Journal
ULTRASONICS SONOCHEMISTRY
Volume 34, Issue -, Pages 491-495Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2016.06.031
Keywords
Ceramics; Ultrasonic brazing; Microstructure; Shear strength; Heat dissipation
Categories
Funding
- Guangdong Province Natural Science Foundation [2014A030313693]
- Shenzhen Science and Technology Plan [JCYJ20140417172620447]
- Nanshan Science and Technology Plan [KC2014JSCX0014A]
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Fluxless brazing of bare alumina with Cu was conducted with an ultrasonic-assisted brazing technique by a Zn-14wt.%Al filler. The shear strength of Cu/alumina joints (84 MPa) exhibited 27% larger than the alumina/Cu joints (66 MPa) due to different intermetallic phases and their morphologies formed in the seam under the same parameters, which are probably attributed to the transmission rate of ultrasonic energy varying with density of the ultrasonic horn-contacted materials. Overgrowth of stalactite-like CuZn5 contributes to better thermal dissipation of the ultrasonic-assisted brazed Cu/alumina joints. (C) 2016 Elsevier B.V. All rights reserved.
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