scholarly journals Numerical study of the random packings structure of solid metal powder particles

2017 ◽  
Author(s):  
O. B. Kovalev ◽  
A. V. Gusarov ◽  
V. V. Belyaev
Keyword(s):  
Metal Powder ◽  
Numerical Study ◽  
Solid Metal ◽  
Powder Particles ◽  
Random Packings

Computational Simulations on Melting Process of Fine Metal Powders With Laser Irradiation Welding

2009 ◽  
Author(s):  
Kazuyuki Takase ◽  
Toshiharu Muramatsu ◽  
Takahisa Shobu ◽  
Kazuyuki Tsukimori
Keyword(s):  
Stainless Steel ◽  
Metal Powder ◽  
Steel Plate ◽  
Numerical Study ◽  
Melting Process ◽  
Metal Powders ◽  
Stainless Steel Plate ◽  
Term Operation ◽  
Breeder Reactors

At the commercial use stage in sodium-cooled fast breeder reactors, securing maintenance and repair better than an equal to that of present water-cooled reactors is needed. Especially a repair technology that secures the plant integrity for long-term operation period becomes indispensable in the heat exchanger tubes of the steam generator that form the boundary of sodium and water coolants. Then the present study focused on the standardization of welding technology with a laser. An experimental study regarding the welding of a stainless steel plate with the laser using fine metal powders is being performed. Moreover, a numerical study is performed to simulate the welding of the fine metal powder on the stainless steel plate. The fine metal powder is made of iron, and is heated by the laser beam, and then melts exceeding the melting temperature. This paper reports the computational results of the welding phenomenon of some metal powders which changes from solid to liquid and liquid to solid. The results were compared with the experimental results qualitatively.

scholarly journals The deformation of metal powder particles: hardness and microstructure

2017 ◽  
Vol 207 ◽  
pp. 1200-1205 ◽  
Author(s):  
José M.C. Azevedo ◽  
André Cabrera Serrenho ◽  
Julian M. Allwood
Keyword(s):  
Metal Powder ◽  
Powder Particles

An application of universal hardness test to metal powder particles

2009 ◽  
Vol 209 (5) ◽  
pp. 2377-2385 ◽  
Author(s):  
E. Hryha ◽  
P. Zubko ◽  
E. Dudrová ◽  
L. Pešek ◽  
S. Bengtsson
Keyword(s):  
Metal Powder ◽  
Hardness Test ◽  
Powder Particles

GROWTH MECHANISM OF COILED CARBON WHISKERS

2005 ◽  
Vol 19 (15n17) ◽  
pp. 2847-2852
Author(s):  
DINGHE GUO ◽  
ZHANGBO GUO ◽  
XIANGJUN FAN
Keyword(s):  
Particle Size ◽  
High Temperature ◽  
Metal Powder ◽  
Growth Mechanism ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Cvd Method ◽  
Tube Shape ◽  
Twisted String ◽  
Powder Particles

The growth mechanism of coiled carbon whiskers was thoroughly studied. The carbon whiskers were prepared by chemical vapor deposition (CVD) at high temperature (500-650 °C) using acetylene as the carbon source and metal powder as the catalyst. The results show that the shape, diameter and pitch of the coiled carbon whiskers are dependent on the particle size of metal powder: when the sizes of metal powder particles are in the range of tens of microns, carbon whiskers have twisted string shape with diameters between 130 nm and 180 nm and a pitch of 100 to 350 nm. When the diameters of metal powder particles are about several hundred microns, tube shape of carbon whiskers with diameters between 280nm and 350 nm and a pitch between 150nm and 180nm are obtained. The range of temperature for the preparation of coiled carbon whiskers by the CVD method follows Quasi-VLS theory.

Melting metal powder particles in an inductively coupled r.f. plasma torch

1988 ◽  
Vol 19 (2) ◽  
pp. 213-226 ◽  
Author(s):  
Daniel Y. C. Wei ◽  
Bakhtier Farouk ◽  
Diran Apelian
Keyword(s):  
Metal Powder ◽  
Plasma Torch ◽  
Inductively Coupled ◽  
Powder Particles

scholarly journals Some Material Characteristics of Cold-Sprayed Structures

2007 ◽  
Vol 2007 ◽  
pp. 1-3 ◽  
Author(s):  
Victor K. Champagne ◽  
Dennis J. Helfritch ◽  
Matthew D. Trexler
Keyword(s):  
Strain Hardening ◽  
Model Calculation ◽  
Metal Powder ◽  
Impact Velocity ◽  
Cold Spray ◽  
High Velocity ◽  
Cold Spraying ◽  
Metal Powders ◽  
Rocket Nozzle ◽  
Powder Particles

The deposition and consolidation of metal powders by means of cold spray are methods whereby powder particles are accelerated to high velocity through entrainment in a gas undergoing expansion in a rocket nozzle and are subsequently impacted upon a surface. The impacted powder particles form a consolidated structure which can be several centimeters thick. The characteristics of this structure depend on the initial characteristics of the metal powder and upon impact velocity. The influence of impact velocity on strain hardening and porosity are examined. A materials model is proposed for these phenomena, and model calculation is compared with experiment for the cold spraying of aluminum.

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