Joining of advanced aluminum-graphite composite

N. P. Hung, M. Velamati, E. Aguilar, M. A. Garza-Castañon, M. Powers

Research output: Contribution to conferencePaper

Abstract

Advanced aluminum graphite composites have unique thermal properties due to opposite coefficients of thermal expansion of aluminum and graphite. The thermal and mechanical properties of such composites are anisotropic due to directional properties of graphite fibers and their designed orientation. A joint of components with different fiber orientations would theoretically produce an isotropic material for thermal management purpose. This paper presents research results for welding and brazing of the composite using different joining techniques. A laser beam melts the matrix and delaminates graphite fibers. The molten aluminum reacts with graphite to form aluminum carbide Al4C3. The joint strength is compromised when laser welding at optimal conditions to minimize the carbide formation. Brazing is preferred since the low melting temperature of a filler material suppresses the formation of Al4C3while minimizing shrinkage cavities in the joint. Microstructural study and shear test confirm the success of joining this composite by laser brazing and resistance brazing with Zn-Al filler.
Original languageEnglish
Pages805-812
Number of pages8
Publication statusPublished - 27 Jul 2011
Externally publishedYes
EventTMS Annual Meeting -
Duration: 27 Jul 2011 → …

Conference

ConferenceTMS Annual Meeting
Period27/7/11 → …

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Aluminum graphite composites
Brazing
Joining
Graphite fibers
Aluminum
Carbides
Fillers
Composite materials
Graphite
Thermodynamic properties
Laser beam welding
Fiber reinforced materials
Temperature control
Laser beams
Thermal expansion
Melting point
Molten materials
Welding
Mechanical properties
Lasers

Cite this

Hung, N. P., Velamati, M., Aguilar, E., Garza-Castañon, M. A., & Powers, M. (2011). Joining of advanced aluminum-graphite composite. 805-812. Paper presented at TMS Annual Meeting, .
Hung, N. P. ; Velamati, M. ; Aguilar, E. ; Garza-Castañon, M. A. ; Powers, M. / Joining of advanced aluminum-graphite composite. Paper presented at TMS Annual Meeting, .8 p.
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Hung, NP, Velamati, M, Aguilar, E, Garza-Castañon, MA & Powers, M 2011, 'Joining of advanced aluminum-graphite composite' Paper presented at TMS Annual Meeting, 27/7/11, pp. 805-812.

Joining of advanced aluminum-graphite composite. / Hung, N. P.; Velamati, M.; Aguilar, E.; Garza-Castañon, M. A.; Powers, M.

2011. 805-812 Paper presented at TMS Annual Meeting, .

Research output: Contribution to conferencePaper

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AU - Hung, N. P.

AU - Velamati, M.

AU - Aguilar, E.

AU - Garza-Castañon, M. A.

AU - Powers, M.

PY - 2011/7/27

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AB - Advanced aluminum graphite composites have unique thermal properties due to opposite coefficients of thermal expansion of aluminum and graphite. The thermal and mechanical properties of such composites are anisotropic due to directional properties of graphite fibers and their designed orientation. A joint of components with different fiber orientations would theoretically produce an isotropic material for thermal management purpose. This paper presents research results for welding and brazing of the composite using different joining techniques. A laser beam melts the matrix and delaminates graphite fibers. The molten aluminum reacts with graphite to form aluminum carbide Al4C3. The joint strength is compromised when laser welding at optimal conditions to minimize the carbide formation. Brazing is preferred since the low melting temperature of a filler material suppresses the formation of Al4C3while minimizing shrinkage cavities in the joint. Microstructural study and shear test confirm the success of joining this composite by laser brazing and resistance brazing with Zn-Al filler.

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Hung NP, Velamati M, Aguilar E, Garza-Castañon MA, Powers M. Joining of advanced aluminum-graphite composite. 2011. Paper presented at TMS Annual Meeting, .