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随着人们对铅毒性的认知及世界各国“限铅令”的颁布,因为铅污染问题,研究人员开始着手研究Sn-Pb焊料的代替品,迫切需要探索一种零污染、低成本的新型电子封装焊料。目前研制的新型低温无铅焊料有Sn-Cu、Sn-Ag、Sn-Bi、Sn-Zn、Sn-In二元焊料和Sn-Ag-Cu三元焊料,但由于新型低温无铅焊料存在着熔点高、抗氧化性能差等问题,有人提出通过在这些无铅焊料中加入第三或第四种合金元素改善无铅焊料的组织性能。介绍了新型低温无铅焊料的应用,制备,优缺点及对它的要求,叙述了目前新型低温无铅焊料的研究进展,并提出了新型低温无铅焊料的研究方向。 相似文献
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《有色金属与稀土应用》2002,(3):10-15
根据无铅焊料的要求与工作条件,选择了组成无铅焊料各金属元素及其最佳配比,研究了Sn-Ag-Bi-Cu系无铅合金焊料。焊料具有独特的抗氧化能力和良好的力学性能及焊接性能,抗氧化能力优于含铅焊料,主要技术性能基本接近Sn63/Pb锡铅焊料。 相似文献
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微电子互连锡基无铅焊料的发展 总被引:6,自引:0,他引:6
对国内外无铅焊料发展情况进行了综述,详细分析了当前运用广泛的Sn—Ag,Sn—Cu和Sn—Ag—Cu无铅焊料的相组织、性能等,列举了商业应用中无铅焊料的使用情况,并阐述了无铅焊料的可靠性问题、发展要求以及发展趋势等。 相似文献
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就Sn-Ag、Sn-Cu、Sn-Ag-Cu和Sn-Zn几种主要的无铅焊料合金系阐述了当前对无铅焊料腐蚀性能的研究情况。指出当前研究只关注了焊料本体的腐蚀性能,而在焊接过程中焊料熔化和凝固后的微观结构和化学等将发生变化,这些对腐蚀有很大影响。提出进一步研究应关注实际焊点与服役环境的交互作用机制。 相似文献
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《有色金属与稀土应用》2003,(3):1-3
介绍了无铅化的意义及重要性,目前无铅焊料的研究现状及需要解决的问题无铅焊料合金系列及其重要的技术指标,以及无铅化焊接用助焊剂的研究开发情况,并指出了无铅焊料的发展趋势及市场前景。 相似文献
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新型无铅焊料合金Sn-Zn-Ga的研究 总被引:14,自引:0,他引:14
以Sn-Zn合金为母合金,添加Ga元素,得到了新型的无铅焊料合金。测量了其熔点、硬度、剪切强度和可焊性等性能。研究发现,Ga元素的添加使焊料的熔点降低,熔程增大。焊料的硬度和剪切强度有所降低。焊料的铺展率增大,浸润角减小,提高了焊料的可焊性。通过实验研究确定了具有较好综合性能的焊料的成分范围。 相似文献
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Fu Guo Mengke Zhao Zhidong Xia Yongping Lei Xiaoyan Li Yaowu Shi 《JOM Journal of the Minerals, Metals and Materials Society》2009,61(6):39-44
Abstact There have been significant research efforts to improve the properties of globally recognized lead-free solders, such as Sn-Ag-Cu,
Sn-Cu, Sn-Bi, etc. Rare earth (RE) elements have been selected in the current research to be added into lead-free solders
as alloying elements in an effort to improve the comprehensive properties, such as wettability, microstructural stability,
creep resistance, and mechanical strength and integrity of the solders. This article overviews the background and rationale
for the alloy development, the fabrication techniques for RE-containing solders, the roles of RE elements, as well as current
status of RE-containing solder research. Examples of several representative RE-containing solders are introduced. The effects
of RE element addition on the wetting behavior, microstructure, and mechanical properties of certain lead-free solder alloys
are presented and analyzed. 相似文献
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针对近年来无铅钎料及焊点的蠕变失效问题,综合评述了蠕变变形行为及其在焊点可靠性评估中的应用。首先系统地介绍无铅钎料的蠕变行为,探讨含合金元素/颗粒无铅钎料蠕变性能改性机制。其次评述焊点蠕变行为,探讨焊点成分以及不同基板材料对焊点蠕变特性影响的研究进展。再次结合具体电子器件,采用有限元模拟,分析基于有限元的焊点蠕变响应及疲劳寿命预测,评估焊点可靠性。最后针对无铅钎料及焊点蠕变行为的未来发展进行展望,分析其研究中存在的问题及解决办法,为焊点可靠性进一步研究提供理论支撑。 相似文献
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Environmentally friendly solders 3-4 beyond Pb-based systems 总被引:1,自引:0,他引:1
Based on environmental considerations, global economic pressures, enacted by legislations in several countries, have warranted the elimination of lead from solders used in electronic applications.Sn3.5Ag, SnAgCu, and Sn0.7Cu have emerged among various lead-free candidates as the most promising solder alloys to be utilized in microelectronic industries.However, with the vast development and miniaturization of modern electronic packaging, new requirements such as superior service capabilities have been posed on lead-free solders.In order to improve the comprehensive property of the solder alloys, two possible approaches were adopted in the current research and new materials developed were patented.One approach was involved with the addition of alloying elements to make new ternary or quaternary solder alloys.Proper addition of rare earth element such as La and Ce have rendered solder alloys with improved mechanical properties, especially creep rupture lives of their joints.Another approach, the composite approach, was developed mainly to improve the service temperature capability of the solder alloys.Composite solders fabricated by mechanically incorporating various reinforcement particles to the solder paste have again exhibited enhanced properties without altering the existing processing characteristics.The recent progress and research efforts carried out on lead-free solder materials in Beijing University of Technology were reported.The effects of rare earth addition on the microstructure, processing properties, and mechanical properties were presented.The behaviors of various Sn-3.5Ag based composite solders were also explicated in terms of the roles of reinforcement particles on intermetallic growth, steady-state creep rate, the onset of tertiary creep, as well as the overall creep deformation in the solder joints.Thermomechanical fatigue (TMF) behavior of the solder alloys and composite solders were investigated with different parameters such as ramp rate, dwell time, etc.The damage accumulation features and residual mechanical properties of the thermomechanically-fatigued composite solder joints were compared with non-composite solder joints.To match the lead-free alloys, various types of water soluble no-clean soldering flux have also been developed and their properties were presented. 相似文献
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电子组装用无铅钎料的研究和发展 总被引:1,自引:0,他引:1
综述了近年来国际上无铅钎料的研发现状,重点介绍了无铅钎料的性能要求。指出研究无铅钎料,不只是简单地提供一种替代品,还需要考虑无铅钎料的力学性能、钎焊性能及焊点可靠性能够与传统的Sn-Pb钎料相近、钎焊设备与工艺尽量改动不大等因素,开展无铅钎料的研究具有十分重要的理论意义和实用价值。详细讨论了Sn-Ag系、Sn-Cu系和Sn-Ag-Cu系等三大系列的无铅钎料,指出无铅化电子组装面临着机遇与挑战,要想在激烈的国际竞争中赢得市场,我国必须重视无铅钎料产品的研究开发与产业化,这同时需要电子企业的全力支持与配合。 相似文献
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锡基焊料是电子丁业上广为使用的连接材料,随着环保意识的增强,人们加强了对无铅焊料的研究。文章概述了锡基无铅电子焊料的发展概况,主要介绍了Sn—Ag、Sn—Zn、Sn—Cu和Sn-Bi四种合金系焊料的最新研究进展,指出了锡基无铅焊料的应用和发展趋势。 相似文献
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电子组装用低银无铅焊料的研究进展 总被引:3,自引:0,他引:3
对目前国内外电子组装用低银无铅焊料最新的研究和应用情况进行了回顾和评述,介绍了低银无铅焊料的现状和其可靠性问题,以及国内外对几种低银无铅焊料进行的研究情况,最后着重分析和展望了低银无铅焊料研究应用的主要发展方向和趋势。 相似文献