Joining of Advanced Aluminum-Graphite Composite

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

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

© 2011 The Minerals, Metals & Materials Society. 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
Title of host publicationSupplemental Proceedings: Materials Fabrication, Properties, Characterization, and Modeling
Number of pages8
ISBN (Electronic)9781118062142
DOIs
Publication statusPublished - 20 Apr 2011
Externally publishedYes

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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
Minerals
Mechanical properties

Cite this

Hung, N. P., Velamati, M., Aguilar, E., Garza-Castañon, M. A., & Powers, M. (2011). Joining of Advanced Aluminum-Graphite Composite. In Supplemental Proceedings: Materials Fabrication, Properties, Characterization, and Modeling https://doi.org/10.1002/9781118062142.ch97
Hung, N. P. ; Velamati, M. ; Aguilar, E. ; Garza-Castañon, M. A. ; Powers, M. / Joining of Advanced Aluminum-Graphite Composite. Supplemental Proceedings: Materials Fabrication, Properties, Characterization, and Modeling. 2011.
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Hung, NP, Velamati, M, Aguilar, E, Garza-Castañon, MA & Powers, M 2011, Joining of Advanced Aluminum-Graphite Composite. in Supplemental Proceedings: Materials Fabrication, Properties, Characterization, and Modeling. https://doi.org/10.1002/9781118062142.ch97

Joining of Advanced Aluminum-Graphite Composite. / Hung, N. P.; Velamati, M.; Aguilar, E.; Garza-Castañon, M. A.; Powers, M.

Supplemental Proceedings: Materials Fabrication, Properties, Characterization, and Modeling. 2011.

Research output: Chapter in Book/Report/Conference proceedingChapter

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AB - © 2011 The Minerals, Metals & Materials Society. 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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M3 - Chapter

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Hung NP, Velamati M, Aguilar E, Garza-Castañon MA, Powers M. Joining of Advanced Aluminum-Graphite Composite. In Supplemental Proceedings: Materials Fabrication, Properties, Characterization, and Modeling. 2011 https://doi.org/10.1002/9781118062142.ch97