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Microstructure and Properties of Nanosemicrystalline Si3N4 Ceramics with Doped Sintering Additives: Part I. Microstructural Characterization of Nanosemicrystalline Si3N4 Powders

Journal of Materials Research ◽

10.1557/jmr.1998.0360 ◽

1998 ◽

Vol 13 (9) ◽

pp. 2580-2587 ◽

Cited By ~ 4

Author(s):

K. H. Ryu ◽

J-M. Yang

Keyword(s):

Microstructural Characterization ◽

Degree Of Crystallinity ◽

Chemical Compositions ◽

X Ray Diffraction ◽

X Ray ◽

Sintering Additives ◽

Transmission Electron ◽

Wet Chemical ◽

Si3n4 Ceramics

The characteristics of nanosized silicon nitride powders with doped Y2O3 and Al2O3 fabricated by a plasma-reacted chemical process were investigated. The chemical compositions of the powders were analyzed by wet chemical analysis. The morphology and the size distribution were determined by transmission electron microscopy (TEM). TEM with energy dispersive spectroscopy (EDS) was used to verify the existence of sintering additives in each individual particle. The crystal structure of the powders was identified by the selected area diffraction pattern (SADP). X-ray diffraction (XRD) technique was used for phase analysis and the measurement of degree of crystallinity. The characteristics of chemical bonding was analyzed by using Fourier transform infrared spectroscopy (FTIR).

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X-ray diffraction studies of the decomposition and microstructural characterization of cold-worked powders of Cu–15Ni–Sn alloys by Rietveld analysis

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2003.10.019 ◽

2004 ◽

Vol 377 (1-2) ◽

pp. 103-116 ◽

Cited By ~ 33

Author(s):

P. Sahu ◽

S.K. Pradhan ◽

M. De

Keyword(s):

Microstructural Characterization ◽

Rietveld Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Cold Worked

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Microstructural Characterization of Ba2YCu3O7 Films Produced by Co-Evaporation

MRS Proceedings ◽

10.1557/proc-99-703 ◽

1987 ◽

Vol 99 ◽

Cited By ~ 2

Author(s):

G. J. Fisanick ◽

P. Mankeewicht ◽

W. Skocpolt ◽

R. E. Howardt ◽

A. Dayem ◽

...

Keyword(s):

Plane Surface ◽

Depth Profiling ◽

Microstructural Characterization ◽

Areal Density ◽

Oxygen Stoichiometry ◽

X Ray Diffraction ◽

X Ray ◽

Annealing Conditions ◽

Auger Microscopy

ABSTRACTBa2YCu3O7 films produced by co-evaporation of BaF2, Cu and Y onto <100> S1TiO3 substrates in an O2 ambient followed by post-annealing were analyzed using RBS, X-ray diffraction and Auger microscopy. These films exhibit Tc's (R=0) of =90K and a best Jc of > 1.0×106 A/cm2 at 81K for a =2500A thick film. RBS and Auger depth profiling limit the level of F present in the post-annealed films to <5 at. %, although F is evident in the as-deposited material. RBS channeling experiments yield a Xmin=31%, demonstrating the epitaxial quality of the films. X-ray diffraction shows that the films are predominantly oriented with c-axis perpendicular to the substrate, with narrow mosaic spread in-plane. A small portion of the film is in the form of needles oriented with a-axis perpendicular to the substrate, whose areal density is dependent on annealing conditions and local film stoichiometry. Scanning Auger microscopy confirms that the needles and c-axis plateaus have the same metal and oxygen stoichiometry. Also present in the film are insulating balls which appear to nucleate terraces in the c-axis perpendicular structure. Scanning Auger shows that these features are also close to the metals stoichiometry, but are C rich compared to the needles. The plateaus are covered with =11 times more C than the needles, indicating that the basal plane surface is highly reactive. Auger depth profiling and RBS show little evidence for interdiffusion.

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