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    • 8. 发明授权
    • Lead-free solder alloy and solder reflow process
    • 无铅焊料合金和回流焊工艺
    • US06767411B2
    • 2004-07-27
    • US10099861
    • 2002-03-15
    • Shing YehBradley H. CarterCurtis W. Melcher
    • Shing YehBradley H. CarterCurtis W. Melcher
    • B23K35363
    • B23K35/262
    • A lead-free solder alloy consisting essentially of, by weight, 3.0% to 3.5% silver, greater than 1% to about 15% copper, the balance tin and incidental impurities, and having an effective melting range of about 215° C. to about 222° C. The solder alloy is noneutectic, and therefore characterized by solidus and liquidus temperatures, the former being in a range of about 215° C. to about 218° C., while the latter is about 290° C. or more. However, the melting mechanism exhibited by the alloy is such that the alloy is substantially all melted and does not exhibit a “mushy zone” above the effective melting range, enabling the alloy to behave similarly to the SnAgCu eutectic alloy.
    • 一种无铅焊料合金,其基本上由重量比为3.0%至3.5%的银,大于1%至约15%的铜,余量为锡和附带杂质,并且具有约215℃的有效熔融范围, 约222℃。焊料合金是共晶的,因此以固相和液相线温度为特征,前者在约215℃至约218℃的范围内,而后者为约290℃或更高 。 然而,合金显示的熔融机理使得合金基本上全部熔化,并且在有效熔融范围之上不显示“糊状区域”,使合金的性能与SnAgCu共晶合金类似。