Simulation of binary vapor condensation in the presence of an inert gas

1982 ◽  
Vol 9 (6) ◽  
pp. 463-472 ◽  
Author(s):  
Ross Taylor ◽  
Matthew K. Noah
Keyword(s):  
Vapor Condensation ◽  
Inert Gas

STOCHASTIC MOLECULAR DYNAMICS OF FORMATION OF POROSITY NANOSTRUCTURES AND CONDENSATION CLUSTERS

2020 ◽  
Author(s):  
G. I. Zmievskaya ◽  
Keyword(s):  
Phase Transition ◽  
Molecular Dynamics ◽  
Computer Simulation ◽  
Kinetic Theory ◽  
Discharge Plasma ◽  
Vapor Condensation ◽  
Inert Gas ◽  
Initial Stage

Computer simulation of porosity nucleation during implantation of inert gas ions and vapor condensation in a discharge plasma is based on the equations of the kinetic theory of the initial stage of the phase transition - fluctuation nucleation.

Statistical Model for the Energy Exchange during Copper Vapor Condensation in an Inert Gas Atmosphere

2020 ◽  
Vol 2020 (8) ◽  
pp. 877-884
Author(s):  
A. E. Korenchenko ◽  
B. R. Gel’chinskii ◽  
A. G. Vorontsov ◽  
A. A. Zhukova
Keyword(s):  
Statistical Model ◽  
Energy Exchange ◽  
Vapor Condensation ◽  
Inert Gas ◽  
Copper Vapor ◽  
Gas Atmosphere

Chemical Vapor Synthesis of Nanostructured Ceramics

1994 ◽  
Vol 351 ◽  
Author(s):  
W. Chang ◽  
G. Skandan ◽  
H. Hahn ◽  
S. C. Danforth ◽  
B. Kear
Keyword(s):  
Tubular Reactor ◽  
Chemical Vapor ◽  
Growth Direction ◽  
Vapor Condensation ◽  
Inert Gas ◽  
Synthetic Process ◽  
Gas Condensation ◽  
Chemical Vapor Condensation ◽  
Nanostructured Ceramics ◽  
Nanostructured Powders

ABSTRACTA modification of the conventional inert gas condensation apparatus for making nanostructured powders, wherein as evaporative source is replaced by a chemical source, is described. The new chemical synthetic process, called chemical vapor condensation(CVC), combines rapid thermal decomposition and expansion of a precursor/carrier gas stream in a hot tubular reactor with rapid condensation of the product particle species on a cold substrate under a reduced inert gas pressure of 1-50 mbar. The process has been used to synthesize loosely agglomerated nanoparticles (6 to 10 nm) of n-SiCxNy, starting from hexamethyldisilazane (HMDS) as precursor compound. The phase, morphology, and composition of n-SiCxNy powders can be modified by heat treatment. β-SiC particles with grain size less than 10 nm form after annealing at 1300°C in flowing Ar. In a 1:1 NH3/H2 mixture n-SiCxNy powders transform into α-Si3N4 whiskers, with [100] growth direction.

Fission Gas Bubbles in Fractured UO2

1968 ◽  
Vol 26 ◽  
pp. 286-287
Author(s):  
O. M. Katz
Keyword(s):  
Electron Microscopy ◽  
Thermal Gradient ◽  
Gas Bubbles ◽  
Inert Gas ◽  
Thermal Gradients ◽  
Fission Gas ◽  
Beam Heating ◽  
Limited Application ◽  
Bubble Characteristics ◽  
Electron Beam Heating

The swelling of irradiated UO2 has been attributed to the migration and agglomeration of fission gas bubbles in a thermal gradient. High temperatures and thermal gradients obtained by electron beam heating simulate reactor behavior and lead to the postulation of swelling mechanisms. Although electron microscopy studies have been reported on UO2, two experimental procedures have limited application of the results: irradiation was achieved either with a stream of inert gas ions without fission or at depletions less than 2 x 1020 fissions/cm3 (∼3/4 at % burnup). This study was not limited either of these conditions and reports on the bubble characteristics observed by transmission and fractographic electron microscopy in high density (96% theoretical) UO2 irradiated between 3.5 and 31.3 x 1020 fissions/cm3 at temperatures below l600°F. Preliminary results from replicas of the as-polished and etched surfaces of these samples were published.

TEM study of amorphization of Cu and Ti foils by cold-rolling

1990 ◽  
Vol 48 (4) ◽  
pp. 146-147
Author(s):  
W. A. Chiou ◽  
N. L. Jeon ◽  
Genbao Xu ◽  
M. Meshii
Keyword(s):  
Solid State ◽  
Cold Rolling ◽  
High Energy ◽  
Rapid Quenching ◽  
Vapor Condensation ◽  
Metallic Alloys ◽  
Solid State Reactions ◽  
High Energy Particle ◽  
Amorphous Metallic Alloys ◽  
Thin Foils

For many years amorphous metallic alloys have been prepared by rapid quenching techniques such as vapor condensation or melt quenching. Recently, solid-state reactions have shown to be an alternative for synthesizing amorphous metallic alloys. While solid-state amorphization by ball milling and high energy particle irradiation have been investigated extensively, the growth of amorphous phase by cold-rolling has been limited. This paper presents a morphological and structural study of amorphization of Cu and Ti foils by rolling.Samples of high purity Cu (99.999%) and Ti (99.99%) foils with a thickness of 0.025 mm were used as starting materials. These thin foils were cut to 5 cm (w) × 10 cm (1), and the surface was cleaned with acetone. A total of twenty alternatively stacked Cu and Ti foils were then rolled. Composite layers following each rolling pass were cleaned with acetone, cut into half and stacked together, and then rolled again.

Inert-gas crystals with imbedded impurities

1978 ◽  
Vol 125 (6) ◽  
pp. 331-349 ◽  
Author(s):  
Boris M. Smirnov
Keyword(s):  
Inert Gas
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