Multi-layer circuit substrates and electrical assemblies having
conductive composition connectors
    8.
    发明授权
    Multi-layer circuit substrates and electrical assemblies having conductive composition connectors 有权
    具有导电组合物连接器的多层电路基板和电气组件

    公开(公告)号:US6054761A

    公开(公告)日:2000-04-25

    申请号:US203126

    申请日:1998-12-01

    摘要: Printed circuit substrates and electrical assemblies including a conductive composition are disclosed. The printed circuit substrate and the electrical assembly embodiments comprise a first conducting region and a second conducting region. A dielectric layer is disposed between the first and second conducting regions. An aperture is disposed in the dielectric layer and a via structure including the conductive composition is disposed in the aperture. The conductive composition is preferably in a cured state and electrically communicates with the first and second conducting regions. In preferred embodiments, the conductive composition comprises conductive particles in an amount of at least about 75 wt. % based on the weight of the composition. At least 50% by weight of the conductive particles have melting points of less than about 400.degree. C. The composition further includes a carrier including an epoxy-functional resin in an amount of at least about 50 wt. % based on the weight of the carrier, and a fluxing agent in an amount of at least about 0.1 wt % based on the weight of the carrier. The epoxy functional resin can have a viscosity of less than about 1000 centipoise at 25.degree. C.

    摘要翻译: 公开了印刷电路基板和包括导电组合物的电气组件。 印刷电路基板和电组件实施例包括第一导电区域和第二导电区域。 电介质层设置在第一和第二导电区域之间。 在电介质层中设置孔,并且包括导电组合物的通孔结构设置在孔中。 导电组合物优选处于固化状态并与第一和第二导电区域电连通。 在优选的实施方案中,导电组合物包含至少约75wt。 基于组合物的重量%。 至少50重量%的导电颗粒具有小于约400℃的熔点。该组合物还包括载体,其包含至少约50重量%的量的环氧官能树脂。 基于载体的重量,以及基于载体重量的至少约0.1重量%的助熔剂。 环氧官能树脂在25℃下的粘度可以小于约1000厘泊

    Article comprising a Pb-free solder having improved mechanical properties
    9.
    发明授权
    Article comprising a Pb-free solder having improved mechanical properties 失效
    制品包括具有改善的机械性能的无铅焊料

    公开(公告)号:US5762866A

    公开(公告)日:1998-06-09

    申请号:US502941

    申请日:1995-07-17

    IPC分类号: B23K35/26 C22C13/00 C22C13/02

    CPC分类号: C22C13/00 B23K35/262

    摘要: A high-strength Pb-free solder alloy, based on the Sn--Ag--Zn system, is disclosed. The Pb-free solder alloy contains, in weight percent, 0.2-0.6% Zn, 1-6% Ag, one or both 0.2-0.6% In and 0.2-0.6% Bi, and the balance Sn. The addition of Zn significantly improves the mechanical strength and creep resistance of e.g., Sn--3.5% Ag eutectic solder while maintaining substantially the same level of ductility. The increase in strength is as much as 48% over that of the Sn--3.5% Ag alloy. This strengthening from the Zn additions is attributed to a uniform solidification structure and a substantial refinement of the precipitates in the alloy. Essentially all of the added Zn resides in the more corrosion-resistant, Ag-based, intermetallic precipitates, leaving the Sn-rich matrix primarily free of Zn in solid solution.

    摘要翻译: 公开了一种基于Sn-Ag-Zn系统的高强度无铅焊料合金。 无铅焊料合金以重量百分比含有0.2-0.6%的Zn,1-6%的Ag,一种或两种为0.2-0.6%的In和0.2-0.6%的Bi,余量为Sn。 Zn的添加显着提高例如Sn-3.5%Ag共晶焊料的机械强度和抗蠕变性,同时保持基本上相同的延展性水平。 强度比Sn-3.5%Ag合金高出48%。 Zn添加物的这种强化归因于合金中的均匀凝固结构和沉淀物的显着改进。 基本上所有添加的Zn都位于更耐腐蚀的Ag基金属间析出物中,使富含Sn的基体在固溶体中基本上不含Zn。