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Evaluating the Effect of Conformal Coatings in Reducing the Rate of Conductive Anodic Filament Formation

机译：评价保形涂层降低导电阳极丝形成速率的效果

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Conductive anodic filament (CAF) formation is a failure mode in printed wiring boards (PWB) which occurs when the circuit is operated under a high voltage gradient. Humidity also plays a factor since the boards must be stored, or operated in a humid environment. This failure mode is enhanced by certain water soluble fluxes or hot air solder leveling (HASL) fluids. The objective of this research was to examine the effect of three different conformal coatings in reducing the incidence of CAF associated with a variety of water-soluble flux formulations. To achieve this, a series of fluxes were evaluated for their propensity to enhance CAF. Several of these were chosen for further examination with acrylic, silicone and parylene C conformal coatings. Of the three conformal coatings tested only parylene C was effective in preventing CAF and dendrite formation in all cases. Silicone coatings showed bubbles present on some of the samples aged at 85 deg C for the 28-day test. Localized debonding occurred on some of the acrylic and the parylene C boards. Also, some boards exhibited localized debonding of epoxy/glass after during aging of the coating, suggested chemical interactions with flux residues creating mechanical stresses. One set of boards was subjected to higher processing temperatures similar to those that would be associated with lead-free soldering. When compared to boards processed with the same fluxes using the lower processing temperatures, the high temperature boards showed significant increase in CAF formation.

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作者
Turbini, L. J. ; Stock, S. R.;
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年度 2001
页码 1-11
总页数 11
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Printed circuits; Anodic coatings; Mechanical properties; Aging(Materials); Polymers; Chemical reactions; Filaments; Epoxy resins; Silicones; Conformal structures; Glass reinforced plastics;

机译：印刷电路;阳极涂层;机械性能;老化（材料）;聚合物;化学反应;长丝;环氧树脂;有机硅;保形结构;玻璃增强塑料;

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专利

1. PREPARATION AND EVALUATION OF ELECTROCATALYTIC OXIDE COATINGS ON CONDUCTIVE CARBON-POLYMER COMPOSITE SUBSTRATES FOR USE AS DIMENSIONALLY STABLE ANODES [J] . Brungs A., Skyllaskazacos M., Haddadiasl V. Journal of Applied Electrochemistry . 1996,第11期

机译：导电碳-聚合物复合基质上的电催化氧化膜的制备和评价，用作尺寸稳定的阳极
2. Conductive Anodic Filament (CAF) Formation Part I: the Influence of Water-Soluble Flux on Its Formation [J] . ANTONIO CAPUTO, LAURA J. TURBINI, DOUG D. PEROVIC Journal of Electronic Materials . 2010,第1期

机译：导电阳极丝（CAF）的形成第一部分：水溶性助焊剂对其形成的影响
3. Conductive Anodic Filament (CAF) Formation Part I: the Influence of Water-Soluble Flux on Its Formation [J] . Antonio Caputo, Laura J. Turbini, Doug D. Perovic Journal of Electronic Materials . 2010,第1期

机译：导电阳极丝（CAF）的形成第一部分：水溶性助焊剂对其形成的影响
4. Evaluating the Effect of Conformal Coatings in Reducing the Rate of Conductive Anodic Filament Formation [C] . Westin R. Bent, Laura J. Turbini IPC SMEMA Council APEX Exhibition Conference: Proceedings of the Technical Program Jan 19-24, 2002 San Diego, California . 2002

机译：评价保形涂层在减少导电性阳极丝形成速率方面的作用
5. Conductive Anodic Filament (CAF) Formation. [D] . Caputo, Antonio. 2010

机译：导电阳极丝（CAF）形成。
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Evaluating the Effect of Conformal Coatings in Reducing the Rate of Conductive Anodic Filament Formation

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