共查询到20条相似文献,搜索用时 875 毫秒
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讨论了环氧基材PCB对无铅焊锡装配的适应性、铜竭顶的可靠性,证明双氰胺固化的环氧基材不能适直无铅焊锡装配:酚醛树脂固化的环氧基材有解决此问题可能性,但都是PCB制造商们的技术决窍。 相似文献
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无铅化PCB及其对CCL基材的要求 总被引:2,自引:2,他引:0
概述了无铅化PCB的提出、要求和解决方法。着重指出:无铅化PCB的实质是提高与解决PCB耐热的可靠性问题,解决这个问题,最重要的是通过提高CCL基材中树脂的热分解温度、并与PCB工艺、焊料与焊接技术等多方面的方法,才能较全面的加以解决。 相似文献
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电子组装制造无铅化过渡涉及到方方面面,其中包括PCB制造厂家、焊料生产厂家、设备生产厂家以及电子组装厂家的共同努力。电子组装无铅化面临着三个急需要解决的问题,一是焊料的无铅化,二是元器件和印制板的无铅化,三是焊接设备的无铅化。 相似文献
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该文概述了最新颁布的 IPC4101《刚性及多层印制板用基材规范》中包括的PCB基材规格及其发展、IPC4010 对PCB基材指标体系的要求、IPC4101 对PCB基材技术要求的发展及IPC4101所涉及材料标准的发展。 相似文献
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本文以《论语》为基本出发点,结合PCB基材产业的特点,论述了儒家文化和现代企业管理的关系,儒家文化并 不过时,对PCB基材企业的发展战略具有巨大的影响力。 相似文献
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本文以《论语》为基本出发点,结合PCB基材产业的特点,论述了儒家文化和现代企业管理的关系,儒家文化并不过时,对PCB基材企业的发展战略具有巨大的影响力。 相似文献
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随着PCB设计走向高密度、精细化,以及PCB在特殊环境下应用所产生的CAF现象日益成为关注的焦点;同时随着欧盟的Robs法规的推出,PCB行业要求材料的使用以及装配过程的无铅化,特别是无铅化装配条件下,高的装配温度要求材料具有优良的耐热性才能满足装配要求。 相似文献
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Sanapala R. Sood B. Das D. Pecht M. 《Electronics Packaging Manufacturing, IEEE Transactions on》2009,32(4):272-280
The transition to lead-free soldering of printed circuit boards (PCBs) using solder alloys such as SnAgCu has resulted in higher temperature exposures during assembly compared with eutectic SnPb solders. The knowledge of PCB laminate material properties and their dependence on the material constituents, combined with their possible variations due to lead-free soldering temperature exposures, is an essential input in the laminate selection process. This paper provides laminate selection guidelines that were arrived at by assessing key material properties (glass transition temperature, coefficient of thermal expansion, decomposition temperature, and water absorption), and their responses to lead-free soldering assembly conditions. A range of commercially available FR-4 PCB laminate materials, classified on the basis of glass transition temperature (high, mid, and low), curing agents (dicyandiamide and phenolic), flame retardants (halogenated and halogen-free), and fillers (presence or absence) were studied. The laminate material properties under investigation were measured as per the IPC-TM-650 test methods before and after exposure to multiple lead-free soldering cycles. Combinatorial property analysis was conducted to investigate the causes behind variations in material properties. 相似文献
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Zhang Z.Q. Shi S.H. Wong C.P. 《Components and Packaging Technologies, IEEE Transactions on》2001,24(1):59-66
No-flow underfill process in flip-chip assembly has become a promising technology toward a smaller, faster and more cost-efficient packaging technology. The current available no-flow underfill materials are mainly designed for eutectic tin-lead solders. With the advance of lead-free interconnection due to the environmental concerns, a new no-flow underfill chemistry needs to be developed for lead-free solder bumped flip-chip applications. Many epoxy resin/hexahydro-4-methyl phthalic anhydride/metal acetylacetonate material systems have been screened in terms of their curing behavior. Some potential base formulations with curing peak temperatures higher than 200°C (based on differential scanning calorimetry at a heating rate of 5°C/min) are selected for further study. The proper fluxing agents are developed and the effects of fluxing agents on the curing behavior and cured material properties of the potential base formulations are studied using differential scanning calorimetry, thermomechanical analysis, dynamic-mechanical analysis, thermogravimetric analysis, and rheometer. Fluxing capability of the developed no-flow formulations is evaluated using the wetting test of lead-free solder balls on a copper board. The developed no-flow underfill formulations show sufficient fluxing capability and good potential for lead-free solder bumped flip-chip applications 相似文献
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日本PCB基板材料业的新动向 总被引:1,自引:0,他引:1
文章对日本PCB基板材料生产企业近一、两年来在产品品种、工艺技术、经营方针等方面的新动向作以综述,特别是它们在受到此次金融危机影响之后所发生的各种变化加以介绍与分析。 相似文献
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介绍了世界电子电路大会发展的历史,首先围绕ECWC10论文集的范围,剖析了日本两大PCB基板研发的技术特点,两公司的研发产品具有主要性能优越,综合性能平衡的特点,适应当前高频化和无铅化的发展要求。同时,也介绍了纳米技术在基板中的综合运用,最后,分析了导热性基板的研究进展。希望通过对以上有代表性的基板的剖析了解世界基板的发展趋势。 相似文献
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本文回顾了PCB制造常用的环氧树脂及其增强材料的性能和用途。同时,还介绍了代用树脂材料和代用增强材料的最新进展,如改性环氧树脂、无卤树脂、Thermount、PTFE、氰酸酯等,并就其性能进行了探讨。 相似文献
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随电子产品的功率增加、密度提高、可靠性要求提升以及无铅装配的盛行,PCB厂家及PCBA日益关注基材的耐热特性,而这些耐热特性是通过热分析手段进行检测的。本文结合生产实际情况,阐述了CCL与PCB基材的几种热分析技术指标,并剖析了二者在Tg(玻璃化温度)、Td(热裂解温度)、T260/T288(热分层时间)、Z-CTE(热膨胀系数)方面的区别与关联,希望能对大家正确地选择材料、衡量材料特性并解决PCBA对板材方面的疑惑提供些许帮助。 相似文献
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文章简介了聚苯醚树脂的优缺点,分析了松下电工新开发的PCB基板材料MEGTRON4643诸多性能,包括高频性能、IVH充填性能、无铅兼容性能、互连应力测试和耐CAF性能,MEGTRON4具有低热膨胀、高可靠性和良好加工性,主要应用于网络设备(服务器、路由器)、测量仪器等领域。 相似文献