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Selective laser sintering of composite copper–tin powders

Published online by Cambridge University Press:  12 August 2014

David C. Walker ,
William F. Caley  and
Mathieu Brochu
David C. Walker*
Affiliation:
Department of Mining and Materials Engineering, McGill University, Montréal, Quebec, Canada
William F. Caley
Affiliation:
Department of Process Engineering and Applied Science, Dalhousie University, Halifax, Nova Scotia, Canada
Mathieu Brochu
Affiliation:
Department of Mining and Materials Engineering, McGill University, Montréal, Quebec, Canada
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Selective laser sintering (SLS) is a rapidly developing additive manufacturing technique, with advantages in flexibility and low material waste. Many parameters used in a SLS process are determined by powder type: blended powders have limitations due to wetting and diffusion, while prealloyed powders require processing in a small temperature range dictated by the alloy composition. As an alternative to these, a coated powder was fabricated by electrochemical means. This tin–copper composite powder was compared with a blend of tin and copper powders, using metallographic, crystallographic, and thermal analysis techniques as well as SLS. It was found that, because of the uniform distribution of liquid and increased contact between phases in the composite powder, sintering took place in the composite powder but not in the blend. After a homogenization treatment, mechanical testing of the sintered samples showed that the strength and ductility were comparable to high-porosity materials produced using other techniques.

Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 17: Focus Issue: The Materials Science of Additive Manufacturing , 14 September 2014 , pp. 1997 - 2005
Copyright
Copyright © Materials Research Society 2014 

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References

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