CHE SIGNIFICA ZIRCALLOY IN INGLESE
Lega di zirconio
Le leghe di zirconio sono solide soluzioni di zirconio o di altri metalli, un sottogruppo comune con il marchio Zircaloy. Lo zirconio ha una sezione di assorbimento molto bassa di neutroni termici, elevata durezza, duttilità e resistenza alla corrosione. Uno degli usi principali delle leghe di zirconio è nella tecnologia nucleare, come rivestimento di barre di combustibile nei reattori nucleari, in particolare nei reattori idrici. Una composizione tipica delle leghe di zirconio nucleare è superiore al 95% in peso di zirconio e meno del 2% di stagno, niobio, ferro, cromo, nichel e altri metalli, che vengono aggiunti per migliorare le proprietà meccaniche e la resistenza alla corrosione. Il raffreddamento ad acqua delle leghe di zirconio del reattore aumenta la necessità della loro resistenza alla corrosione nodulare legata all'ossidazione. Inoltre, la reazione ossidativa dello zirconio con acqua libera gas idrogeno, che parzialmente diffonde nella lega e forma idruri di zirconio. Gli idruri sono meno densi e sono più deboli meccanicamente della lega; La loro formazione provoca blister e cracking del rivestimento - un fenomeno noto come embrittlement di idrogeno.
definizione di zircalloy nel dizionario inglese
La definizione di zircallo nel dizionario è una lega di zirconio contenente piccole quantità di stagno, cromo e nichel. Viene utilizzato nei reattori ad acqua pressurizzata.
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10 LIBRI IN INGLESE ASSOCIATI CON «ZIRCALLOY»
Scopri l'uso di
zircalloy nella seguente selezione bibliografica. Libri associati con
zircalloy e piccoli estratti per contestualizzare il loro uso nella letteratura.
1
Exergy: Theory and Applications in the Built Environment
The thickness of the zircalloy tubes is very thin, about 1 mm or less, for the
effective transmission of the neutrons, whose speed is lowered by liquid water in
order to realize the controlled chain reaction of nuclear fission. In the case of
nuclear ...
2
Metallographic and Materialographic Specimen Preparation, ...
Material Properties: Zirconium: Close-packed hexagonal, 7.14 g/cm3, 1490°C
2714°F. Hafnium: Close-packed hexagonal, 13.3 g/cm3, 1700°C 3092°F.
Zircalloy: Zirconium with tin, oxide, iron, chromium, and nickel. Comments on
Material: ...
3
Analytic Methods for Design Practice
0 10 new design inconel A inconel B zircalloy A zircalloy B New design Inconel B
Zircalloy A Zircalloy B Inconel A R e a c t i o n f o r c e ( N ) 0.1 0.2 0.3 0.4 0.5 0.6
0.7 0.8 Deflection (mm) Displacement (mm) Figure 8.23. Comparison of the new
...
4
Physics for Radiation Protection
These ceramic pellets are loaded into fuel rods of zircalloy tubing which are
welded at each end, as shown in Figure 5-19. As fissioning proceeds, gaseous
and volatile fission products migrate slowly through the ceramic fuel matrix into
the ...
5
National Conference on Radiation Shielding & Protection
2.1 Zircalloy vs Zr-Nb Pressure Tubes Indian PHWRs from KAPP-2 reactor
onwards use pressure tubes made up of Zr-Nb(2.5%) with slightly reduced
thickness The KAPP-2 core considered the same initial core loading inclusive of
35 thoria ...
L V Krishnan S M Lee Om Pal Singh India Board of Research in Nuclear Sciences Kalpakkam Chapter Indian Society for Radiation Physics,
1996
6
Understanding Solids: The Science of Materials
after heating for 1 hour? Zircalloy is a zirconium alloy used to clad nuclear fuel.
How much oxygen will diffuse through each square metre of casing in a day
under steady-state diffusion conditions, at 1000 °C, if the following apply:
diffusivity of ...
Richard J. D. Tilley,
2013
7
Summary of International Energy Research and Development ...
... AN ENVIRONMENTALGEOCHEMICALECOLOGICAL RESEARCHPROJECT,
6.0064 Zirconium Alloys FUEL ELEMENT DEVELOPMENT – PROPERTIES OF
ZIRCALLOY ENCASING TUBES MANUFACTURED BY DIFFERENT METHODS,
...
Smithsonian Science Information Exchange,
1977
8
Uranium Resource Processing: Secondary Resources
The PHWRs use zircalloy-clad-sintered natural UO2 fuel elements grouped into
assemblies. The exact number of elements which form an assembly or a bundle
to go into a reactor is a matter of the design which has to be compatible to the ...
Chiranjib Gupta, Harvinderpal Singh,
2003
9
Nuclear Pursuits: The Scientific Biography of Wilfrid ...
The us- developed material Zircalloy-2 was chosen for Npd, but already in 1958
Lewis ordered work started on a stronger material, Zr-2.5 % Nb, on the basis of
information from the Soviet Union. By 1966 ZrNb pressure tubes had been ...
10
Nuclear Electric Power: Safety, Operation, and Control Aspects
... rise 1300–1500 Formation of liquid Inconel–Zircalloy eutectic 1400–1500
Urania–Zircalloy reaction and control-rod cladding melts 1850–1950 Zircalloy
melts 2400–2650 Zirconia and Urania–Zirconia mixtures melt Furthermore,
decreasing ...
9 NOTIZIE DOVE SI INCLUDE IL TERMINE «ZIRCALLOY»
Vedi di che si parla nei media nazionali e internazionali e come viene utilizzato il termine ino
zircalloy nel contesto delle seguenti notizie.
PM-14 India report: International conference and exhibition held in …
Some of the successful R&D projects carried out at NFC include; Zircalloy loaded sintered UOx fuel pellets; removal of Hf from ZrO2; ODS ferritic martensitic steel ... «Powder Metallurgy Review | ipmd.net, mar 14»
Nuclear fuel complex likely soon at Rawatbhata
The Rawatbhata complex will have a 500 tonne per year fabrication facility and it will also have a 65 tonne per year zircalloy plant. In Rawatbhata, six nuclear ... «Times of India, gen 14»
Apple's Entirely Unnecessary But Very Cool Method Of Making The …
Another might be the zircalloy tubes used to hold the fuel in a nuclear reactor. You would much prefer to pay the extra price of making your tubes out of a solid ... «Forbes, ott 13»
Redeeming the Atom
Fukushima demonstrated what hazards lie in the catalytic tendency of zircalloy cladding to produce explosive chemical potentials at elevated core temperatures. «Power Engineering Magazine, ago 13»
Nuclear Fuel Complex to step up production, plans 2 new facilities
The process of site selection and evaluation has begun. It will also have a Zircalloy production unit, he told Business Line here today. These steps are needed to ... «Hindu Business Line, mag 13»
Large scale melt predicted at units 2 and 3
While this would put the cores at risk of damage, a reasonable cooling effect would still be expected thanks to the high thermal conductivity of the zircalloy fuel ... «World Nuclear News, mag 11»
Will Boron be the answer?
At the high temperatures, above 3400˚F, zircalloy, a special material used in the fuel rod containers, induces steam to break up into hydrogen and oxygen, and ... «Deccan Herald, mar 11»
Nukes, Black Swan Events, and Wind Turbines
The zircalloy tubing that holds the fuel pellets then starts to react with the steam, forming zirconia (which flakes off) and hydrogen gas: Zr + 2H2O –> ZrO2 + 2H2. «Artvoice, mar 11»
Materials Science and The Global Nuclear Renaissance
The sintered pellets are machined to size, inspected and then encapsulated in Zircalloy or stainless steel cladding to form fuel rods. The rods are then ... «Azom.com, gen 10»