随着电子设备精巧化的提升,采用电镀铜填充盲孔的高密度互连(High Density Interconnector,HDI)印制电路板得到广泛应用,但与此同时盲孔带来的可靠性问题也日益凸显。针对电镀铜填充的三阶盲孔叠孔结构,采用仿真手段,探究了板材热膨胀...随着电子设备精巧化的提升,采用电镀铜填充盲孔的高密度互连(High Density Interconnector,HDI)印制电路板得到广泛应用,但与此同时盲孔带来的可靠性问题也日益凸显。针对电镀铜填充的三阶盲孔叠孔结构,采用仿真手段,探究了板材热膨胀系数、叠孔结构、焊盘宽度、板材厚度对盲孔镀铜层热应力分布的影响规律。结果表明盲孔与焊盘连接的拐角处存在着明显的应力集中现象,板材热膨胀系数和叠构对孔铜热应力分布影响显著,焊盘宽度影响不大,板材厚度的增加会导致铜的热应力分布增大。展开更多
Ni−Co−C alloy coatings with exceptional properties were fabricated via electrodeposition using an ammonium oxalate−ammonium citrate system.The optimized coatings exhibited dense crystallization with a distinct granula...Ni−Co−C alloy coatings with exceptional properties were fabricated via electrodeposition using an ammonium oxalate−ammonium citrate system.The optimized coatings exhibited dense crystallization with a distinct granular surface,where large particles were covered with nanoscale clusters.Additionally,C atoms primarily existed within the coatings as a solid solution,maintaining the FCC structures.Compared to binary Ni−Co coatings,the Ni−Co−C alloy coatings exhibited significantly improved hardness,wear resistance,and adhesion strength,which could be attributed to the potential strengthening effect of the C atoms.Specifically,the introduction of C atoms optimized the local charge density and electron distribution in the alloy,transforming local weak ionic bonds into strong covalent interactions,thereby enhancing the bonding capability between the corresponding atoms in the NiCo bulk.展开更多
文摘随着电子设备精巧化的提升,采用电镀铜填充盲孔的高密度互连(High Density Interconnector,HDI)印制电路板得到广泛应用,但与此同时盲孔带来的可靠性问题也日益凸显。针对电镀铜填充的三阶盲孔叠孔结构,采用仿真手段,探究了板材热膨胀系数、叠孔结构、焊盘宽度、板材厚度对盲孔镀铜层热应力分布的影响规律。结果表明盲孔与焊盘连接的拐角处存在着明显的应力集中现象,板材热膨胀系数和叠构对孔铜热应力分布影响显著,焊盘宽度影响不大,板材厚度的增加会导致铜的热应力分布增大。
基金supported by the National Natural Science Foundation of China(Nos.52274320,52074053)。
文摘Ni−Co−C alloy coatings with exceptional properties were fabricated via electrodeposition using an ammonium oxalate−ammonium citrate system.The optimized coatings exhibited dense crystallization with a distinct granular surface,where large particles were covered with nanoscale clusters.Additionally,C atoms primarily existed within the coatings as a solid solution,maintaining the FCC structures.Compared to binary Ni−Co coatings,the Ni−Co−C alloy coatings exhibited significantly improved hardness,wear resistance,and adhesion strength,which could be attributed to the potential strengthening effect of the C atoms.Specifically,the introduction of C atoms optimized the local charge density and electron distribution in the alloy,transforming local weak ionic bonds into strong covalent interactions,thereby enhancing the bonding capability between the corresponding atoms in the NiCo bulk.
