Technical Library | 2015-02-12 16:57:56.0
Electronic systems are known to be affected by the environmental and mechanical conditions, such as humidity, temperature, thermal shocks and vibration. These adverse environmental operating conditions, with time, could degrade the mechanical efficiency of the system and might lead to catastrophic failures.The aim of this study is to investigate the mechanical integrity of lead-free ball grid array (BGA) solder joints subjected to isothermal ageing at 150°C for up to 1000 hours. Upon ageing at 150°C the Sn-3.5Ag solder alloy initially age-softened for up to 200 hours. This behaviour was linked to the coarsening of grains. When aged beyond 200 hours the shear strength was found to increase up to 400 hours. This age-hardening was correlated with precipitation of hard Ag3Sn particles in Sn matrix. Further ageing resulted in gradual decrease in shear strength. This can be explained as the combined effect of precipitation coarsening and growth of intermetallic layer. The fractured surfaces of the broken solder balls were also investigated under a Scanning Electron Microscope. The shear failures were generally due to ductile fractures in bulk solders irrespective of the ageing time.
New Equipment | Solder Materials
Foreverest™ AX-X Colorless Fully Hydrogenated Rosin is refined from hydrogenated rosin or high-hydrogenated rosin that are eliminated foreign matter. With the benefit of colorless is applied as solid and liquid solder flux. AX-X (http://forevere
Standard: ASTM B338, ASTM B337, ASTM B861 Grade: Gr1 Gr2 Gr3 Gr5 Gr6 Gr7 Gr9 etc. Size(mm): OD 1.5~420 WT 0.3~16 Length 18000 Titanium alloy at high temperature has excellent elasticity, widely used i
New Equipment | Solder Materials
CGEHR is a kind of super light color tackifying rosin resin, which is esterified from refined hydrogenated rosin and edible glycerol, and through series combined technologies units of catalytic hydrogenation. With benefit of light color, low odor, go
New Equipment | Solder Materials
CGEHR is a kind of super light color tackifying rosin resin, which is esterified from refined hydrogenated rosin and edible glycerol, and through series combined technologies units of catalytic hydrogenation. With benefit of light color, low odor, go
New Equipment | Solder Materials
CPEHR is a kind of super light color tackifying polyols resin, which is esterified from refined gum rosin by pentaerythritol, and through series combined technologies units of catalytic hydrogenation. With benefit of light color, low odor, good heat
New Equipment | Solder Materials
CPEHR is a kind of super light color tackifying polyols resin, which is esterified from refined gum rosin by pentaerythritol, and through series combined technologies units of catalytic hydrogenation. With benefit of light color, low odor, good heat
See the Nu/Clean Aqua Batch Aqueous Batch Cleaner in operation! Quick, quiet, close loop cleaning at a great price! For technical specifications, visit our website www.TechnicalDev.com.
See the Nu/Clean Aqua Batch Aqueous Batch Cleaner in operation! Quick, quiet, close loop cleaning at a great price! For technical specifications, visit our website www.TechnicalDev.com.
Industry News | 2011-01-14 13:02:52.0
Bliss Industries Inc. introduces new Magazine Transfer Carts with custom width rollers for specific-sized magazines on a custom basis.
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