Smt Reflow Soldering

May 5th, 2015
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For example, 63Sn/37Pb solder alloy is a Eutectic composition with a single melting temperature of 183℃. There are also other Sn/Pb solder with different mixture ratio, while they are not eutectic. Non-eutectic mixtures will display solidification of one component of the mixture before the other. 60Sn/40Pb solder alloy has a melting range of 183s-188l (s: completely solidus/freeze temperature; l: completely liquidus /melt temperature. In this temperature range, the metal particles in the alloy display to be partly solidus and partly liquidus). [1]

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Smt Reflow SolderingIssues with Solder Alloys, Solder Pastes and Lead-free Solders1. Solder Alloy Considerations on selecting solder alloy should be based on the following criteria [1]: 1) The melting range of solder alloy, considering application temperature; 2) The mechanic properties of solder alloy, considering to application conditions; 3) Metallurgic compatibility, considering leaching phenomenon and possible intermetallic compound; 4) Compatibility with application environment;5) Wetting performance on specific substrate;6) Eutectic or non-eutectic.Melting points of common solder metal elements [1]: Eutectic Alloy is a mixture of different metal ingredients with a specific compound ratio, so that the alloy has a single chemical composition that solidifies / liquefies at a single temperature, which is lower that the solidifying / liquefying temperature of any other kinds of composition made up with the same ingredients.Melting range of common solder alloy [1]: For example, 63Sn/37Pb solder alloy is a Eutectic composition with a single melting temperature of 183. There are also other Sn/Pb solder with different mixture ratio, while they are not eutectic. Non-eutectic mixtures will display solidification of one component of the mixture before the other. 60Sn/40Pb solder alloy has a melting range of 183s-188l (s: completely solidus/freeze temperature; l: completely liquidus /melt temperature. In this temperature range, the metal particles in the a

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