Ultrafast ultrasonic-assisted joining of bare α-alumina ceramics through reaction wetting by aluminum filler in air. Issue 16 (December 2016)

• Record Type: Journal Article
• Authors: Ji, Hongjun; Cheng, Xiao; Li, Mingyu
• Is Part Of: Journal of the European Ceramic Society. Volume 36:Issue 16(2016)
• Page Start: 4339
• Page End: 4344
• Publication Date: 2016-12
• Subjects: α-Alumina ceramics -- Ultrasonic-assisted joining -- Wetting -- Microstructure -- Mechanical property; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2016.06.028
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Bare α-alumina ceramics were directly bonded together in air through ultrasonic-assisted joining by pure aluminum filler within seconds. It was found that rapid wetting through in-situ reaction of elemental aluminum and oxygen, undercutting of the melted aluminum on ceramic surfaces, and large scale growth of fresh nano-sized alumina particles probably combined successively during the joining, attributing to the acoustic cavitation, the streaming and the micro-jetting by ultrasound effects. Ceramic-composed joints were successfully obtained with fracture strength of 101.5 MPa within 90 s at as low as 973 K.