Morphology and Chemical Composition of Silicon Carbide Surfaces Interacting with Iron, Cobalt, and Nickel in Microscratching

2018 ◽  
Vol 284 ◽  
pp. 363-368 ◽  
Author(s):  
V.A. Nosenko ◽  
A.V. Fetisov ◽  
V.Ye. Puzyrkova
Keyword(s):  
Silicon Carbide ◽  
Electron Microscope ◽  
Chemical Composition ◽  
Iron Cobalt ◽  
Beam Electron ◽  
X Ray ◽  
Metal Atoms ◽  
Dual Beam ◽  
Structure Of Metal ◽  
Cobalt And Nickel

The paper dwells upon the specifics of worn spots being formed on a silicon-carbide crystal in microscratching of iron, cobalt, and nickel. Analysis was done using a Versa 3D dual-beam electron microscope. The chemical composition of worn spots was studied by local X-ray microanalysis. It was found out that the amount of metal transferred to the silicon-carbide worn spot was associated with the electron structure of metal atoms.

Impregnation of the surface of niobium alloy when grinding with corundum and silicon carbide wheels

2021 ◽  
pp. 83-88
Author(s):  
Keyword(s):  
Silicon Carbide ◽  
Electron Microscope ◽  
Niobium Alloy ◽  
Material Transfer ◽  
Beam Electron ◽  
X Ray ◽  
Ceramic Bond ◽  
Abrasive Tools

The features of the formation of a relief after grinding a niobium alloy with abrasive tools made of corundum and silicon carbide on a ceramic bond are considered. The treated surface is studied with a scanning two-beam electron microscope. Keywords: niobium, grinding, corundum, silicon carbide, material transfer, impregnation, micro-X-ray pattern. [email protected]

scholarly journals Theoretical and Experimental Evaluation of Particle size Effect of Iron , Cobalt ,and Nickel Powders Suspended in Al Dura oil on XRF Intensities

2007 ◽  
Vol 4 (3) ◽  
pp. 475-481
Author(s):  
Baghdad Science Journal
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Laser System ◽  
Particle Size Effect ◽  
Particle Sizes ◽  
Iron Cobalt ◽  
X Ray ◽  
Nickel Powders ◽  
Good Agreement ◽  
Cobalt And Nickel

Iron , Cobalt , and Nickel powders with different particle sizes were subjected to sieving and He-Ne laser system to determine the particle size . 1wt% from each powders was blended carefully with 99wt% from Iraqi oil . Microscopic examination were carried for all samples to reveal the particle size distribution . A Siemens type SRS sequential wavelength dispersive(WDS) X-ray spectrometer was used to analyze all samples , and the XRF intensity were determined experimentally and theoretically for all suspended samples , Good agreement between theoretical and experimental results were found .

X-ray topographic dislocation contrast visible in reflections orthogonal to the Burgers vectors of axial screw dislocations in hexagonal silicon carbide

2001 ◽  
Vol 34 (1) ◽  
pp. 20-26 ◽  
Author(s):  
W. M. Vetter ◽  
M. Dudley
Keyword(s):  
Silicon Carbide ◽  
Electron Microscope ◽  
Basal Plane ◽  
High Density ◽  
Screw Dislocations ◽  
X Ray ◽  
Apparent Violation ◽  
Light Contrast

Contrast is associated with micropipes in X-ray topographs of SiC crystals obtained with prismatic reflections, representing an apparent violation of theg·b= 0 invisibility criterion. This is explained as a population of basal-plane dislocations with Burgers vectors of the setb= {\textstyle{1 \over 3}}〈11{\bar{2}}0〉 that occur in a high density within a few micrometers of the micropipes, below the resolution of X-ray topography. These basal-plane dislocations could be observed under an electron microscope. The presence of the surfaces of the micropipes influences the dislocation images in the topographs taken with prismatic reflections, often resulting in a band of light contrast along the axes of the micropipes.

scholarly journals Effect of Liquid Ga on Metal Surfaces: Characterization of Morphology and Chemical Composition of Metals Heated in Liquid Ga

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Eun Je Lee ◽  
Min Goo Hur ◽  
Jeong Mun Son ◽  
Jeong Hoon Park ◽  
Seung Dae Yang
Keyword(s):  
Electron Microscope ◽  
Chemical Composition ◽  
Chemical Resistance ◽  
Maximum Amount ◽  
Liquid Gallium ◽  
Heating Process ◽  
X Ray ◽  
Metal Foils ◽  
Scanning Electron

This study investigates the effect of liquid gallium (Ga) on metal foils made of titanium (Ti), niobium (Nb), and molybdenum (Mo). The Ti, Nb, and Mo foils were heated in liquid Ga at 120°C for a maximum of two weeks. After heating, the changes in the morphology and the chemical composition of the metal foils were analyzed by using a field emission scanning electron microscope, energy-dispersive X-ray spectrometer, X-ray diffractometer, and X-ray photoelectron spectrometer. The results of the analysis indicated that the Nb foil showed the minimum adhesion of liquid Ga to the surface while the maximum amount of liquid Ga was observed to adhere to the Ti foil. In addition, the Nb foil was oxidized and the Mo foil was reduced during the heating process. Considering these effects, we conclude that Mo may be used as an alternative encapsulation material for Ga in addition to Nb, which is used as the conventional encapsulation material, due to its chemical resistance against oxidation in hot liquid Ga.

Preparation of Silicon Carbide Nanowires and Nanochains Using Chemical Vapor Deposition Method

2016 ◽  
Vol 697 ◽  
pp. 841-845 ◽  
Author(s):  
Jia Xing Chang ◽  
Rong Zheng Liu ◽  
Ma Lin Liu ◽  
You Lin Shao ◽  
Bing Liu
Keyword(s):  
Silicon Carbide ◽  
Chemical Vapor Deposition ◽  
Electron Microscope ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Raw Material ◽  
Chemical Vapor Deposition Method ◽  
Deposition Method ◽  
X Ray ◽  
Wide Range

Silicon carbide nanowires have been extensively studied because of their unique physical and chemical properties. They can be applied in high temperature, high frequency, high power, and corrosive environments, and have a wide range of applications in electronics, chemical industry, energy and other fields. In this paper, SiC nanowires with high output were synthesized by chemical vapor deposition method using methyltrichlorosilane as raw material. The influences of the catalyst and temperature were studied. SiC nanochains were also obtained by adding Al2O3 powder under appropriate temperature controlled strategy. These two kinds of one-dimensional SiC nanomaterials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS) and transmission electron microscope (TEM) methods.

Dislocations in YBa2Cu3O7−δ (δ = 0.77)

1990 ◽  
Vol 48 (4) ◽  
pp. 72-73
Author(s):  
Yimei Zhu ◽  
Hong Zhang ◽  
A.R. Moodenbaugh ◽  
M. Suenaga
Keyword(s):  
Electron Microscope ◽  
Electron Diffraction ◽  
Displacement Vector ◽  
Stacking Faults ◽  
Spot Size ◽  
Convergent Beam Electron Diffraction ◽  
Burgers Vector ◽  
Beam Electron ◽  
X Ray ◽  
Convergent Beam

Abundant dislocations and dislocations associated with stacking faults were observed and characterized in YBa2Cu3O7−δ (δ= 0.77). The crystallographic orientation of the dislocation and the fault were analyzed using Kikuchi patterns matched with computer generated Kikuchi maps. The Burgers vector of the dislocation and the displacement vector of the fault were determined by using the g·b = 0 and g · R=0 criteria.Bulk samples of YBa2Cu3O7 were produced by standard pressing and sintering up to 970 °C. Samples were heated in air, then quenched into liquid nitrogen to reduce oxygen content. Subsequent anneal at 200 ° C took place with samples sealed in silica with 1/2 atm. of argon. TEM specimens were thinned by ion mill and examined in a JEOL 2000FX electron microscope operating at 200kv.X-ray powder diffraction and convergent beam electron diffraction with 200 Å spot size show that YBa2Cu3O6.23 has a tetragonal structure.

scholarly journals Crystal structure of the Al20Mn5.37Ni1.31 phase in the Al–Mn–Ni system

IUCrData ◽  
2021 ◽  
Vol 6 (9) ◽  
Author(s):  
Qifa Hu ◽  
Bin Wen ◽  
Changzeng Fan
Keyword(s):  
Chemical Composition ◽  
Transition Metal ◽  
Intermetallic Phase ◽  
Structure Type ◽  
Complementary Energy ◽  
X Ray ◽  
Group Type ◽  
Metal Atoms ◽  
Transition Metal Atoms ◽  
Initial Chemical Composition

The intermetallic phase with composition Al20Mn5.37Ni1.31 (icosaaluminium pentamanganese nickel) was synthesized by high-temperature sintering of a mixture with initial chemical composition Al60Mn7Ni3. Al20Mn5.37Ni1.31 adopts the Co2Al5 structure type in space-group type P63/mmc, replacing the Co atoms with the transition-metal atoms Mn and Ni. Structure analysis revealed that one of the two transition-metal sites is partially occupied by Ni [refined occupancy 0.342 (2)] and the other is co-occupied by Mn and Ni with a ratio of 0.895 (14):0.105 (14). The present refined chemical composition is supported by complementary energy-dispersive X-ray fluorescence (EDX) analysis and is in agreement with the previously determined Al–Mn–Ni phase diagram [Balanetskyy et al. (2011). J. Alloys Compd, 509, 3795–3805].

Comparison of Performance of an Analytical Electron Microscope at 300 and 100 kV

1984 ◽  
Vol 41 ◽  
Author(s):  
J. Bentley ◽  
E. A. Kenik ◽  
P. Angelini ◽  
A. T. Fisher ◽  
P. S. Sklad ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Materials Science ◽  
Convergent Beam Electron Diffraction ◽  
Beam Electron ◽  
X Ray ◽  
Transmission Electron ◽  
Analytical Electron ◽  
Analytical Electron Microscope ◽  
Convergent Beam ◽  
Electron Energy Loss

AbstractPreliminary results on the performance of an analytical electron microscope (AEM) operating at 300 kV have been obtained and compared with the performance at 100 kV. Some features of the anticipated improvements for transmission electron microscopy (TEM) imaging, convergent beam electron diffraction (CBED), energy dispersive X-ray spectroscopy (EDS), and electron energy loss spectroscopy (EELS) have been studied from the aspect of materials science applications. The electron microscope used was a Philips EM430T operated with a LaB6 cathode and equipped with EDAX 9100/70 EDS and Gatan 607 EELS systems.

Sign in / Sign up

Export Citation Format

Share Document