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In order to reduce the cost of solder materials and retard the thermal shock of temperature-sensitive electronic components during packaging process, SnBi solder paste was explored to replace SnAgCu solder paste due to the low melting temperature. In this study, BGA structure Cu/solder-ball/solder-paste/Cu joints were designed and prepared to study the interfacial reactions and microstructural evolution...
Proton Exchange Membrane Fuel Cell (PEMFC) is a promising power generation device, so it is very meaningful to assess the health state of the PEMFC in application. This paper proposes a method to evaluate the PEMFC health state based on a geometrical approach and Mahalanobis Distance (MD). Firstly, geometry features are extracted from electrochemical impedance spectroscopy (EIS) and polarization curve...
Isothermal aging effect on the microstructure and mechanical properties of line-type Ni/Sn3.0Ag0.5Cu/Ni sandwich structure interconnects with small heights of 50 and 25 μm was investigated in this study. Microstructural analysis showed that interfacial (Ni, Cu)3Sn4 IMC layer grew thick after aging at 125 °C for 100 h with the formation of local voids and cracks due to volume shrinkage induced by the...
Software internationalization and localization are important steps in distributing and deploying software to different regions of the world. Internationalization refers to the process of reengineering a system such that it could support various languages and regions without further modification. Localization refers to the process of adapting an internationalized software for a specific language or...
The microstructural evolution and mechanical behavior of line-type Ni/Sn3.0Ag0.5Cu/Ni interconnects with a small thickness (or height) of 100 µm during isothermal aging were investigated. Microstructural analysis shows that both (Ni,Cu)3Sn4 and (Cu,Ni)6Sn5 IMC phases formed at the interface of the as-reflowed joints; however, after the aging treatment at 125 °C for 100 h or more, the interfacial (Cu,Ni)...
Rejuvenator diffusing into aged bitumen was evaluated by determining penetration and chemical components of aged bitumen with rejuvenator coat before and after diffusing experiment. Effects of temperature, time and viscosity of rejuvenator on the diffusing ability of rejuvenator into aged bitumen were investigated. Results indicated that the diffusing ability of rejuvenator into aged bitumen could...
In aging society, the capability of the aged to use products become crucial factor. Effective measures should be carried out according to the research on changes in perception ability of the aged. A safe and comfortable social environment should be provided to the age while universality of products and efficiency in using resources could also be promoted, which is crucial for the harmonious development...
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