MULTILAYER DIFFUSION BONDING OF POLYCRYSTALLINE Al2O3 TO Al ALLOYS CONTAINING Sr, Mg, AND Si

作者：Janghorban K^*

来源：Iranian Journal of Science and Technology Transaction B-Engineering, 2009, 33(B3): 241-251.

• Multilayered
• diffusion bonding
• interface
• composite
• alumina/Al

Multilayered ceramic-metal composites were produced by solid state diffusion bonding of polycrystalline alumina and three Al alloys containing I to 2%Sr, 2% Mg and Mg + Si (5057 Al alloy).
The multilayered structures were fabricated at 610 degrees C under a compressive stress of 3 MPa for 2 hours in He-5%H atmosphere. The ceramic-metal interfaces were studied by SEM and TEM equipped with an energy dispersive spectrometer (EDS). Addition of 1 wt% % Sr to Al promoted good adhesion, without producing any interfacial products, while the Al-2wt%Sr was poor in this regard due to the presence of dispersed Al4Sr, which is an intrinsic phase in the Al-Sr phase system. The Al-2%Mg alloy produced a continuous film at the interface, which was characterized as being MgAl2O4. Al alloys containing Mg and Si (5057 commercial alloy) produced not only the spinel structure (MgAl2O4), but another phase rich in Mg and Si (close to Mg2Si). These latter interfacial reaction products were not the intrinsic phases in Al-Mg alloys, but were reaction products at the Al2O3 -All alloy interfaces.

• 出版日期2009-6