Wettability of solder can be defined as the ability of the molten solder to spread over on a substrate during the reflow process . For the reflow process, the heating temperature at a certain condition, only a good wettability to the surface of the base material to form good wet spreading joints, namely which is to form solder joints. And the solder joints bear the entire electronic device the role of mechanical support and electrical connections; thus the solder joints directly determine the performance of electronic products. For traditional SnPb solder, due to the existence of Pb, the solder alloy owns better wettability. But for lead-free solders, the wettability may be dropped obviously due to the replacement of Pb. In order to improve the wettability of solder, the addition of alloying element is a hot research investigator. Generally, there are many methods to measure the wettability, but the wetting balance method and spreading method are considered the relatively versatile methods.
Wettability of solder can be defined as the ability of the molten solder to spread over on a substrate during the reflow process . For the reflow process, the heating temperature at a certain condition, only a good wettability to the surface of the base material to form good wet spreading joints, namely which is to form solder joints. And the solder joints bear the entire electronic device the role of mechanical support and electrical connections; thus the solder joints directly determine the performance of electronic products. For traditional SnPb solder, due to the existence of Pb, the solder alloy owns better wettability. But for lead-free solders, the wettability may be dropped obviously due to the replacement of Pb. In order to improve the wettability of solder, the addition of alloying element is a hot research investigator. Generally, there are many methods to measure the wettability, but the wetting balance method and spreading method are considered the relatively versatile methods.
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