Electronics Forum | Thu Oct 21 05:42:15 EDT 2010 | jacki
Dear All Does anyone know about the low melting point solder paste which should be Copper Base? Usually the Copper base solder has 227'C of melting point.
Electronics Forum | Mon Nov 01 11:43:45 EDT 2010 | patrickbruneel
Jacki, Lead-free Cu based alloys with melting point below 210C don’t exist.
Electronics Forum | Mon Nov 01 04:40:29 EDT 2010 | jacki
Hi Mark thanks and useful. However, I couldn't find the Copper base solder paste which melting point is lower than 210'C.
Electronics Forum | Wed Aug 23 08:55:39 EDT 2000 | Dave F
Dr. Lee: Taking a tangent on your response ... When talking about alternate solders. Bismuth forms an alloy with lead with a melting point of 93�C. Are there special conditions that cause this alloy to form? Or does the alloy form commonly when
Electronics Forum | Tue Aug 22 15:34:55 EDT 2000 | Dr. Ning-Cheng Lee
An example of very low melting point Pb-free solder is 58Bi/42Sn. Different versions of this alloys have been tried, such as doping with various additives, in order to enhance the reliability further. Yes, Bi is one element which promises low mp for
Electronics Forum | Wed Aug 23 17:15:25 EDT 2000 | Dr. Ning-Cheng Lee
The ternary SnPbBi phase does form commonly when Pb and Bi are combined. No special condition required. Presence of this phase jeopardizes the reliability for applications involving temperature near 96C. Using low temperature solders means a lower s
Electronics Forum | Wed Apr 26 12:38:33 EDT 2006 | TMC
I would suggest you do the following: get a sample / scrap board that you will be reflowing, attach thermocouples at various locations on the board, send the board to APS or whomever. Ask them to run a profile based on your solder pastes manufactur
Electronics Forum | Sat Jan 19 04:50:48 EST 2019 | tirthkar8980
why two high melting temperature metals are getting melt earlier or mean at very low temperature after mixing. Ex :- Tin (sn) - 231 C melting point lead (pb) - 327 C melting point But Sn/Pb - 63/37 melting temperature is 183 C
Electronics Forum | Mon Jun 15 16:51:05 EDT 2020 | emeto
Tin/Lead has 183C melting point and probably around 220 peak temperature at reflow. Tin has 232C melting point. I would assume that based on this information you would understand why intermetallic joint is questionable. Go to any flat finish. HASL wi
Electronics Forum | Thu May 13 16:55:51 EDT 2021 | emeto
With Pb-Free HASL you can't use Pb process for sure as the melting point of tin is so much higher than the lead paste process. SAC305 is the most popular compound, unless your assembly requires something else for a specific reason.
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