Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 257, Issue -, Pages 1-6Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2018.02.011
Keywords
Sapphire; Ultrasonic-assisted brazing; Ultrasonic-assisted coating; Composite joint; Shear strength
Funding
- National Natural Science Foundation of China [51435004, 51375117, 51605141]
- Natural Science Foundation of Jiangsu Province [BK20160285]
- Fundamental Research Funds for the Central Universities [2015B30414]
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A method of lowering the coefficient of thermal expansion (CTE) of a bond metal of sapphire joints was examined for inhibiting the interfacial cracking of joints. An interlayer with the sandwich structure of Zn-A1/(SiCp/A356)/Zn-Al was fabricated and the surface of sapphire blocks was coated with a Zn-Al alloy by assistance of ultrasound. The assembly of sapphire and interlayer was brazed under the action of ultrasound. A metallurgical bond is performed between the sapphire and interlayer, and the composite material of SiCp/A356 is dissolved by Zn-Al alloys during brazing, resulting in a joint consisting of a new composite material of SiCp/Zn-Al-Si. It was composed of Zn-Al-Si alloy matrix and SiC particles with similar to 40 vol.%, and has a CTE of similar to 7.4 x 10(-6) /degrees C estimated by using Turner's model, approaching that of sapphire (similar to 5 x 10(-6) /degrees C). The maximum shear strength of the composite joints reached similar to 155 +/- 10 MPa, an increase of similar to 250% in comparison with that joined using the Zn-Al alloys.
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