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4343/3005/4343复合钎焊铝箔在钎焊过程中会发生皮材中的Si向芯材渗透的现象,在皮材-芯材界面上的这种效应会影响复合钎焊铝箔的连接性能及力学性能。采用差热扫描(DSC)分析了芯材组织对4343/3005/4343复合钎焊铝箔在钎焊过程中的扩散(等温)凝固现象的影响。结果发现,熔融4343皮材可在605℃保温过程中完全凝固。芯材组织显著影响扩散凝固过程。芯材为细小等轴晶粒组织,605℃保温30min熔融皮材完全凝固。对于粗大长条晶粒的芯材,由于晶界密度小且小角度晶界比例高,会显著降低Si的扩散速度,605℃保温30min后仍保留50%左右的熔融皮材。经120min保温后,熔融皮材才完全凝固。
4343/3005/4343 composite brazing aluminum foil in the brazing process will occur in the penetration of Si to the core material in the skin - core material interface will affect the composite brazing aluminum foil connection performance and Mechanical properties. The effect of core structure on the diffusion (isothermal) solidification of 4343/3005/4343 composite brazing aluminum foil during brazing was analyzed by differential scanning calorimetry (DSC). The results showed that the molten 4343 skin can be completely solidified during the heat preservation at 605 ℃. Core structure significantly affects the diffusion and solidification process. Core material is a fine equiaxed grain structure, 605 ℃ incubated 30min completely solidified molten skin. For the coarse grain of the core material, due to the small grain boundary and low angle grain boundary ratio is high, will significantly reduce the diffusion rate of Si, 605 ℃ incubated for 30min still retains about 50% of the melt skin. After 120min insulation, the molten skin completely solidified.