Technical Library | 2024-06-23 21:57:16.0
Two extremes of reflow time scale for copper pillar flip chip solder joints were explored in this study. Sn-2.5Ag solder capped pillars were joined to laminate substrates using either conventional forced convection reflow or the controlled impingement of a defocused infrared laser. The laser reflow joining process was accomplished with an order of magnitude reduction in time above liquidus and a similar increase in solidification cooling rate. The brief reflow time and rapid cooling of a laser impingement reflow necessarily affects all time and temperature dependent phenomena characteristic of reflowed molten solder. These include second phase precipitate dissolution, base metal (copper) dissolution, and the extent of surface wetting. This study examines the reflow dependent microstructural aspects of flip chip Sn-Ag joints on samples of two different size scales, the first with copper pillars of 70μm diameter on 120μm pitch and the second with 23μm diameter pillars on a 40μm pitch. The length scale of Pb-free solder joints is known to affect the Sn grain solidification structure; Sn grain morphology will be noted across both reflow time and joint length scales. Sn grain morphology was further found to be dependent on the extent of surface wetting when such wetting circumvented the copper diffusion barrier layer. Microstructural analysis also will include a comparison of intermetallic structures formed; including the size and number density of second phase Ag3Sn precipitates in the joint and the morphology and thickness of the interfacial intermetallics formed on the pillar and substrate surfaces.
Industry Directory | Distributor
We are dealing with Used equipment. Rental or Leasing available. Installation and only supply good condition equipments. Master Distributor for Hepco SMT Inc . Distributor for Hover Davis and many more
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Used SMT Equipment | AOI / Automated Optical Inspection
M22XDL• Automatic Optical Inspection of PCB’s• Inspects: – SMT & THT Components (presence, type, polarity, offset, text etc)– Reflow and Wave Solder Joints (including meniscus)– Solder Paste (2 dimensional)• High Speed Digital XGA Colour Camera (Came
Technical Library | 2021-04-21 15:10:16.0
Voids affect the thermal characteristics and mechanical properties of a solder joint, thereby affecting the reliability of the solder interconnect. The automotive sector in particular is requiring the mitigation of solder voids in various electronic control modules to the minimum possible level. Earlier research efforts performed to decrease voids involved varying the reflow profile, paste deposit, paste alloy composition, stencil aperture, and thickness. Due to the various advantages they offer, the use of Ball Grid Array packages is common across all industry sectors. They are also prone to process voiding issues. This study was performed to determine if vacuum assisted reflow process can help alleviate the voids in area array solder joints. Test parameters in this study largely focused on vacuum pressure level and vacuum dwell time.
Technical Library | 2022-10-31 18:35:40.0
Voids affect the thermal characteristics and mechanical properties of a solder joint, thereby affecting the reliability of the solder interconnect. The automotive sector in particular is requiring the mitigation of solder voids in various electronic control modules to the minimum possible level. Earlier research efforts performed to decrease voids involved varying the reflow profile, paste deposit, paste alloy composition, stencil aperture, and thickness. Due to the various advantages they offer, the use of Ball Grid Array packages is common across all industry sectors. They are also prone to process voiding issues. This study was performed to determine if vacuum assisted reflow process can help alleviate the voids in area array solder joints. Test parameters in this study largely focused on vacuum pressure level and vacuum dwell time.
New Equipment | Selective Soldering
Nitrogen is an essential part of the selective soldering process. Soldering without a nitrogen atmosphere leaves solder joints open to the possibility of oxidizing. Individual components will not maintain the long term reliability expected in the har
New Equipment | Solder Materials
Nitrogen is an essential part of the selective soldering process. Soldering without a nitrogen atmosphere leaves solder joints open to the possibility of oxidizing. Individual components will not maintain the long term reliability expected in the har
Classic PCB Profiling tools are used to create a repeatable thermal process that meets the specifications required by the solder paste and or component manufacturers. Only by profiling do you have any idea of what the actual temperatures are on the c
New Equipment | Assembly Services
Benefit from our versatility and experience. We manufacture rigid printed circuit boards, rigid-flex and flexible printed circuit boards [including crimp technology]. You`ll find us flexible as far as dimensions are concerned: in addition to standard
