Direct Brazing of Al/Al2O3 without Wettability of Molten Metal

doi:10.15541/jim20150497

Abstract

Abstract:

Al₂O₃cannot be directly brazed with aluminum due to the poor wettability of aluminum on alumina below 850℃. Based upon effect of sputtered aluminum wetting on Al₂O₃, a direct brazing method was proposed to utilize sputtered Al-based films as brazing fillers on alumina. The results show that direct brazing of Al₂O₃by Al and Al-Cu alloy can be achieved at 680℃ in vacuum with vacuum level only of 0.1 Pa. Through this method, the shear strength of joint with pure Al as brazing filler is 115 MPa and that with Al-1.6at% Cu is up to 163 MPa. When the Cu content in the Al-Cu alloy increases to 14.3at%, the shear strength of joint decreases to 127 MPa, due to the joint fracture generating at the interface caused by the interfacial segregation of Cu. Moreover, the principle of this direct brazing method not based on wettability of molten metal is analyzed.

Key words: brazing, wettability, alumina, joint strength, aluminum alloy

CLC Number:

TQ174
TG454

CHEN Fan, SHI Kai-Cheng, SUN Shi-Yang, ZHAO Bo-Wen, SHANG Hai-Long, LI Ge-Yang. Direct Brazing of Al/Al₂O₃ without Wettability of Molten Metal[J]. Journal of Inorganic Materials, 2016, 31(6): 602-606.

Figures/Tables 4

Fig. 1 Shear strength of the brazing joints with filler metals containing various Cu contents

Fig. 2 SEM images of the brazing joints with different Cu content fillers. (a) Pure Al; (b) Al-1.6at% Cu; (c) Al-14.3at% Cu; and (d) Cu X-ray map corresponding to area of (c)

Fig. 3 Shear fracture morphologies of the brazing joints with different brazing fillers through optical microscope with a large depth of field. (a) Pure Al; (b) Al-1.6at% Cu; (c) Al-14.3at% Cu

Fig. 4 Three-dimensional morphologies of Al films after melting through optical microscope with a large depth of field. (a) Al2O3/ Cu(50 nm)/Al(7 μm) sample; (b) Al2O3/Al(50 nm)/Cu (50 nm)/Al(7 μm) sample

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Direct Brazing of Al/Al₂O₃ without Wettability of Molten Metal

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