Abstract
The wetting of Ag-5 wt.% CuO (Ag-5CuO) alloy on initial/CuO-coated zirconia toughened alumina (ZTA) composite ceramic in air was studied in detail. The results showed that the contact angle of the Ag-5CuO/ZTA system rapidly decreased from 81° at 970 °C to 45° at 990 °C during the heating process, however, moderate reductions in contact angle were observed in the subsequent heating and temperature holding stages. In comparison with the contact angle of pure Al2O3, an increment of about 4° of the stable contact angle of Ag-5CuO alloy on the heterogeneous ZTA was observed. The reaction between Al2O3 and CuO can reduce the damage of the CuO-rich liquid to ZrO2 in the ZTA substrate. Both oxygen and CuO were helpful in reducing the contact angle of Ag on ZTA and enhancing the bonding of the Ag/ZTA interface. The continuous CuO coating on ZTA and the monotectic liquid containing more CuO in the region near the triple line induced reductions of more than 40° and about 10° in the contact angle, respectively, between the initial and the CuO coating-improved wetting systems.
Highlights
Advanced ceramics have wide applications owing to their outstanding properties [1,2].Among these high-profile ceramics, zirconia toughened alumina (ZTA), a kind of ceramic matrix composite, has great potential for application in the aerospace, nuclear, mechanical, electronic, and energy industries because of its good thermal stability, high strength, favorable toughness, and excellent oxidation and corrosion resistance [3,4,5]
Similar to other ceramics, the application of ZTA ceramics would be severely limited by their intrinsic brittleness
The joining of ZTA ceramic to itself or to metals is helpful in fabricating complex structures and devices that can be used in harsh circumstances, such as hightemperature, corrosion, and oxidation environments
Summary
Advanced ceramics have wide applications owing to their outstanding properties [1,2]. Among these high-profile ceramics, zirconia toughened alumina (ZTA), a kind of ceramic matrix composite, has great potential for application in the aerospace, nuclear, mechanical, electronic, and energy industries because of its good thermal stability, high strength, favorable toughness, and excellent oxidation and corrosion resistance [3,4,5]. The joining of ZTA ceramic to itself or to metals is helpful in fabricating complex structures and devices that can be used in harsh circumstances, such as hightemperature, corrosion, and oxidation environments. The commonly used brazing alloys have poor oxidation resistance, owing to the probable oxidation of their active elements, such as Ti and Zr
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
