Preparation of Electroless Ni-Mo Coated TiC Powder

2010 ◽  
Vol 434-435 ◽  
pp. 522-525
Author(s):  
Wu Peng ◽  
Yong Zheng ◽  
Quan Yuan ◽  
Hai Zhou Yu ◽  
Shao Gang Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thin Layers ◽  
Surface Microstructure ◽  
X Ray ◽  
Unknown Phase ◽  
Supersaturated State ◽  
Diffraction Peaks ◽  
Electroless Ni ◽  
Scanning Electron

Ni-Mo coated TiC powders were prepared by electroless plating technique assisted by ultrasonic wave with hydrazine as reducing agent. The surface microstructure of the Ni-Mo coated TiC powders was characterized with scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffractometry (XRD). The results showed that the as-plated powders, which were of nearly spheric shape, were the composite of TiC and Ni-Mo alloy. The Ni and Mo elements were uniformly distributed around the TiC powders with some plating leakage. In addition, the Ni-Mo plated thin layers on the surface of TiC powders were amorphous or microcrystalline in a supersaturated state. Diffraction peaks corresponding to Ni and Mo weren’t found, and the Ti (NO3)4 and an unknown phase were formed as the load decreased from 15 g/L to 5 g/L.

Calcium Deposits in the Crayfish, Cherax quadricarinatus: Microstructure Versus Elemental Distribution

2016 ◽  
Vol 22 (1) ◽  
pp. 22-38 ◽  
Author(s):  
Gilles Luquet ◽  
Yannicke Dauphin ◽  
Aline Percot ◽  
Murielle Salomé ◽  
Andreas Ziegler ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Carbonate ◽  
Thin Layers ◽  
Organic Layer ◽  
Elemental Distribution ◽  
Edge Structure ◽  
Cherax Quadricarinatus ◽  
X Ray ◽  
Scanning Electron

AbstractThe crayfish Cherax quadricarinatus stores calcium ions, easily mobilizable after molting, for calcifying parts of the new exoskeleton. They are chiefly stored as amorphous calcium carbonate (ACC) during each premolt in a pair of gastroliths synthesized in the stomach wall. How calcium carbonate is stabilized in the amorphous state in such a biocomposite remains speculative. The knowledge of the microstructure at the nanometer level obtained by field emission scanning electron microscopy and atomic force microscopy combined with scanning electron microscopy energy-dispersive X-ray spectroscopy, micro-Raman and X-ray absorption near edge structure spectroscopy gave relevant information on the elaboration of such an ACC-stabilized biomineral. We observed nanogranules distributed along chitin-protein fibers and the aggregation of granules in thin layers. AFM confirmed the nanolevel structure, showing granules probably surrounded by an organic layer and also revealing a second level of aggregation as described for other crystalline biominerals. Raman analyses showed the presence of ACC, amorphous calcium phosphate, and calcite. Elemental analyses confirmed the presence of elements like Fe, Na, Mg, P, and S. P and S are heterogeneously distributed. P is present in both the mineral and organic phases of gastroliths. S seems present as sulfate (probably as sulfated sugars), sulfonate, sulfite, and sulfoxide groups and, in a lesser extent, as sulfur-containing amino acids.

X-Ray Diffraction and Scanning Electron Microscopy Studies of Molybdenum Trioxide Prepared by Thermal Oxidation of Electrodeposited Molybdenum Sulfide

1990 ◽  
Vol 210 ◽  
Author(s):  
Daniel BÉLanger ◽  
Guylaine Laperriere ◽  
Michel Preda
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Molybdenum Trioxide ◽  
Molybdenum Sulfide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Peaks ◽  
Platelet Structure ◽  
Polycrystalline Molybdenum ◽  
Scanning Electron

AbstractScanning electron microscopy and X-ray diffraction have been used to characterize the transformation of electrodeposited molybdenum trisulfide thin film and powder to molybdenum trioxide. Scanning electron microscopy shows that the formation of molybdenum trioxide is accompanied by an enhancement of the surface area of the film as the relatively smooth molybdenum trisulfide is converted to molybdenum trioxide displaying a platelet structure. X-Ray diffraction revealed that amorphous molybdenum sulfide is converted to polycrystalline molybdenum oxide upon heating in air above 400°C. The observed diffraction peaks obtained when molybdenum sulfide was heated at 400°C for 15 min. correspond fairly well with those of orthorhombic molybdenum trioxide. However, when the molybdenum sulfide powder was heated at 400°C for a period of only about 2 min., additional diffraction peaks were observed. The latter can be attributed to monoclinic molybdenum dioxide.

Microstructure of Ti6Al4V after Ultrasound-Aided Deep Rolling

2013 ◽  
Vol 661 ◽  
pp. 141-144
Author(s):  
Li Li ◽  
Zhen Yu Fu ◽  
Tao Li ◽  
Jin Jun Liu ◽  
Zheng Yu Tian ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Microstructure ◽  
Deep Rolling ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ti6al4v Titanium Alloy ◽  
Transmission Electron ◽  
20 Nm ◽  
Scanning Electron

Ti6Al4V titanium alloy was treated by an ultrasound-aided deep rolling (UADR) process. The microstructure of UADR treated specimen was observed via using scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Results show that ultrasound-aided deep rolling produced nanocrystallized microstructure of grain scale typically less than 20 nm on the immediate surface of Ti6Al4V. A nanometer to submicron gradient structured layer penetrating to a depth of about 150 μm was formed after UADR treatment. The above improvements of surface microstructure of the UADR treated specimen is believed to be beneficial to its anti-fatigue performance.

ELECTROLESS DEPOSITION OF Ni-P ALLOYS ON CENOSPHERES BY USING SILVER AS THE CATALYST

2006 ◽  
Vol 20 (12) ◽  
pp. 715-723
Author(s):  
JIAN XU ◽  
WEIHAO XIONG ◽  
AIXIANG ZENG
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Energy Dispersive Spectroscopy ◽  
Electroless Deposition ◽  
Coating Process ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
X Ray ◽  
Electroless Ni ◽  
Scanning Electron

Electroless deposition of Ni-P alloys on cenospheres is demonstrated in the present investigation. AgNO 3 is used as an activator to replace the conventional PdCl 2 activator and [Formula: see text] in the coating bath is used as the reducing agent to replace Sn 2+ in order to lower the overall cost of the coating process. The coated cenospheres are characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX) and powder X-ray diffraction (XRD). It shows that Ni-P alloys uniformly deposit on the surface of the cenospheres under experimental conditions. The possible mechanism of electroless Ni-P alloys coating of cenospheres by using silver as the catalyst is suggested.

Development of Dense Hydroxyapatite-Ni by Modified Electroless Deposition Technique

2013 ◽  
Vol 594-595 ◽  
pp. 306-310 ◽  
Author(s):  
Sri Asliza Md Amin ◽  
Kasmuin Mohd Zaheruddin ◽  
Azmi Rahmat ◽  
Shamsul Baharin Jamaludin ◽  
R.A. Khairel
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electroless Deposition ◽  
Deposition Technique ◽  
X Ray Diffraction ◽  
X Ray ◽  
Average Hardness ◽  
Sintered Powder ◽  
Diffraction Peaks ◽  
Scanning Electron

Ni deposited on HA powder was prepared by electroless plating process without sensitization and activation treatment. The deposited powder obtained was characterized by energy dispersive spectroscopy (EDX) and x-ray diffraction (XRD). The microstructure and hardness of the sintered powder were examined by scanning electron microscopy (SEM) and Vickers hardness respectively. From the result, the nickel existence in the deposition was confirmed by the EDX analysis. The diffraction peaks at 44.5 and 64.7o (2θ) of planes (111) and (211) respectively were belong to nickel. Nickel are homogeneously dispersed in HA matrix with grain size between 0.25-2μm after sintered at 1250°C. The improvement of 93% and 180% in average hardness and flexural strength respectively were achieved with nickel presence in HA compared to pure HA.

Oxidation Behaviour of WE54 and Elektron 21 Magnesium Alloys

2011 ◽  
Vol 312-315 ◽  
pp. 483-488 ◽  
Author(s):  
Andrzej Kiełbus ◽  
Tomasz Rzychoń ◽  
Roman Przeliorz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Oxidation Kinetics ◽  
Oxidation Behaviour ◽  
X Ray Diffraction ◽  
X Ray ◽  
Parabolic Law ◽  
Supersaturated State ◽  
Kinetics Of ◽  
Scanning Electron

In the present study, the isothermal early oxidation behaviour of the WE54 and Elektron 21 alloys were studied at a temperature of 773 K in pure O2 up to 150 min. The results showed that the oxidation kinetics depending on the chemical composition and microstructure of the investigated alloys. The oxidation kinetics of these alloys in as-cast and T6 conditions obtained a parabolic law, while in supersaturated state these alloys exhibited a linear kinetics. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses indicated that an oxide film, composed of MgO and (Y,Dy)2O3 in WE54 alloy and (Nd,Gd)2O3 in Elektron 21 alloy, had been formed.

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

1984 ◽  
Vol 42 ◽  
pp. 288-289
Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Oxalate ◽  
Growth And Development ◽  
Polarized Light ◽  
Calcium Oxalate Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning 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

1976 ◽  
Vol 34 ◽  
pp. 178-179
Author(s):  
M. L. Zimny ◽  
A. C. Haller
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Body Temperature ◽  
Ground Squirrel ◽  
Alveolar Bone ◽  
X Ray ◽  
Dental Tissues ◽  
Bone Minerals ◽  
Apical Tooth ◽  
Scanning Electron

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

1995 ◽  
Vol 53 ◽  
pp. 692-693
Author(s):  
Yun Lu ◽  
David C. Joy
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Morphological Development ◽  
Early Hydration ◽  
X Ray ◽  
Blended Cements ◽  
Powder Particles ◽  
Chemical Wastes ◽  
Scanning Electron

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

1985 ◽  
Vol 43 ◽  
pp. 610-613
Author(s):  
M.G. Baldini ◽  
S. Morinaga ◽  
D. Minasian ◽  
R. Feder ◽  
D. Sayre ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cell Biology ◽  
Imaging Technique ◽  
Human Platelets ◽  
X Rays ◽  
X Ray ◽  
X Ray Imaging ◽  
Complex Phenomena ◽  
Scanning Electron

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).

Sign in / Sign up

Export Citation Format

Share Document