Laser scanning to fabricate spherical powder by “balling effect”

OUYANG Hong-wu; LIU Zhuo-min; HUANG Shi-cheng; WANG Qiong; ZHANG Xin

This study is carried on to explore a feasible approach to transfer the irregular powder,such as Ti powder and bronze powder,into spherical powder by "balling effect".The results indicate that:(1)the balling ability of mental powder can be ranked by a balling factor K which accounts for the influence of particle size,density,special thermal property,boiling point as well as laser absorbing rate;(2)when the scanning speed vequals laser power P multiplying K,the irregular particle will be transformed into spherical powder.

1. State Key Laboratory for Powder Metallurgy, Central South Universty, Changsha 410083, China

Received Date: 2007-09-25

Accepted Date: 2008-04-01

Available Online: 2008-12-25

Abstract: This study is carried on to explore a feasible approach to transfer the irregular powder,such as Ti powder and bronze powder,into spherical powder by "balling effect".The results indicate that:(1)the balling ability of mental powder can be ranked by a balling factor K which accounts for the influence of particle size,density,special thermal property,boiling point as well as laser absorbing rate;(2)when the scanning speed vequals laser power P multiplying K,the irregular particle will be transformed into spherical powder.

HTML

Reference (11)

[1]	LIU Y,CHEN L F,TANG H P,et al.Design of powder metallurgy titanium alloys and composites[J].Materials Science and Engineering,2006,418(1/2):25-35.
[2]	GU D D,SHEN Y F.Balling phenomena during direct sintering of multi-component Cu-based metal powder[J].Journal of Alloys and Compounds,2007,432(1/2):163-166.
[3]	RYU D Y,SHIN K,DROCKENMULLER E,et al.A generalized approach to the modification of solid surfaces[J].Science,2005,308(5719):236-239.
[4]	HABENICHT A,OLAPINSKI M,BURNEISTER F,et al.Jumping nanodroplets[J].Science,2005,309(5743):2043-2045.
[5]	NAHAL A,MOSTAFAVI-AMJAD J,GHODS A,et al.Laser-induced dendritic microstructures on the surface of Ag+-doped glass[J].J A P,2006,100(5):053503(1-6).
[6]	LESHANSKY A M,RUBINSTEIN B Y.Nonlinear rupture of thin liquid films on solid surfaces[J].Phys Rev,2005,E71(4):040601(1-4).
[7]	TRICE J,THOMAS D,FAVAZZA C,et al.Pulsed-laser-induced dewetting in nanoscopic metal films:theory and experiments[J].Phys Rev,2007,B75(23):235439(1-15).
[8]	TOLOCHKO N K,LAOUI T,KHLOPKOV Y V,et al.Absorptance of powder materials suitable for laser sintering[J].Rapid Prototyping Journal,2000,6(3):155-160.
[9]	GIBSON I,SHI D.Material properties and fabrication parameters in selective laser sintering process[J].Rapid Prototyping Journal,1997,3(4):129-136.
[10]	SHEN X F,WANG Y,YAO J,et al.Finite element simulation of thermal stress distribution in direct metal laser sintering[J].Laser Technology,2005,29(4):343-346(in Chinese).
[11]	BERGERON V,BONN D L,MARTIN J Y,et al.Controlling droplet deposition with polymer additives[J].Nature,2000,405(6788):772-775.

Laser scanning to fabricate spherical powder by “balling effect”

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Proportional views