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In our experiment the intermetallic layer (IML) formation during Infrared (IR) and Vapour Phase (VP) soldering was investigated. A testboard was designed, onto which fifty pieces of 0603 (1.5 × 0.75 mm) size chip resistors were mounted. For the soldering, profiles with different Qη factors (750, 1000, 1250 s°C) were set for both the IR and VP soldering. After soldering, the shear strength and the...
The surfaces of optoelectronic materials such as silicon, GaAs, nitrides and oxides are known to be very difficult to bond with low melting point solders (<;300°C). Small portion of active elements (3.1~4.1wt% Ti and 0.2% Ce) added into conventional SnAg solder could improve its solderability with inorganic material surfaces. In this work, some bonding experiments using active solder containing...
The increasing demand for portable electronics has led to the shrinking in size of electronic components and solder joint dimensions. The industry also made a transition towards the adoption of lead-free solder alloys, commonly based around the Sn-Ag-Cu alloys. As knowledge of the processes and operational reliability of these lead-free solder joints (used especially in advanced packages) is limited,...
The absorption behavior of Ag3Sn particles on the surface of intermetallic compounds (IMCs) formed at Sn-3.5Ag-xCu/Cu (x=0, 0.7, 1.5 wt. %) interfaces was studied. The Sn-3.5Ag-xCu/Cu solder joints were prepared by reflow soldering at 260degC for different time. The X-ray diffraction results showed that the dominant IMCs formed at Sn-3.5Ag-xCu/Cu interfaces were Cu6Sn5. For Sn-3.5Ag/Cu and Sn-3.5Ag-0...
The wetting behavior of Sn-Ag-Cu solder ball on nickel pad has been studied. SEM and EDX were employed to analyze the solder joint interfacial microstructure. Three zone-reactive wetting ring structure was found at the interface. To further study this kind of structures, solder ball attachment (SBA) and surface mount technology (SMT) were performed to prepare more samples. Experimental results show...
Conventional assessment of solder joint reliability uses either ball shear test or solder ball pull test. The test results are reported in terms of materials strength in either shear or tensile mode, and the strength values are size-dependent. Therefore these test results are largely useful only for qualitative comparison and qualification of the products. In the current effort, we aim at developing...
SnPb solder joints are an essential part for microelectronic packages manufacturing industrial for a long time. In recent year, environmental concerns and RoHS (Restriction of Use of Hazardous Substances) has demanded elimination of lead from electronics products by July 1, 2006. However, base on increasing pressures to achieve environmentally friendly electronic materials and processes, and indeed,...
To meet the urgent demands of future electronic packages, the solder joints have to become increasingly miniaturized. Compared to the large solder joints, mechanics behavior for the samll solder joints is very different, resulting in a series of reliability issues. Therefore, it is very important to understand the mechanics behavior of the small solder joints. In this paper, the shear test of the...
To enhance the ability of lead-free solder joint to resist failures induced by mechanical impact and shock, some researchers have introduced low-Ag lead-free solder. In this study, the formation and evolution of IMC, the fracture morphology and performance of solder joint between SAC 105 solder and Under Bump Metallization (UBM) have been studied after different temperature storage aging and multi-reflow...
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