Wettability of silicon nitride ceramic composites by silver, copper and silver copper titanium alloys

Characterization of the Si3N4/Si3N4 joints fabricated using particles modified braze

“…Among the joining methods [2][3][4][5][6], the active brazing method is considered as one of the most promising techniques for joining Si 3 N 4 ceramics to themselves or to metals. Most of the focus on active brazing of Si 3 N 4 ceramic has been directed toward the use of commercial filler alloys based on Ag-Cu eutectic, containing about 2-4 wt% Ti, which readily formed a strong joint [7,8]. However, a large residual stress inevitably resided in the joint after brazing due to CTE mismatch between the joined materials, affecting joint reliability during subsequent service [9][10][11].…”

Universal Soldering of Lithium and Sodium Alloys on Various Substrates for Batteries

“…The poor wettability of molten Li against garnet substrates also makes it unfeasible to directly coat Li metal on garnet SSEs. [41][42][43] To improve the wettability between liquid metals and ceramic substrates, alloying elements were normally added to tune the surface energy of the liquid metals and significantly decrease the contact angle on ceramic substrates. [36,37] However, for large-scale practical applications, this additional surface modification step under high vacuum is time-consuming and an additional cost.…”

“…In the previous work, [36][37][38][39][40] the wettability of garnet pellets against molten Li was significantly improved by coating a modification layer on the garnet surface, and the interfacial resistance was decreased from more than 1000 Ω cm 2 to as low as 1-20 Ω cm 2 . [41,43,44] Recently, with the rise in solid-state Li metal batteries, the metal-ceramic contact has become a critical challenge toward the development of high energy density and safe energy storage devices.The high theoretical specific capacity of lithium (Li) metal and the nonflammability of solid-state electrolytes (SSEs) make the solid-state Li metal battery a promising option to develop safe batteries with high energy density. Therefore, a lower cost and more effective method is still strongly desired to solve the interfacial problem between Li metal anode and garnet SSEs for practical solid-state Li metal batteries.…”

Liquid metal/ceramic interactions in the (Cu, Ag, Au)/ZrB2 systems

“…Fe-C case at metallic ceramic interfaces 50 the charge density in the middle of the bond is 0.12 electrons/(a.u.) 3 .…”

“…2 Two ways are widely used: one is to modify the ceramic surface by some specific coatings, in order to let the braze metals spread on this new surface, the other one is to add reactive elements to the braze which can form intermediate products at the interface more readily wetted by the liquid alloy. For example, the addition of Ti to Ag or Cu alloys involves the formation of Ti compounds (TiO x , TiC or TiN on oxides, carbides and nitrides, respectively [3][4][5] ) at the metal-ceramic interface which, due to their more "metallic" character, are wetted better than the underlying ceramic. Active metal additions can also act through an adsorption process, where the additional element accumulates at the solid-liquid interface lowering the interfacial energy and, as a consequence, the contact angle affecting also the spreading kinetics.…”