Technical Library | 2023-01-17 17:27:13.0
Reflow profile has significant impact on solder joint performance because it influences wetting and microstructure of the solder joint. The degree of wetting, the microstructure (in particular the intermetallic layer), and the inherent strength of the solder all factor into the reliability of the solder joint. This paper presents experimental results on the effect of reflow profile on both 63%Sn 37%Pb (SnPb) and 96.5%Sn 3.0%Ag 0.5%Cu (SAC 305) solder joint shear force. Specifically, the effect of the reflow peak temperature and time above solder liquidus temperature are studied. Nine reflow profiles for SAC 305 and nine reflow profiles for SnPb have been developed with three levels of peak temperature (230 o C, 240 o C, and 250 o C for SAC 305; and 195 o C, 205 o C, and 215 o C for SnPb) and three levels of time above solder liquidus temperature (30 sec., 60 sec., and 90 sec.). The shear force data of four different sizes of chip resistors (1206, 0805, 0603, and 0402) are compared across the different profiles. The shear force of the resistors is measured at time 0 (right after assembly). The fracture surfaces have been studied using a scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS)
New Equipment | Solder Materials
I.C.T | Antioxidant Silver Soldering Tin Lead Free Solder Bar for Solder Wave ❙ Introduction I.C.T has been working with suppliers to develop environmentally friendly lead-free solders and related materials and can now supply products that delive
Industry News | 2018-04-09 19:48:04.0
SMTA Europe announces Session 1 Technical Program on Predicting Component Life at the “Electronics in Harsh Environments Conference” to be held in Amsterdam, Netherlands, on April 25th, 2018.
New Equipment | Rework & Repair Equipment
BEST HeatShield Gel™ is a thermal shield water-based gel designed to be used in the PCB rework/repair or board assembly areas in order to provide thermal protection of electronic components. It is truly a revolutionary means to protect components. It
Please visit our main microsectional analysis page for more information. Process Sciences uses microsection for both failure analysis and process validation. Our cross sections reveal intermetallic layers, defects, and other physical characteristic
New Equipment | Solder Materials
The trace addition of Ni means fewer shorts and no shrinkage defects Ni-stabilized intermetallic layer inhibits copper erosion Reliable in harsh environments High ductility ensure long service life of joints subjected to cyclic strain SN100C is f
Industry News | 2012-02-07 16:20:22.0
Nihon Superior announces that its Senior Technical Advisor Keith Sweatman will present the paper titled “Effect of Cooling Rate on the Intermetallic Layer in Solder Joints” at the upcoming IPC APEX Expo.
New Equipment | Solder Materials
SN100C is a lead-free solder alloy developed by Nihon Superior in Japan that is comprised of tin-copper-nickel + germanium. SN100C offers user-friendly properties and has been proven in commercial production since 1999. The result of these advantages
Technical Library | 2017-06-13 17:14:59.0
For tin-rich solder alloys, 200 C (392 F) is an extreme temperature. Intermetallic growth in tin-copper systems is known to occur and is believed to bear a direct relationship to failure mechanisms. This study of morphological changes with time at elevated temperatures was made to determine growth rates of tin-copper intermetallics. Preferred growth directions, rates of thickening, and notable changes in morphology were observed.Each of four tin-base alloys was flowed on copper and exposed to temperatures between 100 C and 200 C for time periods of up to 32 days. Metallographic sections were taken and the intermetallics were examined. Intermetallic layer thickening is characterized by several distinct stages. The initial growth of side plates is extremely rapid and exaggerated. This is followed by retrogression (spheroidization) of the elongated peaks and by general thick-
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