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Cold Spray Direct Fabrication – High Rate, Solid State, Material Consolidation

Published online by Cambridge University Press:  10 February 2011

M. F. Smith ,
J. E. Brockmann ,
R. C. Dykhuizen ,
D. L. Gilmore ,
R. A. Neiser  and
T. J. Roemer
M. F. Smith
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1130, mfsmith@sandia.gov
J. E. Brockmann
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1130, mfsmith@sandia.gov
R. C. Dykhuizen
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1130, mfsmith@sandia.gov
D. L. Gilmore
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1130, mfsmith@sandia.gov
R. A. Neiser
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1130, mfsmith@sandia.gov
T. J. Roemer
Affiliation:
Ktech Corporation, Albuquerque, NM 87106-4265
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Abstract

Direct fabrication of metal near-net shapes from a computer model typically involves melting and solidification, which can cause high residual stresses, undesirable phases, poor microstructures, rough surface finishes, warpage, and other problems. This paper describes a new technology, still under development, that might be used to directly fabricate solid, near-fulldensity, free-form shapes of many metals, and even some composite materials, at or near room temperature without melting and solidification. In this process, tentatively called Cold Spray Direct Fabrication (CSDF), powder particles in a supersonic jet of compressed gas impact a solid surface with sufficient energy to cause plastic deformation and consolidation with the underlying material by a process thought to be analogous to explosive welding. Material deposition by cold spray methods has already been successfully demonstrated by several investigators. This paper presents results of an experimental study to investigate the effects of selected process variables on cold spray particle velocities. In addition, a key technical barrier to the CSDF concept is focusing the spray stream down to dimensions that would permit a useful level of part detail, while still providing practical build rates. This paper presents results of initial research to develop an aerodynamic lens that may provide the required particle stream focusing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 542: Symposium V – Solid Freeform and Additive Fabrication , 1998 , 65
Copyright
Copyright © Materials Research Society 1999

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