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| 1 | MECHANICAL PROPERTIES OF FINE PITCH DEVICES SOLDERED JOINTS BASED ON CREEP MODEL显示文摘Nonlinear analyses of quad flat package (QFP) on printed circuit board (PCB) assemblies subjected to thermal cycling conditions are presented.Two different solders are considered,namely, Sn37Pb and Sn3.5Ag.The stress and strain response of fine pitch devices soldered joints was investigated by using finite element method based on Garofalo-Arrheninus model.The simulated results indicate creep distribution of soldered joints is not uniform,the heel and toe of soldered joints, the area between soldered joints and leads are the creep concentrated sites.The similar phenomena of stress curves simulated based on Garofalo-Arrhenlnus model and Anand equations is confirmed,and the creep strain value of Sn3.5Ag soldered joints is lower than that of Sn37Pb soldered joints. Thermal cycling results show that Sn3.5Ag strongly outperforms Sn37Pb for QFP devices under the studied test condition.This is well matched with the experimental outcome analyzed.In addition,the soldered devices were tested by micro-joints tester,the tensile strength of Sn3.5Ag soldered joints is found to be higher than that of Sn37Pb soldered joints.By analyzing the fracture microstructure of soldered joints,it is found that fracture mechanism of Sn3.5Ag soldered joints is toughness fracture, while fracture mechanism of Sn37Pb soldered joints includes brittle fracture and toughness fracture. The results of this study provide an important basis of understanding the mechanical properties of fine pitch devices with traditional Sn37Pb and Sn3.5Ag lead-free soldered joints. | ZHANG Liang XUE Songbai HAN Zongjie WANG Jianxin GAO Lili SHENG Zhong | 2008 | Chinese Journal of Mechanical Engineering2008，21，6： | 12 |
| 2 | EFFECTS OF LEAD WIDTHS AND PITCHES ON RELIABILITY OF QUAD FLAT PACKAGE(QFP)SOLDERED JOINTS显示文摘有限元素方法(女性) 被用来在焊接关节的可靠性上分析铅宽度和程度的效果。为 QFP 设备的最佳模拟也被研究。结果显示当铅程度是一样时,焊接关节的最大的相等的压力与增加铅宽度增加,当焊接关节的可靠性减少时。当铅宽度是一样时,焊接关节的最大的相等的压力不与增加铅程度完全减少,最大的相等的压力价值的最小的价值在所有曲线存在。在这个条件下面,焊接关节的最大的相等的压力是相对最不,焊接关节的可靠性高,集会是优秀的。模仿的结果显示最好的参数:铅宽度是 0.2 公里,铅沥青是 0.3 公里(在二领先之间的距离是 0.1 公里) ,它现在为 QFP 设备的 micromation 被有益于。当铅宽度是 0.25 公里,铅沥青是 0.35 公里时,焊接关节的最大的相等的压力的最小的值存在(在二领先之间的距离是 0.1 公里) ,设备能很长时间服务,可靠性最高,汇编是优秀的。模仿的结果也显示铅宽度是 0.15 公里和铅沥青的事实也许是 0.2 公里 QFP 的限制,它为高级的铅计数和汇编的 micromation 是重要的。 | XUE Songbai WU Yuxiu HAN Zongjie WANG Jianxin | 2007 | Chinese Journal of Mechanical Engineering2007，20，4： | 7 |
| 3 | Diode Laser Soldering Technology of Fine Pitch QFP Devices显示文摘The laser provides a controllable means of supplying localized energy for solder joint formation and is a valuable tool in electronics manufacture.Diode laser soldering for fine pitch QFP devices were carried out with Sn-Ag-Cu lead-free solder and Sn-Pb solder respectively,and the mechanical properties of micro-joints of the QFP devices were tested and studied by STR-1000 micro-joints tester.The results indicate that sound QFP micro-joints without bridging or solder ball are gained by means of diode laser soldering method with appropriate laser processing parameters,and the pitch of the QFP devices is as fine as to 0.4mm.Tensile strength of QFP micro-joints increases gradually with the increase of laser output power,the maximum tensile strength presents when the laser output power increase to a certain value.The results also indicate that the mechanical properties of QFP micro-joints soldered by diode laser soldering system are better than those of QFP micro-joints soldered by IR reflow soldering method.The experimental results may provide a theory guide for investigation of diode laser soldering. | XUE Songbai ZHANG Liang HAN Zongjie WANG Jianxin YU Shenglin | 2011 | Chinese Journal of Mechanical Engineering2011，24，5： | 5 |
| 4 | Effects of rare earth Ce on microstructures,solderability of Sn-Ag-Cu and Sn-Cu-Ni solders as well as mechanical properties of soldered joints显示文摘 | Wang Jianxin Xue Songbai Han Zongjie | | 0，，1： | 1 |
| 5 | A Paleoproterozoic(Orosirian) Ophiolitic Mélange, North Yangzte Craton显示文摘Ophiolites represent fragments of ancient oceanic lithosphere,tectonically incorporated into continental margins during plate subduction or remained in the subduction–collisional orogenic belt.They | HAN Qingsen PENG Songbai Ali POLAT Timothy KUSKY | 2016 | Acta Geologica Sinica(English Edition)2016，90，S1： | 1 |
| 6 | Effects of micro-amount of cerium on microstructures of SnAgCu solder and soldered joint显示文摘 | Han Zongjie Xue Songbai Liu Lin | 2006 | Journal of Rare Earths2006，，： | 1 |
| 7 | Design of the testing set-up for a nuclear fuel rod by neutron radiography at CARR显示文摘 | WEI Guohai HAN Songbai WANG Hongli | 2013 | Phys- ics Procedia2013，43，： | 1 |
| 8 | Effects of fluorination on crystal structure and electrochemical performance of antiperovskite solid electrolytes显示文摘The development of all-solid-state lithium batteries(ASSLBs)depends on exploiting solid-state electrolytes(SSEs)with high ionic conductivity and electrochemical stability.Fluorination is generally considered to be an effective strategy to improve the ionic conductivity and electrochemical stability of inorganic SSEs.Here,we report the partial fluorination of the chlo rine sites in an antiperovskite,by which the orthorhombic Li_(2)OHCl was transformed into cubic Li_(2)OHCl_(0.9)F_(0.1),resulting in a fourfold increase in ionic conductivity at 30℃.The ab initio molecular dynamics simulations suggest that both the crystal symmetry and the anions electronegativity influence the diffusion of Li+in the antiperovskite structure.Besides,from the perspective of experiments and calculations,it is confirmed that fluorination is a feasible method to improve the electrochemical stability of antiperovskite SSEs.The LiFePO_(4)|Li cell based on Li_(2)OHCl_(0.9)F_(0.1) is also assembled and exhibits stable cycle performance,which indicates that fluorination of antiperovskite SSEs is an effective way to produce high-performance SSEs for practical application of ASSLBs. | Lei Gao Manrong Song Ruo Zhao Songbai Han Jinlong Zhu Wei Xia Juncao Bian Liping Wang Song Gao Yonggang Wang Ruqiang Zou Yusheng Zhao | 2023 | Journal of Energy Chemistry2023，，2： | 0 |
| 9 | Application of neutron imaging in observing various states of matter inside lithium batteries显示文摘Lithium batteries have been essential technologies and become an integral part of our daily lives,powering a range of devices from phones to electric vehicles.To fully understand and optimize the performance of lithium batteries,it is necessary to investigate their internal states and processes through various characterization methods.Neutron imaging has been an indispensable complementary characterization technique to X-ray imaging or electron microscopy because of the unique interaction principle between neutrons and matter.It provides particular insights into the various states of matter inside lithium batteries,including the Li+concentration in solid electrodes,the Li plating/stripping behavior of Li-metal anodes,the Li+diffusion in solid ionic conductors,the distribution of liquid electrolytes and the generation of gases.This review aims to highlight the capabilities and advantages of neutron imaging in characterizing lithium batteries,as well as its current state of application in this field.Additionally,we discuss the potential of neutron imaging to contribute to the ongoing development of advanced batteries through its ability to visualize internal evolution. | Lei Gao Songbai Han Haijin Ni Jinlong Zhu Liping Wang Song Gao Yonggang Wang Dubin Huang Yusheng Zhao Ruqiang Zou | 2023 | National Science Review2023，10，11： | 0 |
| 10 | Recent Progress of Neutron Computed Tomography Device for Radioactive Sample at CARR显示文摘This neutron computed tomography(CT)system(nCT)will be used as a powerful nondestructive tool to study the radioactive samples,in particular the spent nuclear fuel element,which is able to comprehensively discern some defects inside the fuel elements,analyze the distribution and concentration of the inflammable components,detect the hydrogen concentration distribution and geometry change of zirconium alloy cladding,and also the welding state and welding tightness. | LI Zhengyao HE Linfeng WU Meimei HAN Songbai | 2018 | 中国原子能科学研究院年报2018，，1： | 0 |
| 11 | Analysis of Microstructure of Reactor Pressure Vessel Steel due to Thermal Aging Effect by Small-angle Neutron Scattering显示文摘Reactor pressure vessels are of great importance for nuclear power safety and play an extremely important role in the safe operation of reactors and in preventing nuclear leakage.As material microstructure probe,neutrons have the advantages of high penetrability,ability to distinguish between adjacent nuclide and sensitivity to magnetism.The small-angle neutron scattering can accurately obtain the size distribution,volume fraction and composition of the defects of the nanosized copper clusters in the pressure vessel steel matrix,revealing the microstructure mechanism of the macroscopic mechanical properties.The thermal aging supervision samples from a nuclear power plant in China had been analyzed by small-angle neutron scattering. | LI Bonan WANG Zijun LIU Rongdeng HAN Songbai SUN Kai CHEN Dongfeng LIU Yuntao WANG Chenglong TONG Zhenfeng LI Tianfu | 2018 | 中国原子能科学研究院年报2018，，1： | 0 |
| 12 | Discovery and Tectonic Significance of Paleoproterozoic Ophiolite from North Huangling Dome, Yangtze Craton显示文摘 | HAN Qingsen PENG Songbai CEN Yang JIANG Xingfu | 2015 | Acta Geologica Sinica(English Edition)2015，89，A02： | 0 |
| 13 | Solderability and intermetallic compounds formation of Sn-9Zn-xAg lead-free solders wetted on Cu substrate显示文摘The eutectic Sn-9Zn alloy was doped with Ag (0 wt.%-1 wt.%) to form Sn-9Zn-xAg lead-free solder alloys. The effect of the addition of Ag on the microstructure and solderability of this alloy was investigated and intermetallic compounds (IMCs) formed at the solder/Cu interface were also examined in this study. The results show that, due to the addition of Ag, the microstructure of the solder changes. When the quantity of Ag is lower than 0.3 wt.%, the needle-like Zn-rich phase decreases gradually. However, when the quantity of Ag is 0.5 wt.%-1 wt.%, Ag-Zn intermetallic compounds appear in the solder. In particular, adding 0.3 wt.% Ag improves the wetting behavior due to the better oxidation resistance of the Sn-9Zn solder. The addition of an excessive amount of Ag will deteriorate the wetting property because the glutinosity and fluidity of Sn-9Zn-(0.5, 1)Ag solder decrease. The results also indicate that the addition of Ag to the Sn-Zn solder leads to the precipitation of ε-AgZn3 from the liquid solder on preformed interfacial intermetallics (Cu5Zn8). The peripheral AgZn3, nodular on the Cu5Zn8 IMCs layer, is likely to be generated by a peritectic reaction L + γ-Ag5Zn8 →ε-AgZn3 and the following crystallization of AgZn3. | CHEN Wenxue XUE Songbai WANG Hui WANG Jianxin HAN Zongjie | 2009 | Rare Metals2009，28，6： | 0 |
| 14 | Development of New Thermal Neutron Scintillator Screen显示文摘Neutron scintillators have found widespread application in the detection of thermal neutrons especially in neutron radiography.Although composite neutron scintillators based on ZnS:Ag fluorescent materials have been in use for many decades,there are still some points pertaining to be optimized to improve the detection | HAN Songbai WANG Yu HE Linfeng WEI Guohai | 2017 | Annual Report of China Institute of Atomic Energy2017，，1： | 0 |
| 15 | A fiber-reinforced solid polymer electrolyte by in situ polymerization for stable lithium metal batteries显示文摘Solid polymer electrolytes(SPEs)by in situ polymerization are attractive due to their good interfacial contact with electrodes.Previously reported in situ polymerized SPEs,however,suffer from the low polymerization degree that causes poor mechanical strength,Li dendrite penetration,and performance decay in Li-metal batteries.Although highly polymerized SPEs are more stable than lowly polymerized ones,they are restricted by their sluggish long-chain mobility and poor ionic conductivity.In this work,a three-dimensional fibrous membrane with ion selectivity was prepared and used as a functional filler for the in situ formed SPE.The obtained SPE has high stability due to its high polymerization degree after the long-term heating process.The fibrous membrane plays a vital role in improving the SPE’s properties.The rich anion-adsorption sites on the fibrous membrane can alleviate the polarization effect and benefit a uniform current distribution at the interface.The fibrous nanostructure can efficiently interact with the polymeric matrix,providing rich hopping sites for fast Li+migration.Consequently,the obtained SPE enables a uniform Li deposition and long-term cycling performance in Li-metal batteries.This work reported an in situ formed SPE with both high polymerization degree and ionic conductivity,paving the way for designing high-performance SPEs with good comprehensive properties. | Yifan Xu Ruo Zhao Lei Gao Tingsong Gao Wenjuan Wang Juncao Bian Songbai Han Jinlong Zhu Qiang Xu Yusheng Zhao | 2023 | Nano Research2023，16，7： | 0 |
| 16 | Set-up for Indirect Neutron Computerized Tomography Applied to Spent Pressurized Water Reactor(PWR)Nuclear Fuel Rod显示文摘Spent PWR nuclear fuel rods have high radioactivity,normal NDT method can’t get meaning detecting data.With indirect neutron imaging method,the detecting of spent fuel rods can be achieved.With traditional indirect neutron imaging method,two dimensions neutron images can be got.In order to get three dimensions data,the CT reconstruction technique is necessary. | WEI Guohai HAN Songbai WU Meimei HE Linfeng WANG Yu WANG Hongli LIU Yuntao SUN Kai CHEN Dongfeng | 2017 | Annual Report of China Institute of Atomic Energy2017，，1： | 0 |
| 17 | Research Progress of Neutron Computed Tomography for Radioactive Samples in CARR显示文摘1 Overview1.1 Introduction of radioactive nuclear fuel bar Experiment device of computed tomography used for radioactive samples is one part of neutron radiography facility,which located at the guide hall in China Advanced Research Reactor. | LI Zhengyao HE Linfeng WEI Guohai HAN Songbai | 2017 | Annual Report of China Institute of Atomic Energy2017，，1： | 0 |
| 18 | Formation of the structure-Ⅱgas hydrate from low-concentration propane mixed with methane显示文摘It has been recognized that a small amount of propane mixed with methane can change greatly in not only the thermodynamics but also the structural properties of gas hydrate.However,its mechanism is still not well understood yet.In this research,structure-Ⅱ(sⅡ)hydrate is synthesized using a methanepropane gas mixture with an initial mole ratio of 99:1,and it is found that large(5~(12)6~4)cages are cooccupied by multiple gases based on the rigid structure analysis of neutron diffraction data.The first principles calculation and molecular dynamics simulation are conducted to uncover the molecular mechanism for sⅡmethane-propane hydrate formation,revealing that the presence of propane inhibits the formation of structure-Ⅰ(sⅠ)hydrate but promotes sⅡhydrate formation.The results help to understand the accumulation mechanism of natural gas hydrate and benefit to optimize the condition for gas storage and transportation in hydrate form. | Sanya Du Xiaomin Han Wenjiu Cai Jinlong Zhu Xiaobai Ma Songbai Han Dongfeng Chen Yusheng Zhao Hui Li Hailong Lu Xiaohui Yu | 2023 | Chinese Journal of Chemical Engineering2023，58，6： | 0 |
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