The use of formic acid vapor in soldering is growing. In the presence of SnAgCu powder, used as a bonding material to replace Pb-containing alloys, undesired deposits are observed. To understand this phenomenon, the mass change of a sample of alloys was investigated between 40 and 260 1C and the evolved gas was analyzed. In the quest to identify the unwanted deposits, a new strategy was researched and developed to increase the quantity of the produced deposit and to obtain it on a target surface for further studies. Unexpectedly, crystals were produced. The growth process of the crystals was optimized to reach crystal structures at nearly 1 mm in height. Unusual shapes were detected.
Formation of tin-based crystals from a SnAgCu alloy under formic acid vapor
Fosca Conti
;
2018
Abstract
The use of formic acid vapor in soldering is growing. In the presence of SnAgCu powder, used as a bonding material to replace Pb-containing alloys, undesired deposits are observed. To understand this phenomenon, the mass change of a sample of alloys was investigated between 40 and 260 1C and the evolved gas was analyzed. In the quest to identify the unwanted deposits, a new strategy was researched and developed to increase the quantity of the produced deposit and to obtain it on a target surface for further studies. Unexpectedly, crystals were produced. The growth process of the crystals was optimized to reach crystal structures at nearly 1 mm in height. Unusual shapes were detected.Pubblicazioni consigliate
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