期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
感应自加热重熔无铅焊料凸台的剪切失效模式
1
作者 李明雨 徐鸿博 +1 位作者 Jong-Myung Kim Hong-Bae Kim 《电子与封装》 2006年第10期17-21,38,共6页
通过两次高频感应重熔制备了Cu焊盘上S n3.5Ag焊料和Sn3.0Ag0.5Cu焊料凸台,并进行了120℃下的老化试验以及老化试件的剪切强度试验,分析了不同老化时间下两种无铅焊料凸台的剪切断裂模式。焊料凸台的剪切载荷-位移曲线的特征以及对... 通过两次高频感应重熔制备了Cu焊盘上S n3.5Ag焊料和Sn3.0Ag0.5Cu焊料凸台,并进行了120℃下的老化试验以及老化试件的剪切强度试验,分析了不同老化时间下两种无铅焊料凸台的剪切断裂模式。焊料凸台的剪切载荷-位移曲线的特征以及对焊料凸台剪切断口的扫描电镜形貌分析结果表明,不同老化时间下无铅焊料凸台的剪切断裂表现为塑性、韧性和脆性三种断裂模式。对凸台焊料合金的组织以及界面观察结果表明,随老化时间不断生长的脆性金属间化合物层以及焊料组织粗大是致使断裂失效模式转变的根本原因。 展开更多
关键词 感应自发热重熔 无铅焊料 老化 剪切断裂
下载PDF
Antiproliferative and apoptosis-inducing potential of 3β-hydroxy-△5-steroidal congeners purified from the soft coral Dendronephthya putteri 被引量:1
2
作者 Thilina U. JAYAWARDENA Won Woo LEE +6 位作者 I. P. Shanura FERNANDO K. K. Asanka SANJEEWA Lei WANG Tee Gee LEE Young Jin PARK Chang-ik KO You-Jin JEON 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2019年第4期1382-1392,共11页
The exploration and identification of antiproliferative phytochemicals have received increased attention in medicinal chemistry. In particular, research focused on the toxicology of marine natural products has increas... The exploration and identification of antiproliferative phytochemicals have received increased attention in medicinal chemistry. In particular, research focused on the toxicology of marine natural products has increased in recent years. Terpenoids, among many secondary metabolites, have been demonstrated to act as effective anticancer agents. Soft corals, a group of marine invertebrates, produce a variety of terpenoids with biofunctional properties. The current study presents the extraction, purification, and identification of sterol congeners from the soft coral Dendronephthya putteri. The method involves 50% chloroform-methanol extraction, polar column fractionation, and analysis through GC-MSn. Dose-dependent antiproliferative activity was observed within the sterol-rich fraction (DPCMH 2-4), which consisted of 3β-hydroxy-Δ5-steroidal congeners. This fraction inhibited the growth of HL-60 and MCF-7 cells with IC50 values of 25.27±1.43 and 22.81±0.15 μg/mL, respectively. Apoptotic body formation, DNA damage, cell cycle arrest, and apoptotic cell signaling pathway activation were also observed, reinforcing the dose-dependent antiproliferative and apoptosis-inducing activity of 3β-hydroxy-Δ5-steroidal congeners. To our knowledge, this is the first report of anticancer agent identification from the soft coral D. putteri. Based on the observations, these steroidal congeners are promising candidates for the development of anticancer drugs. 展开更多
关键词 Dendronephthya putteri soft CORAL ANTIPROLIFERATIVE agent HL-60 MCF-7 apoptosis steroidal CONGENERS
下载PDF
Sn3.5Ag0.75Cu钎料与Au/Ni/Cu焊盘接头老化过程中IMC组织的演变
3
作者 秦毅 李明雨 +1 位作者 KIM Jongmyung KIM Daewon 《现代表面贴装资讯》 2007年第2期42-44,共3页
通过SEM(Scanning Electron Microscope)背散射照片和EDX(Energy Dispersive X-Ray Spectroscopy)成分分析研究了无铅钎料Sn3.5Ag0.75Cu与Au/Ni/Cu焊盘接头在老化过程中其界面金属间化合物(IMC)的生长演变过程;在175℃温度... 通过SEM(Scanning Electron Microscope)背散射照片和EDX(Energy Dispersive X-Ray Spectroscopy)成分分析研究了无铅钎料Sn3.5Ag0.75Cu与Au/Ni/Cu焊盘接头在老化过程中其界面金属间化合物(IMC)的生长演变过程;在175℃温度条件下老化72h后发现Cu可以穿过Ni层参与形成界面金属间化合物(Au,Ni,Cu)Sn4和(Au,Ni,Cu)6Sn5;基于金属间化合物生长动力学理论计自得该焊点结构中AuSn4生长的活化能为53.78KJ/mol。 展开更多
关键词 金属间化合物 无铅钎料 活化能
下载PDF
Failure Modes of Lead Free Solder Bumps Formed by Induction Spontaneous Heating Reflow
4
作者 Mingyu LI Hongbo XU +1 位作者 Jongmyung KIM Hongbae KIM 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2007年第1期61-67,共7页
The shear failure modes and respective failure mechanism of Sn3.5Ag and Sn3.0Ag0.5Cu lead-free solder bumping on Au/Ni/Cu metallization formed by induction spontaneous heating reflow process have been investigated thr... The shear failure modes and respective failure mechanism of Sn3.5Ag and Sn3.0Ag0.5Cu lead-free solder bumping on Au/Ni/Cu metallization formed by induction spontaneous heating reflow process have been investigated through the shear test after aging at 120℃ for 0, 1, 4, 9 and 16 d. Different typical shear failure behaviors have been found in the loading curves (shear force vs displacement). From the results of interracial morphology analysis of the fracture surfaces and cross-sections, two main typical failure modes have been identified. The probabilities of the failure modes occurrence are inconsistent when the joints were aged for different times. The evolution of the brittle NiaSn4 and Cu-Ni-Au-Sn layers and the grains coarsening of the solder bulk are the basic reasons for the change of shear failure modes. 展开更多
关键词 Induction spontaneous heating reflow Lead free solder Shear test Failure mode
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部