Mechanical behavior and microstructural analysis of alumina–titanium brazed interfaces

Interface behavior of Al2O3/Ti joints produced by liquid state bonding

“…The reaction product layer should provide a strong bond between the two dissimilar materials, which means: (i) it should accommodate for the thermo-mechanical mismatch resulting from differences in thermal expansion coefficients, and (ii) the reaction product layer should not consist of compounds that have mechanical properties significantly inferior to those of the metal and the ceramic (He et al, 2010;Roy et al, 2009). Al 2 O 3 has been widely used as a very promising structural ceramics in a variety of engineering applications due its excellent performance in various severe working environments (Walker and Hodges, 2008;Nono et al, 2006). The use of copper as a reactive system for joining metals to Al 2 O 3 has significant potential as an active element, in particular for the active brazing.…”

Bonding Mechanisms and Shear Properties of Alumina Ceramic/Stainless Steel Brazed Joint

“…The joining of high-purity Al 2 O 3 ceramics has now become a well-established practice, including the sintering metal powder process (Mo-Mn process) (Ref [1][2][3][4], active metal brazing ( Ref 4,5), and the partial transient liquid phase (PTLP) technique ( Ref 6,7). Compared with the conventional Mo-Mn process, activated Mo-Mn process is more commonly used in industry for highpurity Al 2 O 3 ceramic-metal seals, with metallizing formula added with active agent, such as Al 2 O 3 and SiO 2 .…”

Joining of partially sintered alumina to alumina, titanium, Hastealloy and C–SiC composite using Ag–Cu brazes

“…Scant information was, however, found on the effect of porosity in Al 2 O 3 on its brazing response. In Mo-Mn film-coated Al 2 O 3 in contact with an Ag-Cu brazing alloy, Nono et al 5 observed that the alumina superficial pores were filled with Mo and Cu from the braze filled the pores in the Mo-Mn film. Generally, braze spreading is adversely affected by roughness and surface defects such as voids due to grain pull-out during polishing, which lead to large contact angles and poor wettability of porous ceramics by molten braze alloys.…”