Technical Library | 2023-01-17 17:12:33.0
Reflowed indium metal has for decades been the standard for solder thermal interface materials (solder TIMs or sTIMs) in most high-performance computing (HPC) TIM1 applications. The IEEE Heterogeneous Integration Thermal roadmap states that new thermal interface materials solutions must provide a path to the successful application of increased total-package die areas up to 100cm2. While GPU architectures are relatively isothermal during usage, CPU hotspots in complex heterogeneously-integrated modules will need to be able to handle heat flux hotspots up to 1000W/cm2 within the next two years. Indium and its alloys are used as reflowed solder thermal interface materials in both CPU and GPU "die to lid/heat spreader" (TIM1) applications. Their high bulk thermal conductivity and proven long-term reliability suit them well for extreme thermomechanical stresses. Voiding is the most important failure mode and has been studied by x-ray. The effects of surface pretreatment, pressure during reflow, solder flux type/fluxless processing, and preform design parameters, such as alloy type, are also examined. The paper includes data on both vacuum and pressure (autoclave) reflow of sTIMs, which is becoming necessary to meet upcoming requirements for ultralow voiding in some instances.
Technical Library | 2024-02-26 09:08:23.0
Precision Control in Electronic Assembly: Selective Wave Soldering Machine Discover the technical features of I.C.T's Selective Wave Soldering Machines, including precision flux application and innovative preheating systems. Learn how these machines redefine efficiency and reliability in electronic assembly. Introduction: Enhancing Precision Soldering: Technical Features of Selective Wave Soldering Machines by I.C.T Explore the innovative design and operation of I.C.T's Selective Wave Soldering Machines, featuring a seamless PCB handling system and modular design for enhanced assembly line flexibility. Experience precision control and efficiency with comprehensive PC controls, allowing easy adjustment of solder parameters like temperature and flux type. Automatic calibration and CCD mark positioning ensure consistent soldering quality. Detail Excellence: Enhancing Selective Wave Soldering Technology Flux System Mastery German high-frequency pulse injection valve ensures precise flux application. Optional flux nozzle jam detection simplifies maintenance. Pressure tank and precision pressure flow meter ensure consistent flux control. Preheat System Excellence Bottom IR preheating system ensures stability and efficiency. Maintenance is simplified with a tool-free mode and plug-in design. Soldering System Innovation Swedish "PRECIMETER" electromagnetic pump coil ensures stability. Stainless steel soldering pot prevents tin liquid leakage. N2 online heating system reduces solder dross. Transmission System Mastery Specially designed material profiles ensure operational stability. Thickened customized rails guarantee flawless operation. Control and Intelligence Keyence PLC+module high-end bus control system ensures stability. Industry 4.0 compliance allows guided programming and real-time data visualization. Market Promotion and Success Stories: Elevating Selective Wave Soldering Machine I.C.T's strategic market positioning has led to global success across diverse industries. Success stories from European clients highlight reliability and trust in the machine. Over 70 units sold across 20+ countries since 2022, establishing its industry-leading position. Conclusion Conclusion: I.C.T's Selective Wave Soldering Machine combines technical excellence with global market success, solidifying its leadership in precision soldering technology.
Technical Library | 2020-11-24 23:01:04.0
The miniaturization trend is driving industry to adopting low standoff components or components in cavity. The cost reduction pressure is pushing telecommunication industry to combine assembly of components and electromagnetic shield in one single reflow process. As a result, the flux outgassing/drying is getting very difficult for devices due to poor venting channel. This resulted in insufficiently dried/burnt-off flux residue. For a properly formulated flux, the remaining flux activity posed no issue in a dried flux residue for no-clean process. However, when venting channel is blocked, not only solvents remain, but also activators could not be burnt off. The presence of solvents allows mobility of active ingredients and the associated corrosion, thus poses a major threat to the reliability. In this work, a new halogen-free no-clean SnAgCu solder paste, 33-76-1, has been developed. This solder paste exhibited SIR value above the IPC spec 100 MΩ without any dendrite formation, even with a wet flux residue on the comb pattern. The wet flux residue was caused by covering the comb pattern with 10 mm × 10 mm glass slide during reflow and SIR testing in order to mimic the poorly vented low standoff components. The paste 33-76-1 also showed very good SMT assembly performance, including voiding of QFN and HIP resistance. The wetting ability of paste 33-76-1 was very good under nitrogen. For air reflow, 33-76-1 still matched paste C which is widely accepted by industry for air reflow process. The above good performance on both non-corrosivity with wet flux residue and robust SMT process can only be accomplished through a breakthrough in flux technology.
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