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Metals 2017, 7(7), 247; doi:10.3390/met7070247

Interfacial Microstructure and Shear Strength of Brazed Cu-Cr-Zr Alloy Cylinder and Cylindrical Hole by Au Based Solder

State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
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Received: 6 May 2017 / Revised: 26 June 2017 / Accepted: 27 June 2017 / Published: 3 July 2017
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Abstract

Au-Ge-Ni solder was chosen for brazing of the Cu-Cr-Zr alloy cylinder and a part with a cylindrical hole (sleeve) below 550 °C. The Au based solder was first sintered on the surface of the cylinder and then brazed to the inner surface of the sleeve. The effects of the heating process, the temperature and the holding time at the temperature on the microstructure of the sintered layer on the surface of the cylinder, the brazed interfacial microstructure, and the brazed shear strength between the cylinder and the sleeve were investigated by scanning electron microscope, energy dispersive X-ray spectroscopy analysis, and tensile shear tests. By approach of side solder melt feeding and brazing under proper parameters, the voids and micro cracks due to a lack of enough solder melt feeding are greatly lessened and the brazed shear strength of 100 MPa is ensured even with large clearances around 0.01 mm. View Full-Text
Keywords: Cu-Cr-Zr alloy; brazing; Au; solder; strength; microstructure Cu-Cr-Zr alloy; brazing; Au; solder; strength; microstructure
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MDPI and ACS Style

Li, Z.; Yi, Y.; He, D.; Lai, R. Interfacial Microstructure and Shear Strength of Brazed Cu-Cr-Zr Alloy Cylinder and Cylindrical Hole by Au Based Solder. Metals 2017, 7, 247.

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