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1.
Ohnuma I. Miyashita M. Xing Jun Liu Ohtani H. Ishida K. 《Electronics Packaging Manufacturing, IEEE Transactions on》2003,26(1):84-89
We have recently developed a thermodynamic database for micro-soldering alloys, alloy database for micro-solders (ADAMIS). ADAMIS which consists of the elements Ag, Bi, Cu, In, Pb, Sb, Sn, and Zn has been constructed by the calculation of phase diagrams (CALPHAD) method. The thermodynamic parameters for describing the Gibbs energy of the liquid and solid phases have been evaluated by optimizing the experimental data on phase boundaries and thermo-chemical properties. In this paper, the phase equilibria and the related thermodynamic properties pertaining to the Sn-Ag-X (X=Bi, In, Cu, and Zn) alloys are examined using ADAMIS. Typical examples of the isothermal and vertical section phase diagrams, liquidus surface, etc. for these promising lead-free solders are presented. In addition, ADAMIS is also applied to calculate the nonequilibrium solidification process using the Scheil model. 相似文献
2.
A thermodynamic database for the calculation of phase diagrams in micro-soldering alloy systems, which include the elements
Pb, Bi, Sn, Sb, Cu, Ag, and Zn has been developed using the CALPHAD method. The various thermodynamic parameters for describing
the Gibbs energies of the different constituent phases have been evaluated by optimizing experimental data on phase boundary
compositions and thermochemical properties such as activity, heat of mixing and enthalpy of formation. The resulting database
provides the means whereby the liquidus and solidus surfaces, isothermal and vertical section diagrams, phase percentages
and the mole fraction of the phase constitutions etc., in multi-component soldering alloys can be readily calculated. Related
information such as the surface tension and viscosity of the liquid phase can also be predicted, thus rendering the database
as a valuable tool for developing leadbearing and lead-free solders. 相似文献
3.
X. J. Liu I. Ohnuma C. P. Wang M. Jiang R. Kainuma K. Ishida M. Ode T. Koyama H. Onodera T. Suzuki 《Journal of Electronic Materials》2003,32(11):1265-1272
Recent progress on the thermodynamic databases of calculated phase diagrams in microsolders and Cu-based alloys is presented.
A thermodynamic tool, Alloy Database for Microsolders (ADAMIS), is based on comprehensive experimental and thermodynamic data
accumulated with the calculation of phase diagrams (CALPHAD) method and contains eight elements, namely, Ag, Bi, Cu, In, Sb,
Sn, Zn, and Pb. It can handle all combinations of these elements and all composition ranges. The elements of Al and Au have
also been added to ADAMIS within a limited range of compositions. Furthermore, a database of Cu-based alloys, including binary
(Cu-X), ternary (Cu-Fe-X, Cu-Ni-X, and Cu-Cr-X), and multicomponent (Cu-Ni-Cr-Sn-Zn-Fe-Si) systems, has also been developed.
Typical examples of the calculation and application of these data-bases are presented. These databases are expected to be
a powerful tool for the development of Pb-free solders and Cu substrate materials as well as for promoting the understanding
of the interfacial phenomena between them in electronic packaging technology. 相似文献
4.
Jir̆í Sopoušek Marián Palcut Erika Hodúlová Jozef Janovec 《Journal of Electronic Materials》2010,39(3):312-317
The tin-based alloy Sn-1.5Ag-0.7Cu-9.5In (composition in wt.%) is a potential candidate for lead-free soldering at temperatures
close to 200°C due to the significant amount of indium. Samples of Sn-1.5Ag-0.7Cu-9.5In were prepared by controlled melting
of the pure elements, followed by quenching to room temperature. The samples were analyzed by scanning electron microscopy/energy-dispersive
x-ray spectroscopy (SEM/EDS) and electron backscatter diffraction. The solidified melt consisted of four different phases.
Solidification behavior was monitored by heat-flux differential scanning calorimetry (DSC). The phase equilibrium has been
further investigated by thermodynamic calculations. The observed phase compositions as well as DSC signals are reasonably
explained using the calculation of phase diagrams (CALPHAD) approach. 相似文献
5.
The selection and evaluation of Pb-free solders requires information that is best determined through a knowledge of ternary
and higher order phase diagrams. As part of an ongoing program on Pb-free solder phase diagrams at the National Institute
of Standards and Technology, a thermodynamic model is formulated for the Sn-Bi-Ag phase diagram. Thermodynamic functions for
the various phases obtained by fitting measured data for the three constituent binary systems are extrapolated to the ternary
system using the method of Muggianu. Modeling results are compared to preliminary experimental data for the ternary system
and are applied in the calculation of the solidification path. 相似文献
6.
The phase transformations of the Sn-Ag-Ni system were investigated by means of differential scanning calorimetry (DSC). Based
on the experimental data of phase equilibria and thermodynamic properties determined by the present work and previous literature,
the thermodynamic assessments of the Sn-Ag-Ni system were carried out using the calculation of phase diagrams (CALPHAD) method.
The thermodynamic parameters for describing the phase equilibria were optimized, and reasonable agreement between the calculations
and experimental data was obtained in the Sn-Ag-Ni ternary system. 相似文献
7.
A quasi sub-subregular solution model is used to describe the thermodynamic properties of the liquid phase in the In-Sb and
Ga-Sb systems. The In-Sb and Ga-Sb phase diagrams are, then, calculated from the optimized model parameters for the liquid
phases and the Gibbs energies of formation of the InSb and GaSb phases obtained from the literature. The calculated phase
diagrams and thermodynamic properties are in reasonable agreement with the experimental data. Our calculations are also compared
with those reported in the literature using associated solution models for the liquid phases.
On leave from Indian Institute of Technology, Kanpur, UP, 208016, India 相似文献
8.
Investigation of multi-component lead-free solders 总被引:5,自引:0,他引:5
Binary phase diagrams of interest for lead-free solder development have been entered into the THERMO-CALC data base. These
may be used directly to calculate multi-component phase relations vs temperature provided there are no ternary or higher order
interactions. Such occur in the Sn-Ag-Zn system and are being evaluated. Contact angles of a number of solder-flux combinations
on copper were directly measured in spreading tests. With a rosin-isopropyl alcohol flux, the contact angles of binary eutectic
solders were in degrees: Sn-Bi at 166°C, 40; Sn-Zn at 225°C, 60; Sn-Ag at 250°C, 45. These angles were little affected by
a number of 1% ternary additions to the solder. The contact angles were 20 degrees or less when SnCl2 was used as a flux. The SnCl2 reacts with Cu to form Cu3Sn. The most likely successful approach to obtain satisfactory wetting with lead-free solders appears to be development of
a satisfactory flux. 相似文献
9.
The thermodynamic behaviors of the Cd-Te, Pb-Te, Cd-Pb and Cd-Pb-Te systems are critically analyzed in this work by means
of the calculation of phase diagrams (CALPHAD) method. The liquid phases containing Te are described by the associated solution
model, which is capable of dealing with V-shaped curves of mixing enthalpies in solution phases, sharp maxima of liquidus
curves in phase diagrams, and abrupt changes in activity plots. The binary compounds, CdTe and PbTe, are considered to be
stoichiometric in the two binary systems, but they form a line compound described by (Cd,Pb)1(Te)1 in the ternary system. The fcc phase, in which only Cd and Pb elements are present, is treated with the substitutional solution
model. The experimental data available in the literature are extensively assessed, from which the thermodynamic parameters
necessary for each phase are obtained. Various calculated phase equilibria and thermodynamic properties are compared with
the experimental data. The excellent agreement indicates that this work contributes to the study of phase stabilities in the
Cd-Pb-Te system. 相似文献
10.
Thermodynamic prediction of interface phases at Cu/solder joints 总被引:1,自引:0,他引:1
A thermodynamic method to predict the intermetallic compound which forms first at the substrate/solder interface during the
soldering process has been suggested through calculations of metastable phase equilibria between the substrate and the liquid
solder and by comparison of the driving forces of formation of individual intermetallic compound phases. It has been applied
to the interfacial reaction between Cu substrate and Sn-Ag, Sn-Zn eutectic solders. The prediction from thermodynamic calculations
was in good agreement with observed experimental results. The solid-state growth behavior of compound phases formed at the
interface of Cu/Sn-Zn and Cu/Sn-Ag eutectic solder joints was explained and a schematic diffusion path suggested through calculated
ternary phase diagrams. 相似文献
11.
热力学计算在无铅钎料合金设计中的应用 总被引:4,自引:0,他引:4
依据CALPHAD方法进行相平衡计算过程中热力学模型的建立及其求解作了简要介绍,对热力学数据库的特征作了描述。对基于CALPHAD方法而开发的Thermo Calc系统的数据库及几个主要模块的功能作了概括的介绍。并针对在无铅钎料研究领域,利用ThermoCalc进行无铅钎料多元合金相平衡计算、预测液态钎料的表面张力和粘度以及钎料与基底之间形成的金属间化合物的驱动力的研究进展进行了总结。着重介绍了日本Tohoku大学材料系的研究人员开发的钎料合金热力学数据库。 相似文献
12.
13.
Phase equilibria of Sn-In based micro-soldering alloys 总被引:1,自引:0,他引:1
I. Ohnuma Y. Cui X. J. Liu Y. Inohana S. Ishihara H. Ohtani R. Kainuma K. Ishida 《Journal of Electronic Materials》2000,29(10):1113-1121
The phase equilibria of Sn-In-X (X=Ag, Bi, Sb, Zn), the most basic information necessary for the development of Pb-free micro-soldering
alloys, were studied using the CALPHAD method. Thermodynamic analyses for describing the Gibbs energies of the constituent phases were made by optimizing the obtained
data on the experimental phase diagrams, and such data in the literature, including data on thermochemical properties. The
present results combined with the thermodynamic database which was recently developed by our group [I. Ohnuma et al., J. Electron. Mater. 28, 1164 (1999)] provide various information on phase equilibria such as liquidus and solidus surfaces, isothermal and vertical
section diagrams, mole fractions of the phase constitutions, etc., and thermodynamic properties such as activity, heat of
mixing, surface energy, viscosity, etc., in multi-component soldering alloy systems including the elements of Pb, Bi, Sn,
Sb, Cu, Ag, Zn, and In. Typical examples for the phase diagrams and thermodynamic properties of Sn-In-X ternary systems are
shown. The application of the database to the alloy design for Pb-free solders is also presented. 相似文献
14.
Md. Arifur Rahman Chia-Wei Fan Shin-Ju Wang Cheng-En Ho Wojciech Gierlotka 《Journal of Electronic Materials》2014,43(1):176-186
Recently, Pd surface finishes over Cu substrates have been widely used in microelectronic packaging to prevent pad oxidation before soldering and to improve the bondability with Cu wires. The interfacial reactions between these newly developed Pd-based substrates and Pb-free solders, particularly Sn-based solders, are of practical importance. To completely understand interfacial reactions and phase transformation phenomena, phase equilibrium information on solders, intermetallics, and substrate materials are required. In this study, the phase equilibria of the Cu-Pd-Sn ternary system at 200°C was investigated by scanning electron microscopy, electron probe microanalysis, and electron backscatter diffraction. Particular emphasis was placed on the Sn-rich corner of the isothermal section. To analyze the experimental results, a thermodynamic assessment was performed using the computer coupling of phase diagrams and thermochemistry method. 相似文献
15.
从专利角度探讨Sn-Zn无铅焊料研究现状 总被引:1,自引:1,他引:0
无铅焊料的研发及专利权的保护是我国电子行业亟待解决的问题。文中结合中国专利权的特点,描述了世界各国在无铅焊料专利上的竞争以及Sn-Zn无铅焊料的专利申请状况,并据此分析了Sn- Zn无铅焊料的研发及应用状况、专利Sn-Zn无铅焊料的特点以及应用障碍,以期对我国自主知识产权的Sn-Zn无铅焊料的研发及无铅专利保护有所帮助。 相似文献
16.
由于传统焊接技术使用的Sn-Pb焊料中的铅会对环境造成污染而被禁止使用,近年来无铅焊料成为了研究热点。文中介绍了运用于电子产品中的无铅焊料的发展背景、特点及要求。根据应用温度不同,无铅焊料可以分为低温、中温和高温无铅焊料。文章综述了它们各自的应用特点、场合及存在的问题和发展前景。 相似文献
17.
I. Ohnuma M. Miyashita K. Anzai X. J. Liu H. Ohtani R. Kainuma K. Ishida 《Journal of Electronic Materials》2000,29(10):1137-1144
We have recently developed a thermodynamic database for micro-soldering alloys which consists of the elements Pb, Bi, Sn,
Sb, Cu, Ag, Zn, and In. In this paper, the phase equilibria and the related thermodynamic properties of the Sn-Ag-Cu base
alloys are presented using this database, alloy systems being one of the promising candidates for Pb-free solders. The isothermal
section diagrams of the Sn-Ag-Cu ternary system were experimentally determined by SEM-EDS, x-ray diffraction and metallographic
techniques. Based on the present results as well as the previous data on phase boundaries and thermochemical properties, thermodynamic
assessment of this system was carried out. The isothermal and vertical section diagrams, liquidus surface, mass fractions
of the phase constitution, etc., were calculated. The predictions of surface energy and viscosity were also investigated.
Moreover, a non-equilibrium solidification process using the Scheil model was simulated and compared with the equilibrium
solidification behavior in some Sn-Ag-Cu base alloys. Calculated results based on the Scheil model were incorporated into
a three-dimensional solidification simulation and the prediction of practical solidification procedures was performed. 相似文献
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