共查询到18条相似文献,搜索用时 921 毫秒
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EBGA焊点形态预测与可靠性分析 总被引:4,自引:0,他引:4
基于能量最小原理对装配后的EBGA焊点形态进行了预测。采用统一型粘塑性Anand本构方程描述了Sn63Pb37合金的粘塑性力学行为,采用非线性有限元方法研究了EBGA焊点在热循环条件下的应力应变过程及其特殊性,应用基于能量和损伤累积的Darveaux方法预测了EBGA焊点的热循环寿命。 相似文献
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利用SMT全自动回流焊机和高温恒温试验箱,制备出经2次回流焊且不同时效处理时间的Sn-Ag3.0-Cu0.5/Cu焊点试件,对其金属间化合物(IMC)的厚度进行测量,发现其厚度的增长与时效时间的平方根近似成线性关系。采用统一粘塑性Anand本构模型来描述焊点的力学性能,运用有限元计算软件ANSYS对PBGA构件进行热循环模拟,对其在不同IMC厚度下的应力和应变响应进行分析。结果表明,芯片右下方焊点右上角热循环结束后累积的等效塑性应变最大,是整个PBGA构件的关键焊点;随着IMC厚度的增加,关键焊点热循环过程中的等效应力水平不断降低,相应剪切塑性应变范围Δγ不断增大,热疲劳寿命Nf则不断降低;升温和高温保温过程中剪切塑性应变的增加量构成了剪切塑性应变范围Δγ,且不同IMC厚度下升温段剪切塑性应变增加量占Δγ的比例基本维持在95%左右 相似文献
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NRTL方程是在化工热力学中广泛应用的方程之一,0「经的显著优点可以仅用二元数据预测三元系热力学性质。但该方程对于冶金过程中的液态合金及其它熔体的应用还极少见到。本文用NRTL方程差联以Cd-Bi-Sn,Cd-Bi-Pb,Cd-Sn-Pb液态合金体系所涉及的二元系活度系数数据,并对三元系活度数据和Cd-Bi-Pb-Sn四元系中Cd的活度进行了预测。 相似文献
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叙述了锡-铅-稀土(RE)焊料焊点循环的可靠性,指出了熔制Sn-Pb-RE焊料的技术关键,提出了生产工艺规程路线。 相似文献
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SnPb solders have been widely used in many fields because of their excellent solderability. To respond to environmental and
health concerns regarding SnPb solders, it is necessary to develop lead-free solder for electronic assembly. In this paper,
the resistance to the electrochemical migration of eutectic SnPb and SnBi solder alloys was evaluated and analyzed to detect
the difference in the electrochemical migration behavior between these solders by their electrochemical properties. Pb and
Bi additions to a Sn-base solder improved the resistance to electrochemical migration because of enhanced polarization properties.
The resistance was closely related to the cathodic deposition efficiency and the anodic dissolution behavior. In addition,
the composition of the dendrite formed by the electrochemical migration was related to the standard electrode potential of
the alloying element. 相似文献
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1.IntroductionOnecriticalaspectinelectronicpackagingisthefatigUe/creep--inducedfailureinsolder(tin--leadbasedalloy)interconnections.previouswork,[l--ZJhaveprovedthatthesolderjointreliabilitydependsonthesolderjointshape(amongotherparameters).Manyissueshavefocusedontheresearchaboutsolderjointshapesince90.However,asystematicmethodofpredictingandanalyzingsolderjointshapeandreliability,whichcanheusedindirectingpracticalengineering,isstillnotgiven.Basedontheobject--orientedaPPmach,anintendedsystem… 相似文献
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张亮 《稀有金属材料与工程》2016,45(11):2823-2826
Anand constitutive model of SnAgCuFe solder joints was studied, and the nine parameters was determined based on tensile testing. And the model was incorporated in finite element code for analyze the stress-strain response of SnAgCuFe solder joints in WLCSP30 device. The results indicate that the maximum stress concentrates on the top surface of corner solder joints, and the stress-strain of SnAgCuFe solder joints is lower than that of SnAgCu solder joints. Based on the fatigue life model, the addition of Fe can enhance the fatigue life of SnAgCu solder joints, therefore, the SnAgCuFe solders can replace the traditional SnPb to be used in electronic packaging. 相似文献
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电子封装微互连焊点力学行为的尺寸效应 总被引:10,自引:0,他引:10
研究了微互连模拟焊点在不同直径(d=200-575μm)和长度(l=75-525 μm)匹配条件下准静态微拉伸的力学行为.研究结果表明,焊点几何尺度因子d/l对焊点内的力学拘束及接头强度有重要影响;d/l增大时导致焊点中力学拘束和应力三轴度的提高,但接头强度并不完全符合Orowan近似公式的预测结果,保持l恒定而增加d时会出现强度变小的尺寸效应.研究结果还表明,无论无铅还是含铅钎料,其焊点拉伸强度与焊点体积(d2l)之间的变化关系符合反比例函数,即σF-Joint=1/Ad2l+B,焊点的强度随焊点体积的减小而显著增大,显示了焊点"越小越强"的"体积"尺寸效应. 相似文献
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1lNTR0DUCTIONInmaterialsscienceandengineering,manyphenomenaandpropertiesdepend0ntheshapeofinterfacesandsurfaces,stabilityandassociat-edpotentials.Inthefields0felectronicpackag-ingandsurfacemounttechnology,thehighden-sityandhighreliabilityarethecurrentneedsandthefuturetrends.Thereliabilityandthemanu-facturingprocessoftin-lead(SnPb)basedso1derjointaretheessentialproblemsofelectronicpackagingindustry.Previous....ar.h..[1'2]haveprovedthatthesolderjointgeometryplaysanimportantroleinsolderjoint… 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