Effect study on the properties of 3D printing Sn9Zn alloy
                                                                 HUANG Wei1, SUN Xiaoyan2, WU Shilin3
（1.Department of Mechanical Engineering, Qinghai Communications Technical College, Xining 810028, China;2. Department of Mechanical Engineering, Yantai Engineering & Technology College, Yantai 264006,China;3.Institute of Robotics, Beihang University, Beijing 100191, China）

Abstract: Aiming at the problem that SnZn series alloy is easy to be oxidized and corroded, and application of spray deposition 3D printing technology in leadfree solder, in order to obtain leadfree solder with high quality, stable performance and low cost, the conventional induction melting and spray deposition 3D printing experiments were conducted on Sn9Zn alloy. The mechanical properties and weldability of 3D printing Sn9Zn alloy and induction melting Sn9Zn alloy were compared and analyzed. The results indicate that the tensile strengths of Sn9Zn alloys by induction melting and 3D printing are 43.3 MPa and 42.7 MPa, the yield strengths are 26.3 MPa and 25.7 MPa, the elongations are 27.3% and 27.7%, and the maximum wetting forces are 3.37 mN and 3.36 mN, the appropriate 3D printing process parameters can get excellent mechanical properties and weldability of Sn9Zn alloy.

Key words: Sn9Zn alloy; induction smelting; 3D printing; mechanical property; weldability