Joining of Advanced Aluminum-Graphite Composite

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

Resultado de la investigación

Resumen

© 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.
Idioma originalEnglish
Título de la publicación alojadaSupplemental Proceedings: Materials Fabrication, Properties, Characterization, and Modeling
Número de páginas8
ISBN (versión digital)9781118062142
DOI
EstadoPublished - 20 abr 2011
Publicado de forma externa

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  • Citar esto

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