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Who can calculate the meltingpoint for me of a mixture of metals with 40% Sn and 60% Pb?
Euhh, I have no clue what that means :) The substance I am asking for is soudage (a complete foreign word to me, I had to look it up in a dictionary)Originally posted by Bystander
From first principles? Or, did you just want a value for the Sn-Pb eutectic?
Originally posted by Monique
Ah! Thank you Bystander :)
But why is the eutectic temperature so much lower than the melting temperatures of the individual metals,
and why is my little calculation so far off?
Pb mp = 372.5
Sn mp = 231.9
40/60 Sn/Pb eutectic temp 183-238
The melting point of an alloy composed of 40% Sn and 60% Pb is approximately 183°C (361°F). This is a eutectic alloy, meaning it has the lowest melting point of all possible compositions within the Sn-Pb system.
The melting point of this alloy is lower than both pure Sn (231.9°C or 449.4°F) and pure Pb (327.5°C or 621.5°F). This is due to the eutectic composition, which has a lower melting point than the individual components.
The main factors that affect the melting point of this alloy are the composition (percentage of Sn and Pb) and any impurities present. The presence of impurities can alter the melting point of the alloy, making it higher or lower than the expected eutectic point.
The melting point of this alloy is fixed at the eutectic point (183°C or 361°F) for the given composition of 40% Sn and 60% Pb. However, by changing the composition of the alloy, the melting point can be altered. For example, increasing the percentage of Sn will decrease the melting point, while increasing the percentage of Pb will increase the melting point.
The melting point of this alloy is important to know for various industrial applications, such as soldering and casting. It also helps in understanding the properties of the alloy, including its workability and strength at different temperatures. Furthermore, knowing the melting point can aid in the proper handling and use of the alloy to ensure its quality and effectiveness in different processes.