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Lee-Ho Su Yee-Wen Yen Chao-Ching Lin Sinn-Wen Chen 《Metallurgical and Materials Transactions B》1997,28(5):927-934
The interfacial reactions of molten Sn and molten In with solid Cu substrate were determined by studying their reaction couples.
The annealing temperature was 300 °C. The phases formed at the interface were examined by optical microscopy, scanning electron
microscopy, and electron probe microscopy analysis (EPMA). The thickness of the reaction layers was measured using an image
analyzer. For Cu/Sn couples, two phases, ε and η, were found. Only the Cu11In9 phase was observed at the interface of the Cu/In couples. In comparison with the results of couples of solid Sn and solid
In with solid Cu substrate, their phase formation sequences were similar; however, the interfacial morphology and the reaction
rates were different. For the liquid/solid couples, the reaction rate was much faster and the interface was nonplanar. A mathematic
model was also proposed to describe the dissolution of the Cu substrate and the growth of the intermetallic compounds. Fast
dissolution of the substrate was observed in the beginning of the reaction and was followed by a relatively slow growth of
the intermetallic compounds at the interface. 相似文献
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采用非平衡态的高能铜离子注入技术,对钼芯材表面进行改性并一次覆铜形成过渡铜层,将原本不固溶的的钼/铜界面转化为铜/铜界面,制得高界面结合强度的铜/钼/铜叠层复合材料;采用近终形的热等静压复合技术进行二次覆铜,结合小变形量冷轧工艺进行复合板材精整,降低各层协同变形量,保证了叠层复合材料的板形、芯层质量、表面粗糙度及平行度。本方法所制备的铜/钼/铜叠层复合材料具有界面结合强度高、板形良好、芯层质量好且平行度好的优点,可作为一种电子封装材料或热沉材料应用于电子、信息技术领域。 相似文献
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In this study, Cu/SiC and Cu/SiC/graphite nano-composite coatings were prepared by using pulse current electrodeposition technique. The effects of pulse parameters and graphite particles concentration of the bath on co-deposition of these particles were investigated. Morphology, composition, structure, microhardness, tribological behaviour and corrosion properties of Cu/SiC/graphite coatings were studied and compared to those of the substrate and Cu/SiC films. The results revealed that the optimum current density, pulse frequency and duty cycle for obtaining the highest graphite content within the coatings were 12?A?dm?2, 15?Hz and 5%, respectively. According to X-ray diffraction results, all the coatings had face-centred cubic structure, but with different preferred orientations. While Cu/SiC coatings had higher hardness and corrosion resistance than the Cu/SiC/graphite hybrid composites, the lowest wear rate was obtained at Cu/6.8vol.-% SiC/6.7vol.-% graphite hybrid composite film. 相似文献
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Li Yang Jinguo Ge Yaocheng Zhang Jun Dai 《Transactions of the Indian Institute of Metals》2017,70(9):2429-2439
Thermal aging behavior on the intermetallic compounds (IMCs) layer and mechanical properties of Cu/Sn–0.7Cu/Cu and Cu/Sn–0.7Cu–0.05Ni/Cu joints has been investigated from aging temperature of 60–180 °C for 100 h. Layer thickness increases as aging temperature rose for both the joints. Mechanical properties deteriorates with increase in aging temperature. After aging at 180 °C, any signs of ductile fracture surface with a large amount of dimples are absent. Instead, an intergranular fracture surface is obtained for both the joints, indicating that the process transformes from ductile to brittle behavior. However, brittle Cu3Sn layer is observed between Cu6Sn5 layer and Cu substrate for Cu/Sn–0.7Cu/Cu joint after aging at 60 °C, while (Cu, Ni)3Sn IMC layer is detected until aged at 140 °C for Cu/Sn–0.7Cu–0.05Ni/Cu. Compared with Cu/Sn–0.7Cu/Cu joint, the interfacial morphology directly changes from scallop-shaped into layer-shaped structure with lower Gibbs free energy, and the layer thickness is obviously suppressed after addition of Ni particle. Excellent mechanical properties, including UTS, elongation, and hardness, are obtained for Cu/Sn–0.7Cu–0.05Ni/Cu because of the slight increase in layer thickness and dense layer-shaped interfacial morphology. Thermal aging reliability is enhanced for the Cu/Sn–0.7Cu–0.05Ni/Cu solder joint after doping with 0.05 wt% Ni particle. 相似文献