【摘 要】
：
Today,a growing number of third-generation semiconductor-based power devices are used in products that can continuously operate at high temperatures for extende
【机 构】
：
State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,150001,Ch
论文部分内容阅读
Today,a growing number of third-generation semiconductor-based power devices are used in products that can continuously operate at high temperatures for extended periods of time.Hence,traditional tin-lead and lead-free solders are no longer suitable for modern electronic packaging.A common method is to apply Ag paste for bare Cu-Cu joints under an inert or reductive atmosphere.In this study,the citrate-coated nanosized Ag paste was utilized to generate robust bare Cu-Cu joints under atmospheric conditions.The average size of citrate-coated Ag particles was approximately 4.76 nm after being cleaned by deionized water and acetone.The effects of process parameters,such as cleaning,joining temperature,holding time,and joining pressure,on the mechanical prop-erties of the bare Cu-Cu joints were thoroughly investigated.Increasing washing and joining temperatures resulted in a shear strength increase of up to 28.2 MPa at a joining temperature of 260 ℃ after seven washes.In addition,a holding time of 30 min and a joining pressure of 1 MPa were selected as optimal process conditions for the application of citrate-coated nanosized Ag paste onto bare Cu-Cu joints.The newly developed Cu-Cu joints showed excellent thermal stability at 150 ℃ using the citrate-coated nanosized Ag paste.After long-term aging,the joints exhibited stability at 250 ℃ for 144 h,indicating a good high-temperature reliability for three-dimensional integrated circuits (3D ICs) fabricated under atmospheric conditions.
其他文献
阐述了2020年诺贝尔生理学或医学奖的3位科学家发现丙肝病毒的过程,以及能治愈丙肝的第三代特效药索磷布韦-维帕他韦作为世界卫生组织2018年推荐的丙肝首选治疗方案对于实现“2030全球丙肝战略目标”的重要性,旨在提升全社会共同努力抗击丙肝的意识。
Fe2O3 electrode materials exhibit excellent electrochemical performance in electrochemical energy storage sys-tem.However,its poor electrical conductivity limit
The high performance of as-cast Mg-RE alloys is always related to their high RE additions.However,RE elements can be readily segregated in Mg alloys and the seg
学生通过观看视频和调查校园生物多样性价值获得感性认识,通过讨论生物多样性的保护措施形成可持续发展观念,通过校园改造方案的评估升华生命观念,通过联系自身养成“环境保
The application of magnesium hydride (MgH2) is limited due to the high reaction temperature and slow kinetics during dehydrogenation.In order to ameliorate the
The microstructure features,martensitic transformation behavior and mechanical/functional properties of Ti-V-Al alloy were tailored by changing rare element Y c
生物学概念是生物学课程的基本组成,包括了对生命基本现象、规律、理论等的理解和解释。形成生物学概念一般需要进行分析、比较、归纳、演绎、综合、抽象和概括等科学思维的过程和方法。因此,科学思维方法是形成概念的重要方法。但是,对学生科学思维的培养,一节课所能应用的方法是有限的。
The amorphous Ti-Ni-Hf thin films with the specific compositions were prepared from single Ti-Ni-Hf alloy target by adjusting processing parameters of direct cu
《中国高考评价体系》提出高考考查内容包括核心价值、学科素养、关键能力和必备知识,批判性思维既属于学科素养中的科学思维,也属于关键能力中的思维认知能力群,是高考考查的重点。《普通高中生物学课程标准(2017年版)》(以下简称《课程课标》)凝练了生物学学科核心素养和制定了学业质量标准,多处体现了对批判性思维的培养与评价,是教学中的重点。
In this work,silicon ink composing of silicon powder and zinc oxide solution was formulated and spin-coated on quartz and n/p-Si substrates followed by drying t