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    • 3. 发明授权
    • Lead-free solder
    • 无铅焊料
    • US06231691B1
    • 2001-05-15
    • US08796471
    • 1997-02-10
    • Iver E. AndersonRobert L. Terpstra
    • Iver E. AndersonRobert L. Terpstra
    • C22C700
    • B23K35/262
    • A Sn—Ag—Cu eutectic alloy is modified with one or more low level and low cost alloy additions to enhance high temperature microstructural stability and thermal-mechanical fatigue strength without decreasing solderability. Purposeful fourth or fifth element additions in the collective amount not exceeding about 1 weight % (wt. %) are added to Sn—Ag—Cu eutectic solder alloy based on the ternary eutectic Sn—4.7%Ag—1.7%Cu (wt. %) and are selected from the group consisting essentially of Ni, Fe, and like-acting elements as modifiers of the intermetallic interface between the solder and substrate to improve high temperature solder joint microstructural stability and solder joint thermal-mechanical fatigue strength.
    • Sn-Ag-Cu共晶合金用一种或多种低水平和低成本的合金添加剂进行改性,以提高高温微结构稳定性和热机械疲劳强度,而不降低可焊性。 基于三元共晶Sn-4.7%Ag-1.7%Cu(重量%),Sn-Ag-Cu共晶焊料合金中加入总量不超过约1重量%(重量%)的有目的的第四或第五元素添加量 ),并且选自基本上由Ni,Fe和类似作用元素组成的组,作为焊料和衬底之间的金属间界面的改性剂,以改善高温焊点微结构稳定性和焊点热 - 机械疲劳强度。