Wetting and interfacial reaction of liquid CuAg-Ti alloy on SiO2-BN ceramic

Interfacial reactions have been recognized to play a decisive role in the wettability of liquid alloys on SiO2-BN ceramic; however, the priority between interfacial reactions and spreading of droplet during wetting is still puzzling. In this work, this confusion was experimentally clarified by the sessile drop method associated with a designed wetting structure and the instantaneous solidification for a CuAg-Ti/SiO2-BN wetting system. New phases formed at the wetting interface as a result of the reactions between active Ti and hexagonal BN component while the droplet had not yet spread, confirming that the interfacial reactions occur prior to the spreading of liquid alloys. Moreover, the wettability of the system depended on the reaction products of the TiNTiB2 nanograin layer formed at the wetting interface, while the spreading was sensitive to the interfacial reaction process.

Automated summary

Experimental results demonstrate that interfacial reactions are more crucial than droplet spreading during wetting, affecting the wettability and wetting process of the system significantly.