Papers by Author: Ya Jie Guo

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Authors: Ya Jie Guo, Jian Ping Lin, Guan Jun Qiao, Hai Yun Jin
Abstract: Copper and aluminium laminates are alternately stacked and sintered by PAS at T=743K under different pressures. Microstructure of the cross section of the samples are characterized and analyzed by means of Optical Microscope (OM), Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscope (EDS). The results show that the initial Al layers melted and produced Al-rich liquid phase during sintering at T=743K, and the Al-rich liquid phase ultimately formed complicated L layer consisting of the saturated solid solution phase Al(Cu) and the two-phase Al2Cu-Al(Cu) eutectic when the laminates was cooled to room-temperature. The interface between the Cu layer the L layer consists of solid solution(α), Al2Cu3(δ)and Al2Cu(θ) layer. Voids and cracks are not found at or near the interfaces of the polished samples. The most important effect of the pressure is to change the shapes of interfaces, which almost smooth at 10MPa but flexual at 50MPa.
Authors: Jian Ping Lin, Guan Jun Qiao, Hai Yun Jin, Ya Jie Guo, Tian Jian Lu
Abstract: In this research, the metal and ceramic laminates Ti/Al2O3, Ni/Al2O3 were prepared by PAS. The bonding interfaces of Ti/Al2O3, Ni/Al2O3 were observed and analyzed. The microstructures of laminates were observed by SEM. It was shown that the joints of the samples were tight and had not visible flaws. Moreover, the comparison of Ti/Al2O3 and Ni/Al2O3 laminates showed that the join mechanisms of them were different. Ni/Al2O3 laminates that had not apparent conversion zone were joined by diffusion and had lower bond strength. Ti/Al2O3 laminates have obvious conversion zone because Ti and oxygen have strong combining power. Three-point bending test indicated that the fracture of laminates was correlated to the bond strength of the interface.
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