An active brazing method to improve the performance of graphite/copper dissimilar material joints
A dissimilar material, active brazing technology, used in welding/welding/cutting items, welding equipment, manufacturing tools, etc., can solve the difference in thermal expansion coefficient between composite materials and molybdenum. Connection method and other issues, to achieve the effect of reducing brazing temperature, improving fluidity, and reducing residual stress at the interface
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Embodiment 1
[0057] In this example, pure tungsten is used to make the brazing jig. The assembly gap between the jig and the copper base metal is 0.2mm, and the depth of the brazing jig is not less than the thickness of the copper base material. Using Ag-31Cu-23In-2.8Ti solder, brazing graphite / copper at a brazing temperature of 690°C and a brazing time of 20 minutes, the shear strength of the brazed joint is 33MPa, and the fracture position of the joint is graphite parent material.
[0058] Step 1: Take the copper base material and the graphite base material to be connected, and perform machining, pre-grinding, polishing, ultrasonic cleaning and drying on the surfaces to be connected of the two base materials.
[0059] Step 2: Select Ag-Cu-In-Ti (Ag-31Cu-23In-2.8Ti) solder foil with a thickness of 100 μm, pickle and ultrasonically clean the solder foil and dry it.
[0060] Step 3: Put the copper base material cleaned in step 1 into the brazing fixture, and put the brazing material foil a...
Embodiment 2
[0066] In this example, TZM alloy is used to make the brazing fixture. The assembly gap between the fixture and the copper base metal is 0.1mm, and the depth of the brazing fixture is not less than the thickness of the copper base material. Using Ag-30Cu-24In-2.5Ti solder, brazing graphite / copper at a brazing temperature of 680°C and a brazing time of 30 minutes, the shear strength of the brazed joint is 35MPa, and the fracture position of the joint is graphite parent material.
[0067] Step 1: Take the copper base material and the graphite base material to be connected, and perform machining, pre-grinding, polishing, ultrasonic cleaning and drying on the surfaces to be connected of the two base materials.
[0068] Step 2: Select an Ag-Cu-In-Ti solder foil (Ag-30Cu-24In-2.5Ti) with a thickness of 80 μm, pickle and ultrasonically clean the solder foil and dry it.
[0069] Step 3: Put the copper base material cleaned in step 1 into the brazing fixture, and put the brazing mater...
Embodiment 3
[0075] In this example, Kovar 4J29 alloy is used to make the brazing fixture, and the assembly gap between the fixture and the copper base metal is 0.05mm. Using Ag-32Cu-22In-2.6Ti solder, brazing graphite / copper at a brazing temperature of 700°C and a brazing time of 15 minutes, the shear strength of the brazed joint is 31MPa, and the fracture position of the joint is graphite parent material.
[0076] Step 1: Take the copper base material and the graphite base material to be connected, and perform machining, pre-grinding, polishing, ultrasonic cleaning and drying on the surfaces to be connected of the two base materials.
[0077] Step 2: Select an Ag-Cu-In-Ti solder foil (Ag-32Cu-22In-2.6Ti) with a thickness of 50 μm, pickle and ultrasonically clean the solder foil and dry it.
[0078] Step 3: Put the copper base material cleaned in step 1 into the brazing fixture, and put the brazing material foil and graphite in turn, and ensure that the brazing material foil is placed betw...
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