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Metallic Hollow Sphere Structures Manufacturing Process

Published online by Cambridge University Press:  31 January 2011

Cecile Davoine ,
A. Götzfried ,
S. Mercier ,
F. Popoff ,
A. Rafray ,
M. Thomas  and
V. Marcadon
Cecile Davoine
Affiliation:
[email protected], ONERA, BP72 - 29, Châtillon, France
A. Götzfried
Affiliation:
Gö[email protected], ONERA, BP72 - 29, Châtillon, France
S. Mercier
Affiliation:
[email protected], ONERA, BP72 - 29, Châtillon, France
F. Popoff
Affiliation:
[email protected], ONERA, BP72 - 29, Châtillon, France
A. Rafray
Affiliation:
[email protected], ONERA, BP72 - 29, Châtillon, France
M. Thomas
Affiliation:
[email protected], ONERA, BP72 - 29, Châtillon, France
V. Marcadon
Affiliation:
[email protected], ONERA, BP72 - 29, Châtillon, France
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Abstract

This paper focuses on manufacturing process of regular Metallic Hollow Sphere Structures (MHSS) through brazing technique. As a large stress level is generally confined into the necks formed by brazed spheres, the influence of the filler material on mechanical behavior of cellular metal has been studied. The microstructures of joints resulting from nickel hollow spheres brazing with different commercial fillers “MBF 30” and “MBF 1006” were compared by Scanning Electron Microscopy (SEM) and microhardness testing. These studies revealed a wide boron diffusion into nickel shells through grain boundaries for “MBF 30” brazing, with the formation of borides in a fine brittle eutectic structure. Conversely it was observed that the eutectic structure concentrates at the necks for “MBF 1006” and can be completely eliminated by diffusion-brazing, despite of the shells thinness. The uniaxial compressive tests of HSP specimens have shown two different strain mechanisms depending on brazing process.

Keywords

cellular (material type)brazingdiffusion
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1188: Symposium LL – Architectured Multifunctional Materials , 2009 , 1188-LL05-10
Copyright
Copyright © Materials Research Society 2009

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References

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