نتایج جستجو برای: Nanostructured powders

تعداد نتایج: 27867  

2013
Li Li Xuan Liu Yiling Zhang Paul A. Salvador Gregory S. Rohrer

Heterostructured powders composed of microcrystalline (mc-) BaTiO3 and SrTiO3 cores coated with nanostructured (ns-) TiO2 shells were prepared using a solegel method. The influences of annealing temperature, coating thickness, cocatalyst loading, and core size on photocatalytic hydrogen production were experimentally determined. The amount of hydrogen produced depends on the annealing temperatu...

In this work, nanocrystalline Fe85Si10Ni5 soft magnetic powders were prepared by mechanical alloying and subsequent annealing to reduce the internal stresses and lattice strains. The powders were mixed with phenolic resin and warm pressed to produce nanostructured soft magnetic composites. The effect of annealing time and temperature on the crystalline structure, microstructure and magnetic pro...

2009
Yuda Yürüm Alpay Taralp T. Nejat Veziroglu

Recent developments focusing on novel hydrogen storage media have helped to benchmark nanostructured carbon materials as one of the ongoing strategic research areas in science and technology. In particular, certain microporous carbon powders, carbon nanomaterials, and specifically carbon nanotubes stand to deliver unparalleled performance as the next generation of base materials for storing hyd...

2003
Yunfei Qiao Traugott E. Fischer Andrew Dent

We have deposited a series of WC–Co coatings by the high velocity oxy fuel (HVOF) process, using three different powders, and different spray conditions. The powders are a nanocrystalline (Nanocarb), a near-nanostructured powder (Infralloy) containing a proprietary additive aimed at retarding grain growth, and multimodal (mixed micro and nano) powder (Nanomyte). HVOF spray conditions were stoic...

In this study, the effects of mechanical milling and YSZ reinforcing on oxidation behavior of CoNiCrAlY coatings were investigated. Various amounts of YSZ particles (0%, 5%, 10% and 15 wt.%) were mixed with commercial CoNiCrAlY powder and milled for 24 hrs. Then, the mechanically milled and commercial powders were deposited on Inconel 617 substrate using High Velocity Oxygen-Fuel (HVOF) process...

In plasma sprayed nanostructured composite coatings with ceramic matrix, the feedstock must consist of nanoparticles of appropriate specifications. In this research, the procedure for production of Cr2O3-Ag agglomerated nanostructured composite powder to produce comosite coatings has been investigated. Nanopowders of Cr2O3 with 0, 2, 5, and 10 volume percentages of silver were dispersed to obta...

2012
Feng Chen Yingjie Zhu Jin Wu Peng Huang Daxiang Cui

Due to the similar chemical properties to the inorganic component in calcified tissues, synthetic calcium phosphate has been considered as ideal biomaterials with excellent biocompatibility. Nanostructured calcium phosphate materials play an important role in the formation of hard tissues in nature. It is reported that calcium phosphates materials in nano-size can mimic the dimensions of consti...

Al-Zn-Mg/3 wt-% Al2O3 nanostructured composite powder was synthesized through Mechanical Alloying (MA). At first, the 7014 alloy matrix constituents were milled in a planetary ball mill for 20 hours. Then, 3 wt.% µ-Al2O3 particles were  added to the pre-milled matrix and the nanostructured composite powder was produced at different MA times to investigate the effects of MA time ...

Journal: :international journal of research in materials science 0
hossein yoozbashizadeh department of materials science and engineering, sharif university of technology, tehran, iran ali heidary moghadam department of materials science and engineering, tehran science and research branch, islamic azad university, tehran, iran valiollah dashtizad department of advanced materials and renewable energy, iranian research organization for science and technology, p.o. box13815-3538, tehran, iran ali kaflou department of advanced materials and renewable energy, iranian research organization for science and technology, p.o. box13815-3538, tehran, iran

the effect of rare earth (re) elements, including ce and la, on the sorption properties of zr-co getters was investigated in this work. the phase evolution, microstructural characteristics of getter powders were studied by means of x-ray diffraction method, scanning electron microscopy (sem) and energy dispersive x-ray spectroscopy (eds). the nanostructured zr3co intermetallic compound has been...

2004
Yuelan Zhang Heon-Cheol Shin Jian Dong Meilin Liu

Porous nanostructured spinel LiMn2O4 has been successfully synthesized using a glycine-nitrate combustion process. The average primary particle size of the as-synthesized powders was about 10 nm, but increased to about 100 nm with improved crystallinity after calcination at 800 jC for 2 h. Yet, the calcined powders were still highly porous and displayed reversible capacity of about 112 mA h g 1...

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