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Electronic assembly technology is in the transition from traditional tin-lead to lead-free. In comparison with Sn-Pb solders, high melting point and poor wettability of the lead-free solders lead to great challenge in many aspects. It has been accepted that inert N2 atmosphere can improve the wettability and reliablity of solder joints. The focus of this study is to investigate the reliability of...
Lead-free solder alloys are more easily oxygenized and have poor wettability compared to traditional Sn-Pb solder alloys, which affects solder joints reliability. Ar is the most plentiful rare inert gas. It has been accepted that, in Ar atmosphere, the oxidation of lead-free solder joints can be prevented and the wettability of lead-free solder joints can be improved. To date, however, few systemic...
Electronic assembly technology is in the transition from traditional tin-lead to lead-free. In comparison with Sn-Pb solders, high melting point and poor wettability of the lead-free solders lead to great challenge in many aspects. It has been accepted that inert N2 atmosphere can improve the wettability and reliablity of solder joints. The focus of this study is to investigate the reliability of...
Lead-free solder alloys are more easily oxygenized and have poor wettability compared to traditional Sn-Pb solder alloys, which affects solder joints reliability. Ar is the most plentiful rare inert gas. It has been accepted that, in Ar atmosphere, the oxidation of lead-free solder joints can be prevented and the wettability of lead-free solder joints can be improved. To date, however, few systemic...
According to the current circumstances, the cultivating and training of the newest armored equipments maintenance support personnel is difficult to meet army's demand all the time, and can't meet the needs of equipments development either, we researched the maintenance training simulation system which is basic to half-practicality and virtual reality technology in chief. We made the overall design...
A new concept of vibration sieve based on parallel kinematic mechanism (PKM) is proposed in this paper and a novel 2-DOF spatial parallel mechanism is also designed here. The screen box fixed on the moving platform of the parallel mechanism poses an independent vertical translation and two rotations (one rotation is independent and the other is derivative). The trajectory of the screen-surface appears...
The optimal design of symmetrical Langevin transducers using multiobjective evolutionary algorithms (MOEAs) is studied. The design problem is formulated as a constrained multiobjective optimization problem (MOP) involving continuous design variables (dimensions of the transducer) and discrete design variables (the number of piezoelectric rings and material types). The maximum vibration amplitude and...
In this paper, dicing saw process on the wafer has thick Aluminum pads on the scribe street is studied. Thick Aluminum pads wafer has bad topside chipping at Aluminum pads and the chipping out of specification limit is about 3.0%. New blade and dicing saw process are introduced to solve this issue. According the evaluation results, optimized recipe can solve the bad topside chipping on the Aluminum...
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