Technical Library | 2019-09-24 15:41:53.0
This paper focuses on three different coating material groups which were formulated to operate under high thermal stress and are applied at printed circuit board manufacturing level. While used for principally different applications, these coatings have in common that they can be key to a successful thermal management concept especially in e-mobility and lighting applications. The coatings consist of: Specialty (green transparent) liquid photoimageable solder masks (LPiSM) compatible with long-term thermal storage/stress in excess of 150°C. Combined with the appropriate high-temperature base material, and along with a suitable copper pre-treatment, these solder resists are capable of fulfilling higher thermal demands. In this context, long-term storage tests as well as temperature cycling tests were conducted. Moreover, the effect of various Cu pre-treatment methods on the adhesion of the solder masks was examined following 150, 175 and 200°C ageing processes. For this purpose, test panels were conditioned for 2000 hours at the respective temperatures and were submitted to a cross-cut test every 500 h. Within this test set-up, it was found that a multi-level chemical pre-treatment gives significantly better adhesion results, in particular at 175°C and 200°C, compared with a pre-treatment by brush or pumice brush. Also, breakdown voltage as well as tracking resistance were investigated. For an application in LED technology, the light reflectivity and white colour stability of the printed circuit board are of major importance, especially when high-power LEDs are used which can generate larger amounts of heat. For this reason, a very high coverage power and an intense white colour with high reflectivity values are essential for white solder masks. These "ultra-white" and largely non-yellowing LPiSM need to be able to withstand specific thermal loads, especially in combination with high-power LED lighting applications. The topic of thermal performance of coatings for electronics will also be discussed in view of printed heatsink paste (HSP) and thermal interface paste (TIP) coatings which are used for a growing number of applications. They are processed at the printed circuit board manufacturing level for thermal-coupling and heat-spreading purposes in various thermal management-sensitive fields, especially in the automotive and LED lighting industries. Besides giving an overview of the principle functionality, it will be discussed what makes these ceramic-filled epoxy- or silicone-based materials special compared to using "thermal greases" and "thermal pads" for heat dissipation purposes.
Industry News | 2019-11-25 11:02:32.0
SHENMAO America, Inc. announces that it will exhibit at the SMTA Silicon Valley Expo, scheduled to take place Wednesday, Dec. 4, 2019 at the Bestronics Box Build Facility in San Jose, CA. The company will showcase its PF735-PQ10 Low Temperature Solder (LTS) and SM-862 Liquid Flux.
Industry News | 2010-06-11 15:20:35.0
DENVER — Krayden, Inc., a leading silicone supplier that specializes in technical knowledge and support for high tech-based applications, introduces the 1-2577 Low VOC Coating manufactured by Dow Corning Solar Solutions.
Full automatic model with 3 axis bi-component potting compound dosing and dispensing machine, whatsapp(0086 134 2516 4065) PGB-700 system accurately meters, mixes and dispenses two-component medium to low-viscosity materials for potting, gasketing,
Whatsapp +86 134 2516 4065 Model:PGB-1500 PGB-1500 system accurately meters, mixes and dispenses two-component medium to low-viscosity materials for potting, gasketing,sealing, encapsulation and syringe filling. For variable ratio dispensing, the
Technical Library | 2021-09-15 19:00:35.0
This paper presents the use of physics of failure (PoF) methodology to infer fast and accurate lifetime predictions for power electronics at the printed circuit board (PCB) level in early design stages. It is shown that the ability to accurately model silicon–metal layers, semiconductor packaging, printed circuit boards (PCBs), and assemblies allows, for instance, the prediction of solder fatigue failure due to thermal, mechanical, and manufacturing conditions. The technique allows a lifecycle prognosis of the PCB, taking into account the environmental stresses it will encounter during the period of operation. Primarily, it involves converting an electronic computer aided design (eCAD) circuit layout into computational fluid dynamic (CFD) and finite element analysis (FEA) models with accurate geometries. From this, stressors, such as thermal cycling, mechanical shock, natural frequency, and harmonic and random vibrations, are applied to understand PCB degradation, and semiconductor and capacitor wear, and accordingly provide a method for high-fidelity power PCB modelling, which can be subsequently used to facilitate virtual testing and digital twinning for aircraft systems and sub-systems.
Whatsapp+86 13425164065 Our system accurately meters, mixes and dispenses two-component medium to low-viscosity materials for potting, gasketing,sealing, encapsulation and syringe filling. For variable ratio dispensing, the system handles ratios fro
Industry News | 2010-04-28 20:24:38.0
NASHVILLE — Kyzen, a world leading provider of environmentally responsible precision cleaning products for electronics and high-technology manufacturing operations, announces that Rich Brooks held a successful presentation at the SMTA Silicon Valley Chapter meeting, which took place on Thursday, April 22, 2010 from 3-5:30 p.m. at EET, Inc. in Reno, NV.
UV Laser Marking Machine for Glass and Ceramics LM-102 Power 3W/5W Optical maser wavelength 355nm Marking range 150mm×150mm Laser module life 20000 h Product description: UV Laser Marking Machine for Glass and Ceramics LM-102, Power 3W
UV Laser Marking Machine for Glass and Ceramics LM-102 Power 3W/5W Optical maser wavelength 355nm Marking range 150mm×150mm Laser module life 20000 h Product description: UV Laser Marking Machine for Glass and Ceramics LM-102, Power 3W
