Jung Do-Hyun, Rajendran Sri Harini, Jung Jae-Pil
Department of Materials Science and Engineering, University of Seoul, Seoul 02504, Korea.
Nanomaterials (Basel). 2018 Oct 3;8(10):784. doi: 10.3390/nano8100784.
Dissimilar Al 3003 and Cu tubular components were successfully brazed without interface cracking using ZrO₂ nanomaterials reinforced with Al-19Cu-11Si-2Sn filler. The filler was initially cast using an induction furnace and processed into ring form for brazing. Al-19Cu-11Si-2Sn filler with coarse CuAl₂ and Si phases (43 and 20 μm) were refined to 8 and 4 μm, respectively, after the addition of 0.1 wt. % ZrO₂ and shows significant improvement in the mechanical properties. ZrO₂ nanomaterials' induced diffusion controlled growth mechanism is found be the responsible for the refinement of CuAl₂ intermetallic and Si particles. The wettability of Al-19Cu-11Si-2Sn-0.1ZrO₂ increased to 78.17% on Cu side and 93.19% on the Al side compared from 74.8% and 89.9%, respectively. Increase in the yield strength, ultimate tensile strength, and percentage elongation were noted for the brazed joints. Microstructure of induction brazed joint with 40 kW for 6 seconds using Al-19Cu-11Si-2Sn-0.1ZrO₂ filler shows thin interfacial CuAl₂ intermetallic compound along the copper side and inter-diffusion region along the aluminum side and their respective mechanism is discussed. The tensile strength of the joints increased with increasing the nanomaterials addition and shows a base metal fracture. Analysis of fractured samples shows the effectiveness of ZrO₂ reinforced filler in crack propagation through the filler.
使用Al-19Cu-11Si-2Sn填充材料增强的ZrO₂纳米材料，成功实现了不同的Al 3003和Cu管状部件的钎焊，且无界面开裂。填充材料最初使用感应炉铸造，并加工成环形用于钎焊。添加0.1 wt.% ZrO₂后，具有粗大CuAl₂和Si相（分别为43和20μm）的Al-19Cu-11Si-2Sn填充材料分别细化至8μm和4μm，机械性能有显著改善。发现ZrO₂纳米材料诱导的扩散控制生长机制是CuAl₂金属间化合物和Si颗粒细化的原因。与分别为74.8%和89.9%相比，Al-19Cu-11Si-2Sn-0.1ZrO₂在Cu侧的润湿性提高到78.17%，在Al侧提高到93.19%。钎焊接头的屈服强度、极限抗拉强度和伸长率均有所提高。使用Al-19Cu-11Si-2Sn-0.1ZrO₂填充材料在40kW下感应钎焊6秒的接头微观结构显示，沿铜侧有薄的界面CuAl₂金属间化合物，沿铝侧有互扩散区域，并讨论了它们各自的机制。接头的抗拉强度随着纳米材料添加量的增加而增加，并呈现母材断裂。对断裂样品的分析表明，ZrO₂增强填充材料在通过填充材料的裂纹扩展中有效。
