Synthesis and sintering properties of composite nano-Ag–Sn slurry

Abstract

This topic prepared a composite nano-silver–tin slurry. According to the boiling point of the dispersant, 300 °C is determined as the sintering temperature. As the amount of tin added increases, the shear strength of Ag–Sn slurry gradually increases. When the amount of tin added is 1/20, the sintering strength reaches the maximum of 50 MPa. The increase in the shear strength is due to the strengthening of the second phase. When the amount of tin added exceeds 1/20, the sintering strength drops sharply, mainly due to the overgrowth of Ag3Sn, the product of the reaction of silver and tin. The porosity was measured accurately by Photoshop software. The porosities of pure silver, 5% tin, and 10% tin samples are 21.8%, 16.8%, and 12.5%, respectively. The Brinell hardness of the samples with pure silver and 5% tin is 20.60N/mm2 and 97.79N/mm2, respectively. After adding a small amount of nano-tin, due to its increased density, the porosity decreases, and the hardness value increases. Compared with nano-silver slurry, the sintering performance of nano-silver–tin slurry is improved. Therefore, it provides a certain reference for the preparation of nano-silver slurry.