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    • 10. 发明申请
    • SOLDERING MATERIAL AND ELECTRONIC COMPONENT ASSEMBLY
    • 焊接材料和电子元器件组件
    • US20110120769A1
    • 2011-05-26
    • US12999411
    • 2010-04-19
    • Shigeaki SakataniAkio FurusawaKenichiro SuetsuguTaichi Nakamura
    • Shigeaki SakataniAkio FurusawaKenichiro SuetsuguTaichi Nakamura
    • H01R4/00B23K31/02
    • H05K3/3463B23K35/262B23K2101/36B32B15/01C22C13/00H05K3/3442H05K2201/10992Y02P70/613
    • A lead-free solder material is provided, which shows a high thermal fatigue resistance and is able to effectively reduce occurrence of connection failure that would cause a function of a product to stop.A solder material comprises 1.0-4.0% by weight of Ag, 4.0-6.0% by weight of In, 0.1-1.0% by weight of Bi, 1% by weight or less (excluding 0% by weight) of a sum of one or more elements selected from the group consisting of Cu, Ni, Co, Fe and Sb, and a remainder of Sn. When a copper-containing electrode part (3a) of an electronic component (3) is connected to a copper-containing electrode land (1a) of a substrate (1) by using this solder material, a part (5b) having an excellent stress relaxation property can be formed in the solder-connecting part and a Cu—Sn intermetallic compound (5a) can be rapidly grown from the electrode land (1a) and the electrode part (3a) to form a strong blocking structure. Thus, even in a severe temperature environment, cleavage can be prevented from generating and extending, a high thermal fatigue resistance can be attained, and occurrence of connection failure can be reduced.
    • 提供了一种无铅焊料,其显示出高耐热疲劳性,并且能够有效地减少导致产品功能停止的连接故障的发生。 焊料材料包含1.0-4.0重量%的Ag,4.0-6.0重量%的In,0.1-1.0重量%的Bi,1重量%以下(不包括0重量%)的1个或 选自由Cu,Ni,Co,Fe和Sb组成的组中的更多元素,以及Sn的剩余部分。 当使用该焊料将电子部件(3)的含铜电极部(3a)与基板(1)的含铜电极焊盘(1a)连接时,具有优异应力的部分(5b) 可以在焊料连接部中形成松弛性,并且可以从电极接合区(1a)和电极部(3a)迅速地生长Cu-Sn金属间化合物(5a),形成强阻挡结构。 因此,即使在严酷的温度环境下,也可以防止产生和延伸的裂纹,可以获得高耐热疲劳性,并且可以降低连接故障的发生。