Atomized Lead Free Solder Alloys For Solder Paste Product For Electronic Application

Bakir, Mohammed Luay (2012) Atomized Lead Free Solder Alloys For Solder Paste Product For Electronic Application. Masters thesis, Universiti Sains Malaysia.

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Properties of Sn-9Zn and Bi-48.8In-19.6Sn solder alloys have been investigated along with Sn-40Pb as a reference. The solder alloys where characterized (density, XRD, SEM, CTE and DSC) before the atomization process. The characterized solder alloys are then gas atomized at a pressure of 0.4 MPa and superheat temperature of 20% above their respective liquidus temperature obtained from the DSC analysis. Solder powders are then sieved and characterized using SEM and particle size analyzer. The characterized powders of size +75-150 μm are then mixed with zinc chloride flux at different metal to flux ratios (90:10, 80:20, 70:30, and 60:40). The wetting properties (spreading and contact angle), interfacial reactions and mechanical property (shear test) of the solder pastes are then studied. The Sn-40Pb solder paste demonstrates the highest spreading and lowest contact angle compared to Sn-9Zn and Bi-48.8In-19.6Sn. At the solder/substrate interface, the intermetallic compound Cu6Sn5 was formed for both Sn-40Pb and Bi-48.8In-19.6Sn regardless of metal content and Sn-Cu-Zn intermetallic compound is formed at the Sn-9Zn (90 wt%)/Cu interface. The highest joint shear strength was achieved by Sn-9Zn (90 wt%) at a value of 45.3 MPa. The shear strength increased as the metal content increases for the Sn-40Pb and Bi-48.8In-19.6Sn solder alloys. The shear strength of Sn-40Pb (90 wt%) is higher than the shear strength of Sn-40Pb (80 wt%) and the same goes for Bi-48.8In-19.6Sn solder alloy where the shear strength of Bi-48.8In-19.6Sn (90 wt%) is higher than the shear strength of Bi-48.8In-19.6Sn (80 wt%).

Item Type: Thesis (Masters)
Subjects: T Technology > TN Mining Engineering. Metallurgy > TN1-997 Mining engineering. Metallurgy
Divisions: Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Bahan & Sumber Mineral (School of Material & Mineral Resource Engineering) > Thesis
Depositing User: HJ Hazwani Jamaluddin
Date Deposited: 24 Sep 2019 02:56
Last Modified: 24 Sep 2019 02:56

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