Effect of Addition of Al to Sn-Zn Solder Alloys

Gupta, Kapil Kumar and Bhattamishra, Smarak Dash (2015) Effect of Addition of Al to Sn-Zn Solder Alloys. BTech thesis.



Conventional solders consist of Lead, that was found to be toxic and carcinogenic. Hence, restrictions were put on its use by the industrially developed nations. To counter the use of Lead, active research was pursued into the development of Lead-free solders. In our project, we fabricated alloys of composition 3:15:82, 7:43:50 and 10:80:10 (in terms of Aluminium, Zinc and Tin respectively), under furnace cooled and air-cooled conditions. The use of Aluminium was made so as to increase the resistance of the solder to atmospheric corrosion, and also to improve the wettability of the samples. Optical micrographs were obtained for each sample so as to analyze their microstructures. For a deeper understanding, SEM images of each sample were obtained, and EDX analysis was performed side-by-side so as to understand the elemental composition of different phases present in the sample. DSC and TG tests were conducted to determine the melting point of the solder alloy, and the weight gain in the alloy on oxidation respectively. The wettability of each sample was also analyzed. We recorded and plotted down the trends in each case. We then tried to evaluate the most effective solder composition on the basis of the above tests. The near-eutectic composition was considered so as to avoid the formation of a pasty phase that will cause disruption in electrical work.

Item Type:Thesis (BTech)
Uncontrolled Keywords:Soldering, Tin/lead solders, lead free solders, Al – Sn – Zn ternary system, phase diagram,Lead Poisoning, Wettability, TG-DSC. FESEM & EDX, Corrosion resistance, melting point, Air Cooled, Furnace Cooled, Oxidation resistance
Subjects:Engineering and Technology > Metallurgical and Materials Science > Mechanical Alloying
Divisions: Engineering and Technology > Department of Metallurgical and Materials Engineering
ID Code:7016
Deposited By:Mr. Sanat Kumar Behera
Deposited On:06 Mar 2016 15:29
Last Modified:06 Mar 2016 15:29
Supervisor(s):Alam, S N

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