scholarly journals Nd–Fe–B Thick-Film Magnets Prepared by High Laser Energy Density

2015 ◽  
Vol 51 (11) ◽  
pp. 1-4 ◽  
Author(s):  
M. Nakano ◽  
K. Fujiyama ◽  
T. Yanai ◽  
M. Itakura ◽  
H. Fukunaga
Keyword(s):  
Energy Density ◽  
Thick Film ◽  
Laser Energy ◽  
Laser Energy Density ◽  
High Laser ◽  
High Laser Energy

scholarly journals Preparation of Nd-Fe-B/α-Fe nano-composite thick-film magnets on various substrates using PLD with high laser energy density above 10 J/cm2

AIP Advances ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 056223
Author(s):  
M. Nakano ◽  
H. Kondo ◽  
A. Yamashita ◽  
T. Yanai ◽  
M. Itakura ◽  
...  
Keyword(s):  
Energy Density ◽  
Thick Film ◽  
Laser Energy ◽  
Laser Energy Density ◽  
Nano Composite ◽  
High Laser ◽  
High Laser Energy

Fundamentals of radiation heat transfer in AlSi10Mg powder bed during selective laser melting

2019 ◽  
Vol 25 (9) ◽  
pp. 1506-1515 ◽  
Author(s):  
Pei Wei ◽  
Zhengying Wei ◽  
Zhne Chen ◽  
Jun Du ◽  
Yuyang He ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Energy Density ◽  
Negative Impact ◽  
Laser Energy ◽  
Melting Process ◽  
Laser Energy Density ◽  
Granular System ◽  
Laser Melting ◽  
Content Type ◽  
Powder Bed

Purpose This paper aims to study numerically the influence of the applied laser energy density and the porosity of the powder bed on the thermal behavior of the melt and the resultant instability of the liquid track. Design/methodology/approach A three-dimensional model was proposed to predict local powder melting process. The model accounts for heat transfer, melting, solidification and evaporation in granular system at particle scale. The proposed model has been proved to be a good approach for the simulation of the laser melting process. Findings The results shows that the applied laser energy density has a significantly influence on the shape of the molten pool and the local thermal properties. The relative low or high input laser energy density has the main negative impact on the stability of the scan track. Decreasing the porosity of the powder bed lowers the heat dissipation in the downward direction, resulting in a shallower melt pool, whereas pushing results in improvement in liquid track quality. Originality/value The randomly packed powder bed is calculated using discrete element method. The powder particle information including particle size distribution and packing density is taken into account in placement of individual particles. The effect of volumetric shrinkage and evaporation is considered in numerical model.

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