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Interaction Kinetics between Sn-Pb Solder Droplet and Au/Ni/Cu Pad

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Journal of Materials Science & Technology 2006年第3期22卷 392-396页

作者： Fuquan LI Chunqing WANG yanhong tian Microjoining Lab. School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

The interracial phenomena of the Sn-Pb solder droplet on and needle-like AuSn4 are formed at the interface after Au/Ni/Cu pad are investigated. A continuous AuSn2 the liquid state reaction （soldering）. The interracial reaction between the solder and Au layer continues during solid state aging with AuSn4 breaking off from the interface and felling into the solder. The kinetics of Au layer dissolution and diffusion into the solder during soldering and aging is analyzed to elucidate intermetallic formation mechanism at the solder/Au pad interface. The concentration of Au near the solder/pad interface is identified to increase and reach the solubility limit during the period of liquid state reaction. During solid state reaction, the thickening of Au-Sn compound is mainly controlled by element diffusion.

关键词： Sn-Pb solder droplet Intermetallic Aging Dissolution

A multifunctional osteogenic system of ultrasonically spray deposited bone-active coatings on plasma-activated magnesium

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Journal of Magnesium and Alloys 2023年第8期11卷 2719-2739页

作者： Hui Fang Shicheng Zhou Xiaoyun Qi Chenxi Wang yanhong tian State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Biomimetic bone-active coatings composed of inorganic nano-hydroxyapatite(i.e.,nHA)and organic silk fibroin(i.e.,SF)are layer-by-layer deposited on Mg-Zn-Ca alloy by a controllable ultrasonic spray ***,plasma activation is developed as a promising strategy to pretreat magnesium surfaces,which facilitates the direct adhesion of coatings with enhanced bonding *** this work,we engineer the nHA/SF composite coatings with excellent mechanical properties and adhesion *** optimized parameters of ultrasonic spray bring significant influence on the surface morphologies of *** by hybrid plasma of oxygen and nitrogen(i.e.,O_(2)/N_(2) plasma),the activated Mg-Zn-Ca surfaces are uniformly covered by a robust and compact nHA/SF composite coating,establishing a multifunctional system with superior corrosion resistance and biological ***,secondary oxygen plasma treatment of nHA/SF coatings(A-nHA/SF)promotes the hydrophilicity,leading to a rapid self-repair effect from surface *** improvement of anti-corrosion and self-repair provides a dependable platform for better cell adhesion,proliferation,spreading and *** favorable factors contribute to the preferable in vivo biocompatibility and the promotion of newly formed bones for the A-nHA/SF-coated Mg *** study lays important foundations for coating strategy on biomedical magnesium alloy as multifunctional osteogenic system in bioactive implantable applications.

关键词： Magnesium alloy Hydroxyapatite Silk fibroin Biocompatibility Self-repair

Surface co-hydrophilization via ammonia inorganic strategy for low-temperature Cu/SiO_(2) hybrid bonding

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Journal of Materials Science & Technology 2023年第18期149卷 161-166页

作者： Qiushi Kang Ge Li Zhengda Li yanhong tian Chenxi Wang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

*** During massive data movements in digital computing systems,several issues have emerged such as high latency,energy ineffi-ciency,and low bandwidth due to the physical separation of pro-cessor and memory units(so-called memory wall)[1-3].To miti-gate the data-movement limitations,three-dimensional(3D)chip integration becomes an optimal solution within von Neumann ar-chitecture since the dense vertical interconnections shorten the distance between chips[4,5].However,the extensively used micro solder bumps for 3D chip stacking impede the further improve-ment of interconnection pitch(<10μm).In this scenario,the Cu/SiO_(2) hybrid bonding technology came into *** to the coexistence of planarized Cu connections and SiO_(2) layers,Cu/SiO_(2) hybrid bonding is the desirable enabler of submicron ultra-dense integration(<1μm),which benefits from Cu-Cu and SiO_(2)-SiO_(2) homogeneous direct bonding replacing micro bumps and underfill[6,7].

关键词： bonding interconnection integration

Exploration of the enhanced performances for silk fibroin/sodium alginate composite coatings on biodegradable Mg-Zn-Ca alloy

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Journal of Magnesium and Alloys 2021年第5期9卷 1594-1610页

作者： Hui Fang Chenxi Wang Shicheng Zhou Ge Li yanhong tian Tadatomo Suga State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Collaborative Research Center Meisei UniversityHinoTokyo 191-8506Japan

To expand the future clinic applications of biodegradable magnesium alloy,polymer coatings with excellent biocompatibility are the keys to solve the local alkalinity and rapid hydrogen ***-organic silk fibroin provides an approach to fabricate a protective coating on biomedical Mg-Zn-Ca alloy,however,the adhesion force and mechanical properties of the coating on substrates are ought to be further improved without any chemical conversion/intermediate ***,based on VUV/O;surface activation,a hybrid of silk fibroin and sodium alginate is proposed to enhance the adhesion force and mechanical properties of the composite coatings on hydrophilic Mg-Zn-Ca alloy *** mass ratios of sodium alginate addition were investigated to achieve the optimum coating *** nanoscratch test and nanoindentation test confirmed that the adhesion force was tripled and mechanical properties index was significantly improved when the mass ratio of silk fibroin/sodium alginate was 70/30 compared to pure silk fibroin or sodium alginate ***,the corrosion rate of the coated Mg-Zn-Ca alloy was significantly delayed with the addition of sodium alginate,resulting in a reaction layer during corrosion ***,the mechanisms for both adhesion and corrosion processes were discussed in *** findings offer more possibilities for the controllable surface performance of degradable metals.

关键词： Mg-Zn-Ca alloy Silk fibroin Sodium alginate Adhesion force Mechanical property Corrosion resistance

One-step PDA coating strategy on pure Zn for blood-contacting engineering

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Journal of Materials Science & Technology 2022年第28期123卷 78-91页

作者： Xiaoyun Qi Shicheng Zhou Hui Fang Shuhan Yang Chunjin Hang yanhong tian Chenxi Wang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The mechanical performance degradation caused by pitting corrosion and the insufficient biocompatibility induced with ion release inhibit the application of Zn as the new biodegradable metallic materials for blood-contacting intervention *** work successfully coats a uniform polydopamine(PDA)layer on pure Zn via a one-step deposition process without introducing heavy metal elements or detrimental *** corrosion resistance and uniform corrosion have been performed on PDA coated Zn with corrosion products and pits reduced significantly than pure Zn during in vitro *** could be prohibited by anticoagulation performance with prothrombin time and activated partial thromboplastin time prolonged after co-incubation,and an almost 40%decrease of platelets adhesion,indicating the improved blood compatibility of coated ***,the poly(lactic-co-glycolic acid)(PLGA)is filmed on PDA coated Zn to realize a smooth double-coated structure with superior mechanical performance under stress loading to stably serve the multifunctional application,such as drug *** strategy not only represents a facile and biological friendly method for Zn surface modification but also puts forward new ideas on preparing PDA-based coatings on active biodegradable alloys,which are beneficial for better blood-contacting engineering.

关键词： Biodegradable Pure Zn Uniform corrosion Blood compatibility Doubled-coated structure

Research Progress on the Solder Joint Reliability of Electronics Using in Deep Space Exploration

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Chinese Journal of Mechanical Engineering 2023年第2期36卷 16-28页

作者： Qilong Guan Chunjin Hang Shengli Li Dan Yu Ying Ding Xiuli Wang yanhong tian State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Beijing Institute of Control Engineering Beijing 100190China

The spacecraft for deep space exploration missions will face extreme environments,including cryogenic temperature,intense radiation,wide-range temperature variations and even the combination of conditions mentioned *** environments will lead to solder joints degradation or even failure,resulting in damage to onboard *** research activities on high reliability solder joints using in extreme environments can not only reduce the use of onboard protection devices,but effectively improve the overall reliability of spacecraft,which is of great significance to the aviation *** this paper,we review the reliability research on SnPb solder alloys,Sn-based lead-free solder alloys and In-based solder alloys in extreme environments,and try to provide some suggestions for the follow-up studies,which focus on solder joint reliability under extreme environments.

关键词： Deep space exploration Extreme environments Solder joints Microstructure Electronics Reliability

Fracture Statistics Dominated by Hot-Cutting Defect and Deviation from Weibull Distribution

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Journal of Harbin Institute of Technology(New Series) 2015年第2期22卷 41-48页

作者： Chao Zeng Chunqing Wang yanhong tian Chunjin Hang Wei Liu Rong An State Key Lab of Advanced Welding and Joining Harbin Institute of Technology

This paper characterizes the rarely noticeable hot-cutting defect and statistically models the fracture governed by this new type defect. The morphology of the defect on fired ceramic is examined and quantitatively featured through comparing the fracture strength governed by intrinsic defect and hot-cutting defect. Weibull distribution is utilized to fit the observed strength data and chi-square goodness-of-fit test is conducted to analyze the deviation. Kernel density estimation is introduced to explore the underlying strength distribution dominated by hot-cutting defect. Based on the shape information from kernel density estimating,gamma and lognormal distribution are compared and the hot-cutting defect governing fracture statistics is finally confirmed by chisquare test. Results show that the newly-defined hot-cutting defect is more dangerous than the intrinsic defect and the priori Weibull distribution fails to describe the fracture statistic governed by the edge defect while the lognormal with a slightly right skewed shape fits it very well.

关键词： hot-cutting defect deviation from Weibull Kernel density estimation lognormal distribution

Recycled low-temperature direct bonding of Si/glass and glass/glass chips for detachable micro/nanofluidic devices

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Journal of Materials Science & Technology 2020年第11期42卷 156-167页

作者： Chenxi Wang Hui Fang Shicheng Zhou Xiaoyun Qi Fanfan Niu Wei Zhang yanhong tian Tadatomo Suga State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin J50001China School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyCuilin 541004China Collaborative Research Center Meisei UniversityTokyo 191-8506Japan Department of Precision Engineering School of EngineeringThe University of TokyoBunkyoTokyo 113-8656Japan

Silicon and glass are two of the most ideal materials for micro/nanofluidic devices,which have been widely used for research in multidisciplinary ***,many micro/nanofluidic devices enable only single use due to the irreversible bonding between Si/glass or glass/glass *** the silicon-and glass-based devices are fabricated to be detachable,the substrates can be reused and bonded again without repeating expensive micro/nanofabrication ***,we present a recycled direct bonding method for Si/glass and glass/glass chips based on oxygen plasma activation and low-temperature annealing *** bonding strength and void-free bonding interface are obtained after annealing at 150℃.The surfaces and the bonding interfaces are characterized to elucidate the bonding ***,immersion tests are carried out to investigate the interfacial corrosion resistance in various chemical and biological solutions as well as explore a detachable *** bonding strengths are controlled to meet the demand for micro/nanofluidic devices and the bonding interfaces can be separated in *** a result,we succeed in the experiment of bonding and detaching of glass substrates without fracturing,which is repeated for three times.

关键词： Low-temperature bonding Plasma activation Interface Corrosion Detachable

Multi-Stage Hydrocarbon Accumulation and Formation Pressure Evolution in Sinian Dengying FormationCambrian Longwangmiao Formation, Gaoshiti-Moxi Structure, Sichuan Basin

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Journal of Earth Science 2016年第5期27卷 835-845页

作者： Juan Wu Shugen Liu Guozhi Wang Yihua Zhao Wei Sun Jinming Song yanhong tian State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of Geosciences Chuanzhong Division of Southwest Oil & Gasfield Company Petro China

Sichuan Basin is a typical superimposed basin, which experienced multi-phase tectonic movements, meanwhile Sinian–Cambrian underwent complex hydrocarbon accumulation processes, causing exploration difficulties in the past 60 years. Based on the microscopic evidence of fluid inclusions, combined with basin-modelling, this paper determines stages and time of hydrocarbon accumulation, reconstructs evolution of formation pressure and dynamic processes of hydrocarbon accumulation in Sinian Dengying Formation-Cambrian Longwangmiao Formation of Gaoshiti-Moxi structure. Three stages of inclusions are detected, including a stage of yellow-yellowgreen fluorescent oil inclusions, a stage of blue fluorescent oil-gas inclusions and a stage of non-fluorescent gas inclusions, reflecting the study area has experienced a series of complex hydrocarbon accumulation processes, such as formation of paleo-oil reservoirs, cracking of crude oil, formation of paleo-gas reservoirs and adjustment to present gas reservoirs, which occurred during 219–188, 192–146 and 168–0 Ma respectively. During the period of crude oil cracking, Dengying Formation-Longwangmiao Formation showed weak overpressure to overpressure characteristics, then after adjustment of paleo-gas reservoirs to present gas reservoirs, the pressure in Dengying Formation changed into overpressure but finally reduced to normal pressure system. However, due to excellent preservation conditions, the overpressure strength in Longwangmiao Formation only slightly decreased and was still kept to this day.

关键词： Sichuan Basin Gaoshiti-Moxi structure Sinian-Cambrian hydrocarbon accumulation,formation pressure fluid inclusion.