A kind of vacuum diffusion welding method of aluminum or aluminum alloy and copper

Mon Aug 29 17:29:22 CST 2022

A vacuum diffusion welding method of aluminum or aluminum alloy and copper, characterized in that it is carried out according to the following steps: 1. Mechanically cleaning the part to be welded of aluminum or aluminum alloy, and then placing it in an acetone solution for ultrasonic cleaning for 10 to 30 minutes , to obtain the cleaned aluminum or aluminum alloy; mechanically clean the copper parts to be welded, and then place it in an acetone solution for ultrasonic cleaning for 10 to 30 minutes to obtain cleaned copper; 2. Place the cleaned aluminum or aluminum alloy in a plasma In the body-enhanced chemical vapor deposition vacuum device, the vacuum is evacuated to a pressure below 10-3Pa, the gas flow is 20sccm~60sccm, and hydrogen is introduced, and the vacuuming speed is adjusted to control the pressure in the plasma enhanced chemical vapor deposition vacuum device to 100Pa~300Pa , and the temperature is raised to 100℃~400℃ under the pressure of 100Pa~300Pa and hydrogen atmosphere; 3. After the temperature rise, adjust the vacuum pumping speed to control the pressure in the plasma enhanced chemical vapor deposition vacuum device to 200Pa~400Pa, and then Deposition is carried out under the conditions that the radio frequency power of the deposition system is 100W~200W, the pressure is 200Pa~400Pa, and the temperature is 100℃~400℃, and the deposition time is 2min~30min. After the deposition, the radio frequency power and heating power are turned off to obtain surface hydrogenation. Treated aluminum or aluminum alloy; 4. Laminate the surface hydrogenated aluminum or aluminum alloy and the cleaned copper in the relative form of the parts to be welded to obtain the laminated material, and place the laminated material in vacuum brazing In the furnace, close the vacuum chamber, open the vacuum pumping system, pump the vacuum to a pressure of 10-3Pa~10-4Pa, turn on the heating system, raise the temperature of the vacuum brazing furnace to 500℃~600℃, and then adjust the laminated material Apply a pressure of 1MPa~10MPa, then keep the temperature at 500℃~600℃ and the pressure at 1MPa~10MPa for 10min~60min, unload the pressure after heat preservation, turn off the heating system, and keep the pressure at 10-3Pa~10- Under the condition of 4Pa, the furnace is cooled to room temperature, that is, the vacuum diffusion welding method of aluminum or aluminum alloy and copper is completed.