Component of Cu/n-SiO2 Composite Particles by Mechanical Milling

Mechanical Milling ◽

Milling Time ◽

Composite Particles ◽

Composite Powders ◽

X Ray ◽

Copper based composite powders with nano-SiO2 were prepared by mechanical milling technology. The effects of milling time on morphology and component of the composite particles were characterized by scanning electron microscopy (SEM) and energy disperse X-ray spectroscopy (EDS), respectively. Results showed that dendrite composite particles change to the flaky, and then to spherical ones with the milling time increasing. The n-SiO2 particles disperse more homogeneously in the composite particles with the milling time increasing.

The Synthesis of Cu0.81Ni0.19 Intermetallics by Mechanical Alloying

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.496.379 ◽

2012 ◽

Vol 496 ◽

pp. 379-382

Author(s):

Rui Song Yang ◽

Ming Tian Li ◽

Chun Hai Liu ◽

Xue Jun Cui ◽

Yong Zhong Jin

Keyword(s):

Electron Microscopy ◽

Grain Size ◽

Mechanical Alloying ◽

Milling Time ◽

Elemental Powder ◽

X Ray Diffraction ◽

X Ray ◽

Scherrer Equation ◽

The Cu0.81Ni0.19 has been synthesized directly from elemental powder of nickel and copper by mechanical alloying. The alloyed Cu0.81Ni0.19 alloy powders are prepared by milling of 8h. The grain size calculated by Scherrer equation of the NiCu alloy decreased with the increasing of milling time. The end-product was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM)

Preparation of Zirconium Carbide-Zirconium Silicide Composite Powders by Solid Reaction of Zr and SiC Powders

Materials Science ◽

10.5755/j01.ms.26.3.21733 ◽

2020 ◽

Vol 26 (3) ◽

pp. 348-351

Author(s):

Yingxin CHEN ◽

Shoujun WU ◽

Shaojun MA ◽

Xiao ZHAO ◽

Baowei CAO

Keyword(s):

Electron Microscopy ◽

Diffusion Layer ◽

Zirconium Carbide ◽

X Ray Diffraction ◽

Solid Reaction ◽

Composite Powders ◽

X Ray ◽

Zirconium Silicide ◽

In the present work, zirconium carbide-zirconium silicide composite powders were prepared by solid reaction using Zr and SiC powders as reactants. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) results showed that, after treatment at 800 ºC, the produced zirconium carbide-zirconium silicide diffusion layer was very thin and mainly consisted of ZrC and ZrSi2. After treatment above 900 ºC, the produced phases were mainly consisted of ZrC and ZrSi2, plus less ZrSi.

Effects of Milling Time and Annealing Schedule on Mechanical Activation Synthesis of Brownmillerite Structural Ca2Fe2O5

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.295-297.1099 ◽

2011 ◽

Vol 295-297 ◽

pp. 1099-1102

Author(s):

Fen Wang ◽

Chun Zhao ◽

Jian Feng Zhu

Keyword(s):

Electron Microscopy ◽

Powder Diffraction ◽

Milling Time ◽

High Energy ◽

Sem Analysis ◽

Annealing Schedule ◽

X Ray ◽

Lower Temperature ◽

The brownmillerite structural Ca2Fe2O5is successfully prepared by high energy milling starting from CaCO3and Fe2O3. The composition and transformation of phase and structure with different milling time and annealed at 800 °C for 24 h were characterized by the X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) analysis. The results indicate that the high pure brownmillerite structural Ca2Fe2O5could be efficiently synthesized at lower temperature by the mechanically activated mixtures.

Structural Evolution of the Cu-Ni Solid Solution Formed by Ball Mechanical Alloying Treatment (BMAT)

Materials Science Forum ◽

10.4028/www.scientific.net/msf.673.279 ◽

2011 ◽

Vol 673 ◽

pp. 279-284 ◽

Cited By ~ 1

Author(s):

Iman Farahbakhsh ◽

Alireza Zakeri ◽

Palavesamuthu Manikandan ◽

Kazuyuki Hokamoto

Keyword(s):

Electron Microscopy ◽

Mechanical Alloying ◽

Milling Time ◽

Structural Evolution ◽

Mutual Diffusion ◽

X Ray Diffraction ◽

X Ray ◽

Ma Process ◽

A nanostructured powder with uniform distribution of Ni and Cu powders was produced by means of the Ball Mechanical Alloying Treatment (BMAT). Mutual diffusion of Ni and Cu in the nanostructured layer and the microstructure of the cross section of the remaining powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Electron Probe Microanalyzer (EPMA). X-ray diffraction patterns revealed that increasing the milling time gives rise to decreasing crystallite size and lattice parameter during the MA process. Furthermore, scanning electron microscopy (SEM) was utilized not only for evaluating the morphology and microstructure of the remaining powder particles but also for proving this claim that during MA process, the mutual diffusion of Ni and Cu has occurred. Elemental mappings also show that the alloying process occurred in samples but obtaining the uniform shape, size and microstructure of the powder requires increase in the milling time.

Effect of Mechanical Milling on the Microstructure and Hydrogen Interaction of Both Mm-Ni and MmNi5-Ni Mixtures

Materials Science Forum ◽

10.4028/www.scientific.net/msf.570.72 ◽

2008 ◽

Vol 570 ◽

pp. 72-77

Author(s):

Marcelo R. Esquivel ◽

Gabriel Meyer

Keyword(s):

Electron Microscopy ◽

Mechanical Milling ◽

Milling Time ◽

X Ray Diffraction ◽

X Ray ◽

Hydrogen Interaction ◽

Size And Morphology ◽

Temperature Heating ◽

Evolution With Time ◽

Mechanical milling (MM) and a combination of MM and temperature heating were used to synthesize the intermetallic MmNi5 and a MmNi5-Ni mixture, respectively. The process evolution with time was analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). SEM was used to characterize size and morphology of particles in order to reveal the governing mechanisms during the milling of each system. X-ray diffraction (XRD) was utilized to determine strain and crystallite size changes introduced by milling. The effects of integrated milling time on the sorption properties of the MmNi5-Ni mixture were analyzed. Results were correlated to defects introduced into microstructure. A comparison of the final characteristics of alloys obtained in each case is also shown.

Dissolution of Al 6%wt c Mixture Using Mechanical Alloying

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.391.82 ◽

2019 ◽

Vol 391 ◽

pp. 82-87

Author(s):

R. Dabouz ◽

Meriem Bendoumia ◽

Lounes Belaid ◽

Mohamed Azzaz

Keyword(s):

Electron Microscopy ◽

Mechanical Alloying ◽

Solid Solubility ◽

Milling Time ◽

X Ray Diffraction ◽

Processing Methods ◽

X Ray ◽

In the equilibrium processing methods the system Al-C does not show any solid solubility which means that carbon is not soluble in aluminum. In this work an investigation of mechanical alloying on system Al-C was presented to force the dissolution. Using different techniques such as the X-ray diffraction and scanning electron microscopy (SEM), it was proved the force of dissolution by studying the specters for different milling time and by flowing the evolution during annealing into a DSC. Furthermore, morphology of phases has been studied.

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100111550 ◽

1984 ◽

Vol 42 ◽

pp. 288-289

Author(s):

Vicki L. Baliga ◽

Mary Ellen Counts

Keyword(s):

Electron Microscopy ◽

Calcium Oxalate ◽

Growth And Development ◽

Polarized Light ◽

Calcium Oxalate Crystals ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.

Scanning Electron Microscopy and X-Ray Analyses of Dental Tissues from a Hibernator

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100090877 ◽

1976 ◽

Vol 34 ◽

pp. 178-179

Author(s):

M. L. Zimny ◽

A. C. Haller

Keyword(s):

Electron Microscopy ◽

Body Temperature ◽

Ground Squirrel ◽

Alveolar Bone ◽

X Ray ◽

Dental Tissues ◽

Bone Minerals ◽

Apical Tooth ◽

During hibernation the ground squirrel is immobile, body temperature reduced and metabolism depressed. Hibernation has been shown to affect dental tissues varying degrees, although not much work has been done in this area. In limited studies, it has been shown that hibernation results in (1) mobilization of bone minerals; (2) deficient dentinogenesis and degeneration of alveolar bone; (3) presence of calculus and tears in the cementum; and (4) aggrevation of caries and pulpal and apical tooth abscesses. The purpose of this investigation was to study the effects of hibernation on dental tissues employing scanning electron microscopy (SEM) and related x-ray analyses.

Scanning Electron Microscopy and x-ray analysis of microparticles and early hydration effects

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100139834 ◽

1995 ◽

Vol 53 ◽

pp. 692-693

Author(s):

Yun Lu ◽

David C. Joy

Keyword(s):

Electron Microscopy ◽

High Resolution ◽

Morphological Development ◽

Early Hydration ◽

X Ray ◽

Blended Cements ◽

Powder Particles ◽

Chemical Wastes ◽

High resolution scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDXA) were performed to investigate microparticles in blended cements and their hydration products containing sodium-rich chemical wastes. The physical appearance of powder particles and the morphological development at different hydration stages were characterized by using high resolution SEM Hitachi S-900 and by SEM S-800 with a EDX spectrometer. Microparticles were dispersed on the sample holder and glued by 1% palomino solution. Hydrated bulk samples were dehydrated by acetone and mounted on the holder by silver paste. Both fracture surfaces and flat cutting sections of hydrating samples were prepared and examined. Some specimens were coated with an 3 nm thick Au-Pd or Cr layer to provide good conducting surfaces. For high resolution SEM S-900 observations the accelerating voltage of electrons was 1-2 KeV to protect the electron charging. Microchemical analyses were carried out by S800/EDS equipped with a LINK detector of take-off angle =40°.

Defects of Platelet Function Recognized by X-Ray Imaging and Scanning Electron Microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100119806 ◽

1985 ◽

Vol 43 ◽

pp. 610-613

Author(s):

M.G. Baldini ◽

S. Morinaga ◽

D. Minasian ◽

R. Feder ◽

D. Sayre ◽

...

Keyword(s):

Electron Microscopy ◽

Cell Biology ◽

Imaging Technique ◽

Human Platelets ◽

X Rays ◽

X Ray ◽

X Ray Imaging ◽

Complex Phenomena ◽

Contact X-ray imaging is presently developing as an important imaging technique in cell biology. Our recent studies on human platelets have demonstrated that the cytoskeleton of these cells contains photondense structures which can preferentially be imaged by soft X-ray imaging. Our present research has dealt with platelet activation, i.e., the complex phenomena which precede platelet appregation and are associated with profound changes in platelet cytoskeleton. Human platelets suspended in plasma were used. Whole cell mounts were fixed and dehydrated, then exposed to a stationary source of soft X-rays as previously described. Developed replicas and respective grids were studied by scanning electron microscopy (SEM).