Process method for preparing silver solder
A technology of silver brazing filler metal and silver powder is applied in the field of preparing silver brazing filler metal, which can solve the problems of affecting the mechanical properties and welding performance of silver-based brazing filler metals, difficult to control alloy composition, affecting production continuity, etc. The effect of short time and concise craftsmanship
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[0012] The steps of the method for preparing silver solder of the present invention include: placing silver powder and other pure metal element powders or intermediate alloy powders in a ball mill tank lined with polytetrafluoroethylene for ball milling according to a selected formula, and ball milling Put the mixed powder into the graphite crucible of the SPS system, vacuumize to 2-10Pa, and use 5-50 o C / min heating up to 900~1100 o C. The pressure is 5MPa ~ 40MPa, the pressure holding time is 10 minutes ~ 60 minutes, then the temperature is lowered and the material is taken out of the furnace, the sintered ingot is precision swaged, and then drawn into wire or rolled into sheet.
[0013] The purity of the silver powder is ≥99%, and the particle size ranges from 100 mesh to 500 mesh.
[0014] The pure metal element powder is one of copper, nickel, zinc, tin and palladium, with a purity ≥ 99% and a particle size range of 100 mesh to 500 mesh.
[0015] The master alloy powder...
Embodiment 1
[0022] Example 1 72 grams of silver powder with a purity of 99.5% and a particle size range of 100 mesh, and 28 grams of copper powder with a purity of 99% and a particle size range of 100 mesh were placed in a ball mill tank lined with polytetrafluoroethylene, and the ball-to-material ratio was 1 : 3, speed 100rpm / min, uniform mixing for 1 hour. Put the powder mixed by the ball mill into the graphite crucible of the SPS system. The size of the graphite crucible is ×10. o C / min heating up to 900 o C, the pressure is 5MPa, the holding time is 15 minutes, and then the temperature is lowered and the material is taken out of the furnace. The sintered ingot is precision swaged to Φ6, and then drawn to wire Φ1±0.05.
Embodiment 2
[0023] Embodiment 2 is that purity is 99.5%, and particle size range is 80 grams of silver powders of 200 mesh, and purity is 99%, and particle size range is 200 mesh copper-nickel master alloy powder Cu 0.9 Ni 0.1 20 grams, placed in a ball mill jar lined with polytetrafluoroethylene, the ratio of balls to materials is 1:5, the speed is 200rpm / min, and the mixture is uniformly mixed for 2 hours. Put the powder mixed by the ball mill into the graphite crucible of the SPS system. The size of the graphite crucible is Φ20×10. o C / min heating up to 1100 o C, the pressure is 20MPa, the holding time is 20 minutes, then the temperature is lowered and the material is taken out of the furnace. The sintered ingot is precision swaged to Φ6, and then rolled into a sheet of 6×0.5±0.01.
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