Preparing 3D Functional Gradients for SLS

Abstract:

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The creation of three dimensional functional graded materials by powder processing methods requires the capability to arrange a sequence of two dimensional images that can be presented to a solid freeforming device. Planar stacking methods can only achieve a one dimensional gradient. We describe the acoustic control of powder metering and dispensing valves in which the flow rate and switching of powders from a capillary can be controlled using the frequency and amplitude of acoustic vibration from a computer sound card. An orchestra of such valves can be used to pattern layers of powder on the building platform which forms part of a 3-axis table in the Selective Laser Sintering (SLS) process. Patterns and gradients were prepared using copper and steel powders.

Info:

Periodical:

Materials Science Forum (Volumes 492-493)

Edited by:

Omer Van der Biest, Michael Gasik, Jozef Vleugels

Pages:

749-754

DOI:

10.4028/www.scientific.net/MSF.492-493.749

Citation:

S. F. Yang and J. R.G. Evans, "Preparing 3D Functional Gradients for SLS", Materials Science Forum, Vols. 492-493, pp. 749-754, 2005

Online since:

August 2005

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Price:

$35.00

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