Preparation method of large-gap brazed joint
A technology of brazing joints and large gaps, applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve problems such as high melting point brittle phase agglomeration, achieve rapid filling, improve performance, and avoid agglomeration effects
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Embodiment 1
[0048] In this embodiment, two types of open-cell nickel foam with porosity of 98% and 80% respectively and a thickness of 0.3 mm are selected. The selected solder metal is a Sn-In eutectic alloy, and the base material to be welded is a silver-plated aluminum alloy plate. The specific brazing process steps are as follows:
[0049] First, put the nickel foam with a size of 10×10×0.3mm3 in 10% dilute hydrochloric acid and wash it under ultrasonic waves for 4 minutes, and then place the area to be fused with a size of 20×10mm 2 The two silver-plated aluminum alloys were polished, and finally they were cleaned with Sn-In solder in absolute ethanol and then dried for use.
[0050] Then, if figure 1 As shown, nickel foam and silver-plated aluminum alloy plate are combined into a sandwich structure, and assembled into the corresponding fixture, and a pressure of 1.5MPa is applied on the upper base metal side. The nickel foam with 98% porosity is placed on the left side of the braz...
Embodiment 2
[0053] The metal foam matrix selected in this embodiment is Ni-10wt.% Cu alloy, the porosity is 98% and 80% respectively, and the thickness is 0.3 mm. The selected solder metal is a Sn-In eutectic alloy, and the base material to be welded is a silver-plated aluminum alloy plate. The specific brazing process steps are as follows:
[0054] First, set the dimensions to 10×10×0.3mm 3 The foam alloy is placed in 10% dilute hydrochloric acid and cleaned under ultrasonic waves for 4 minutes, and then the area to be fused is 20×10mm 2 The two silver-plated aluminum alloys were polished, and finally they were cleaned with Sn-In solder in absolute ethanol and then dried for use.
[0055] Then the same as figure 1 As shown, the metal foam and the base metal are combined into a sandwich structure and assembled into the fixture, and a pressure of 1.5 MPa is applied to the upper base metal side. Likewise, the large-porosity metal foam is placed on the left side of the brazing joint. Pl...
Embodiment 3
[0059] The metal foam matrix selected in this embodiment is Ni-10wt.% Cu alloy, the porosity is 98%, 90% and 70% respectively, and the thickness is 0.35mm. The selected solder metal is In-Sn, and the base material to be welded is silver-plated aluminum alloy. The specific brazing process steps are as follows:
[0060] First, place the foam alloy with a size of 10×10×0.35mm3 in 10% dilute hydrochloric acid and ultrasonically clean it for 4 minutes, and then place the foam alloy with a size of 30×10mm 2 The two silver-plated aluminum alloys were polished, and finally they were cleaned with In-Sn solder in absolute ethanol and then dried for use.
[0061] same as figure 1 As shown, the metal foam and the base metal are combined into a sandwich structure and assembled into the fixture, and a pressure of 1.5 MPa is applied to the upper base metal side. The three foam metals are placed in the brazing joint from left to right according to the porosity from large to small. Then pl...
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Abstract
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Application Information
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