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Abstract: Selective
laser sintering of a multi-component Cu-based metal powder with the Cu,
CuSn and CuP weight ratio of 55∶35∶10 has been successfully processed.
The CuSn metal powder with a lower melting point acts as the binder,
while the Cu powder with a higher melting point acts as the structural
metal. The CuP powder is taken as a fluxing agent to improve the wetting
characteristics. The dominant sintering mechanism is liquid formation
and particle rearrangement. Care should be taken to determine the
suitable processing param-
eters
(laser power of 275～400 W and scan speed of 0.03～0.06 m·s–1) in order to
ensure the melting of the binder CuSn but the non-melting of the
structural metal Cu. Under condition that the mechanism of liquid phase
sintering with partial melting of the powder prevails, increasing laser
power or decreasing scan speed can generally improve sintering density
and structural homogeneity.
Key words:selective
laser sintering Cu-based metal powder Sintering mechanism Liquid
phase sintering Processing parameters
CLC No: TG14
TG66
国家自然科学基金委员会—中国工程物理研究院联合基金(10276017)、航空科学基金(04H52061)和南京航空航天大学科研创新基金(S0403-061)资助项目.
Received 20050624, received in revised form 20060116
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