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1.
The interfacial reaction between liquid In-49Sn solders and Ag substrates results in the formation of a thicker Ag2In intermetallic compound accompanied with the development of a thin AgIn2 layer. Through further aging of the In-49Sn/Ag soldered specimens at various temperatures ranging from room to 100°C, solid/solid
trnasitions between Ag2In and AgIn2 intermetallic compounds can be observed. When the temperature drops below 75°C, Ag2In will react with the In-49Sn solder to form the dominant AgIn2 phase. Conversely, AgIn2 is consumed at a higher temperature (e.g., 100°C) when reacting with the Ag substrate to create a now dominant Ag2In phase. Lastly, the different mechanical, electrical, magnetic, and corrosion behaviors of both intermetallic compounds
are respectively made known through direct measurements of the material properties of the individual Ag2In and AgIn2 bulk samples. 相似文献
2.
The morphology and growth kinetics of intermetallic compounds formed during the reaction of liquid In 10Ag on Ag substrates
in the temperature range between 250°C and 375°C are studied. The results indicate that the Ag2In intermetallic compounds that appear at the interface are in the columnar shape, enveloped by thin AgIn2 shells. The growth kinetics of intermetallic compounds are parabolic, indicating that the reaction is diffusion-controlled.
The Arrhenius reaction activation energy was found to be 44.9 kJ/mol. Also, the wetting behavior of the In10Ag on Ag substrates
was studied. The results show that there exists a transient plateau of the contact angle variation. Such a phenomenon can
be explained by the intermetallic compound precursor halo formation preceding the edge of the solder drop. 相似文献
3.
通过实验测定Sn—Ag—Sb及Sn—Zn—In系列合金的润湿角,进行了润湿性研究,发现Sn—Ag—Sb及Sn—Zn—In系焊料存在润湿性差的缺点,通过添加低表面张力的金属或稀土元素可在一定程度上降低润湿角,能提高润湿性。 相似文献
4.
The intermetallic compounds formed in Sn3Ag0.5Cu and Sn3Ag0.5Cu0.06Ni0.01Ge solder BGA packages with Ag/Cu pads are investigated.
After reflow, scallop-shaped η-Cu6Sn5 and continuous planar η-(cu0.9Ni0.1)6Sn5 intermetallics appear at the interfaces of the Sn3Ag0.5Cu and Sn3Ag0.5Cu0.06Ni0.01Ge solder joints, respectively. In the
case of the Sn3Ag0.5Cu specimens, an additional ε-Cu3Sn intermetallic layer is formed at the interface between the η-Cu6Sn5 and Cu pads after aging at 150°C, while the same type of intermetallic formation is inhibited in the Sn3Ag0.5Cu0.06Ni0.01Ge
packages. In addition, the coarsening of Ag3Sn precipitates also abates in the solder matrix of the Sn3Ag0.5Cu0.06Ni0.01Ge packages, which results in a slightly higher
ball shear strength for the specimens. 相似文献
5.
The intermetallic compounds (IMCs) formed during the reflow and aging of Sn3Ag0.5Cu and Sn3Ag0.5Cu0.06Ni0.01Ge solder BGA
packages with Au/Ni surface finishes were investigated. After reflow, the thickness of (Cu, Ni, Au)6Sn5 interfacial IMCs in Sn3Ag0.5Cu0.06Ni0.01Ge was similar to that in the Sn3Ag0.5Cu specimen. The interiors of the solder balls
in both packages contained Ag3Sn precipitates and brick-shaped AuSn4 IMCs. After aging at 150°C, the growth thickness of the interfacial (Ni, Cu, Au)3Sn4 intermetallic layers and the consumption of the Ni surface-finished layer on Cu the pads in Sn3Ag0.5Cu0.06Ni0.01Ge solder
joints were both slightly less than those in Sn3Ag0.5Cu. In addition, a coarsening phenomenon for AuSn4 IMCs could be observed in the solder matrix of Sn3Ag0.5Cu, yet this phenomenon did not occur in the case of Sn3Ag0.5Cu0.06Ni0.01Ge.
Ball shear tests revealed that the reflowed Sn3Ag0.5Cu0.06Ni0.01Ge packages possessed bonding strengths similar to those of
the Sn3Ag0.5Cu. However, aging treatment caused the ball shear strength in the Sn3Ag0.5Cu packages to degrade more than that
in the Sn3Ag0.5Cu0.06Ni0.01Ge packages. 相似文献
6.
Li-ling Yan Cheng-kuo Lee Da-quan Yu Ai-bin Yu Won-Kyoung Choi John-H Lau Seung-Uk Yoon 《Journal of Electronic Materials》2009,38(1):200-207
A bonding joint between Cu metallization and evaporated In/Sn composite solder is produced at a temperature lower than 200°C
in air. The effects of bonding temperature and duration on the interfacial bonding strength are studied herein. Cross sections
of bonding joints processed at different bonding conditions were examined by scanning electron microscopy (SEM). The optimal
condition, i.e., bonding temperature of 180°C for 20 min, was chosen because it gave rise to the highest average bonding strength
of 6.5 MPa, and a uniform bonding interface with minimum voids or cracks. Good bond formation was also evidenced by scanning
acoustic imaging. For bonding couples of patterned dies, a helium leak rate of 5.8 × 10−9 atm cc/s was measured, indicating a hermetic seal. The interfacial reaction between Cu and In/Sn was also studied. Intermetallic
compounds (IMCs) such as AuIn2, Cu6Sn5, and Cu11In9 were detected by means of x-ray diffraction analysis (XRD), and transmission electron microscopy (TEM) accompanied by energy-dispersive
x-ray (EDX) spectroscopy. Chemical composition analysis also revealed that solder interlayers, Sn, and In were completely
converted into IMCs by reaction with Cu. All the IMCs formed in the joints have remelting temperatures above 300°C according
to the Cu-In, Cu-Sn, and Au-In phase diagrams. Therefore, the joint is able to sustain high service temperatures due to the
presence of these IMCs. 相似文献
7.
For the application of In-49Sn solder in bonding recycled-sputtering targets to Cu back plates, the intermetallic compounds
formed at the In-49Sn/Cu interface are investigated. Scanning electron microscopy (SEM) observations show that the interfacial
intermetallics consist of a planar layer preceded by an elongated scalloped structure. Electron-probe microanalyzer analyses
indicate that the chemical compositions of the planar layer and the scalloped structure are Cu74.8In12.2Sn13.0 and Cu56.2In20.1Sn23.7, respectively, which correspond to the ε-Cu3(In,Sn) and η-Cu6(In,Sn)5 phases. Kinetics analyses show that the growth of both intermetallic compounds is diffusion controlled. The activation energies
for the growth of η- and ε-intermetallics are calculated to be 28.9 kJ/mol and 186.1 kJ/mol. Furthermore, the formation mechanism of intermetallic compounds
during the In-49Sn/Cu soldering reaction is clarified by marking the original interface with a Ta-thin film. Wetting tests
are also performed, which reveal that the contact angles of liquid In-49Sn drops on Cu substrates decline to an equilibrium
value of 25°C. 相似文献
8.
Thin film of silver tin sulfides (Ag–Sn–S) has been deposited on indium tin oxide coated glass (ITO) substrates using potentiostatic cathodic electrodeposition technique. New procedure for the growth of Ag–Sn–S film is presented. An electrolyte solution containing Silver Nitrate (AgNO3), Tin(II) Chloride (SnCl2) and Sodium Thiosulfate (Na2S2O3)in acidic solution (pH ~2) and at temperature of the bath 55 °C were used for the growth of Ag–Sn–S thin film. Prior to the deposition, a cyclic voltammetry technique was performed in binary (Ag–S, Sn–S) and ternary (Ag–Sn–S) systems. This study was carried out to examine the behavior of electroactive species at the electrode surface. Based on these results, the cathodic applied potential was fixed at −1000 mV versus Ag/AgCl to obtain a uniform and good adhesion of ternary thin film. After that, structural, morphological and optical performances of films have been investigated. The X-ray diffraction patterns of the samples demonstrate the presence of the orthorhombic phase of Ag8SnS6 at applied potential of −1000 mV versus Ag/AgCl. Based on the scanning electron microscopy (SEM), it was found that the surface morphology and grain size were strongly influenced by the presence of Sn and/or Ag in the electrolyte bath. The band gaps of binaries and ternary compound are evaluated from optical absorption measurements. Band gap of Ag8SnS6 determined from transmittance spectra is in the range 1.56 eV. Flat-band potential and free carrier concentration have been determined from Mott–Schottky plot and are estimated to be around 0.18 V and 2.21×1014 cm−3 respectively. The photoelectrochemical test of Ag8SnS6 was studied and the experimental observations are discussed in detail. 相似文献
9.
The effect of electric current on the Sn/Ag interfacial reaction was studied at 140°C and 200°C, by examining the growth of
phase (ε-Ag3Sn) in the Sn/Ag reaction couples with a constant current density. Only at 140°C was the growth of phase affected by the passage
of electric current. The growth rate was enhanced when diffusion of Sn and electron flow were in the same direction, and retarded
when they were in the opposite direction. It was found that the diffusion coefficient of Sn through Ag3Sn was 3.37 μm2/h and the apparent effective charge for Sn in Ag3Sn was −90, at 140°C. 相似文献
10.
利用扫描电子显微镜(SEM)和透射电子显微镜(TEM)研究了Sn3.8Ag0.7Cu(Sn37Pb)/Cu焊点在时效过程中的界面金属间化合物(IMC)形貌和成份。结果表明:150℃高温时效50、100、200、500h后,Sn3.8Ag0.7Cu(Sn37Pb)/Cu焊点界面IMC尺寸和厚度增加明显,IMC颗粒间的沟槽越来越小。50h时效后界面出现双层IMC结构,靠近焊料的上层为Cu6Sn5,邻近基板的下层为Cu3Sn。之后利用透射电镜观察了Sn37Pb/Ni和Sn3.8Ag0.7Cu/Ni样品焊点界面,结果显示,焊点界面清晰,IMC晶粒明显。 相似文献
11.
Sun-Kyoung Seo Moon Gi Cho Hyuck Mo Lee Won Kyoung Choi 《Journal of Electronic Materials》2006,35(11):1975-1981
We chose Sn−2.8Ag−20In and Sn−10Bi−10In (numbers are in weight percentages unless specified otherwise) as Pb-free solder materials
for intermediate-step soldering. We then investigated how the two solders reacted with the under bump metallurgy (UBM) of
Au/Ni (Au: 1.5 μm and Ni: 3 μm) at 210°C, 220°C, 230°C, and 240°C for up to 4 min. All, of the Au UBM was dissolved into the
solder matrix as soon as the interfacial reaction started. The reaction formed Au(In, Sn)2 in the case of SnAgIn, and it formed Au(Sn, In)4 and Au(In, Sn)2 in the case of SnBiIn. The formation mechanism of the intermetallic phases is explained thermodynamically. The exposed Ni
layer reacted with the solder and formed Ni28Sn55In17 in case of SnAgIn, and formed Ni3(Sn, In)4 in case of SnBiIn, at the solder joint interface. Under the same soldering conditions, the Ni3(Sn,In)4 layer in the SnBiIn/UBM is thicker than the Ni28Sn55In17 layer in the SnAgIn/UBM. Because of the thicker intermetallic compound layer, the SnBiIn solder joint has weaker shear strength
than the SnAgIn solder joint. 相似文献
12.
T. H. Chuang S. Y. Chang L. C. Tsao W. P. Weng H. M. Wu 《Journal of Electronic Materials》2003,32(3):195-200
The intermetallic compounds formed at the interfaces between In-49Sn solder balls and Au/Ni/Cu pads during the reflow of In-49Sn
solder, ball-grid array (BGA) packages are investigated. Various temperature profiles with peak temperatures ranging from
140°C to 220°C and melting times ranging from 45 sec to 170 sec are plotted for the reflow processes. At peak temperatures
below 170°C, a continuous double layer of intermetallics can be observed, showing a composition of Au(In,Ni)2/Au(In,Ni). Through selective etching of the In-49Sn solders, the intermetallic layer is made up of irregular coarse grains.
In contrast, a number of cubic-shaped AuIn2 intermetallic compounds appear at the interfaces and migrate toward the upper domes of In-49Sn solder balls after reflow
at peak temperatures above 200°C for longer melting times. The upward floating of the AuIn2 cubes can be explained by a thermomigration effect caused by the temperature gradient present in the liquid solder ball.
The intermetallic compounds formed under various reflow conditions in this study exhibit different types of morphology, yet
the ball shear strengths of the solder joints in the In-49Sn BGA packages remain unaffected. 相似文献
13.
T. H. Chuang H. M. Wu M. D. Cheng S. Y. Chang S. F. Yen 《Journal of Electronic Materials》2004,33(1):22-27
Intermetallic compounds formed during the soldering reactions between Sn-3.5Ag and Cu at temperatures ranging from 250°C to
375°C are investigated. The results indicate that scallop-shaped η-Cu6(Sn0.933 Ag0.007)5 intermetallics grow from the Sn-3.5Ag/Cu interface toward the solder matrix accompanied by Cu dissolution. Following prolonged
or higher temperature reactions, ɛ-Cu3 (Sn0.996 Ag0.004) intermetallic layers appear behind the Cu6(Sn0.933 Ag0.007)5 scallops. The growth of these interfacial intermetallics is governed by a kinetic relation: ΔX=tn, where the n values for η and ɛ intermetallics are 0.75 and 0.96, respectively. The mechanisms for such nonparabolic growth
of interfacial intermetallics during the liquid/solid reactions between Sn-3.5Ag solders and Cu substrates are probed. 相似文献
14.
15.
For development of a lead-free composite solder for advance electrical components, lead-free Sn3.5Ag0.5Cu solder was produced by mechanically mixing 0.5 wt.% TiO2 nanopowder with Sn3.5Ag0.5Cu solder. The morphology and growth kinetics of the intermetallic compounds that formed during the soldering reactions between Sn3.5Ag0.5Cu solder with intermixed TiO2 nanopowder and Cu substrates at various temperatures ranging from 250 to 325 °C were investigated. A scanning electron microscope (SEM) was used to quantify the interfacial microstructure at each processing condition. The thickness of interfacial intermetallic layers was quantitatively evaluated from SEM micrographs using imaging software. Experimental results show that a discontinuous layer of scallop-shaped Cu-Sn intermetallic compounds formed during the soldering. Kinetics analysis shows that the growth of such interfacial Cu-Sn intermetallic compounds is diffusion controlled with an activation energy of 67.72 kJ/mol. 相似文献
16.
A joint between Sn95.5Ag4Cu0.5 (mass%) solder and an Ag/Pd thick film was soldered by dipping at 260°C for 3–30 sec. Shrinkage
voids and Sn grain growth were characterized as well as their transformation kinetics. Void shrinkage occurred in the zone
near the top surface of the joint. Shrinkage was always accompanied by colonies of ternary/quaternary meta-eutectic that were
the regions solidified last in the joint. The Sn grains accumulated into two bands across the joint during solidification:
one was transverse through the thickness and the other was parallel to the solder pad. 相似文献
17.
During the reflow process of Sn-3.5Ag solder ball grid array (BGA) packages with Ag/Cu and Au/Ni/Cu pads, Ag and Au thin films
dissolve rapidly into the liquid solder, and the Cu and Ni layers react with the Sn-3.5Ag solder to form Cu6Sn5 and Ni3Sn4 intermetallic compounds at the solder/pad interfaces, respectively. The Cu6Sn5 intermetallic compounds also appear as clusters in the solder matrix of Ag surface-finished packages accompanied by Ag3Sn dispersions. In the solder matrix of Au/Ni surface-finished specimens, Ag3Sn and AuSn4 intermetallics can be observed, and their coarsening coincides progressively with the aging process. The interfacial Cu6Sn5 and Ni3Sn4 intermetallic layers grow by a diffusion-controlled mechanism after aging at 100 and 150°C. Ball shear strengths of the reflowed
Sn-3.5Ag packages with both surface finishes are similar, displaying the same degradation tendencies as a result of the aging
effect. 相似文献
18.
Yu-Chih Liu Wei-Hong Lin Hsiu-Jen Lin Tung-Han Chuang 《Journal of Electronic Materials》2006,35(1):147-153
During the reflow process of Sn-8Zn-20In solder joints in the ball grid array (BGA) packages with Au/Ni/Cu and Ag/Cu pads,
the Au and Ag thin films react with liquid solder to form γ3-AuZn4/γ-Au7Zn18 and ε-AgZn6 intermetallics, respectively. The γ3/γ intermetallic layer is prone to floating away from the solder/Ni interface, and the appearance of any interfacial intermetallics
cannot be observed in the Au/Ni surface finished Sn-8Zn-20In packages during further aging treatments at 75°C and 115°C. In
contrast, ε-CuZn5/γ-Cu5Zn8 intermetallics are formed at the aged Sn-8Zn-20In/Cu interface of the immersion Ag BGA packages. Bonding strengths of 3.8N
and 4.0N are found in the reflowed Sn-8Zn-20In solder joints with Au/Ni/Cu and Ag/Cu pads, respectively. Aging at 75°C and
115°C gives slight increases of ball shear strength for both cases. 相似文献
19.
《Microelectronics Reliability》2014,54(11):2513-2522
Appropriate constitutive, damage accumulation and fracture models are critical to accurate life predictions. In this study, we utilize the maximum entropy fracture model (MEFM) to predict and validate cyclic hysteresis in Sn3.8Ag0.7Cu and Sn3.0Ag0.5 solder alloys through a damage enhanced Anand viscoplasticity model. MEFM is a single-parameter, information theory inspired model that aims to provide the best estimate for accumulated damage at a material point in ductile solids in the absence of detailed microstructural information. Using the developed model, we predict the load drop during cyclic fatigue testing of the two chosen alloys. A custom-built microscale mechanical tester was utilized to carryout isothermal cyclic fatigue tests on specially designed assemblies. The resultant relationship between load drop and accumulated inelastic dissipation was used to extract the geometry and temperature-independent damage accumulation parameter of the maximum entropy fracture model for each alloy. The damage accumulation relationship is input into the Anand viscoplastic constitutive model, allowing prediction of the stress–strain hysteresis and cyclic load drop. The damage accumulation model is validated by comparing predicted and measured load drops after 55 and 85 cycles respectively for Sn3.8Ag0.7Cu and Sn3.0Ag0.5 solder alloys. The predictions agreed to within 10% and 20% of the experimental observations respectively for the two alloys. The damage enhanced Anand model developed in this study will enable the tracking of crack fronts during finite element simulations of fatigue crack initiation and propagation in complex solder joint geometries. 相似文献
20.
It is essential to suppress agglomeration of Ag films caused by thermal treatment for their successful application as new metallization materials. Co-sputtered Ag(Al) and Ag(Au) films were investigated, with regard to their change in morphology and electrical resistivity after vacuum annealing. As a result, agglomeration of the Ag(Al) film (Al: 4.3 at.%) was not recognized even after annealing at 600 °C. However, void formation followed by de-wetting was observed for the Ag(Au) film after annealing, similar to that for a pure Ag film. The morphological change was accompanied by an increase in the resistivity of the Ag(Au) films with annealing temperature. On the other hand, the resistivity of the Ag(Al) films did not increase by annealing at temperatures from 400 to 600 °C. However, the film with the highest Al content, which was most resistive to agglomeration, had too high resistivity for use as a metallization material. By analysis of the Auger depth profile, the presence of very thin oxide layers at the surface of the film and at the interface with the substrate was confirmed for Ag(Al) films after annealing. This was considered to be the reason for the large difference in agglomeration behavior between the Ag(Au) and Ag(Al) films. 相似文献